| Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] | Period [Axis] |
|---|
2016-01-01 - 2016-12-31 |
|---|
Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract] | |
Obligations and Funded Status at End of Year | Obligations and Funded Status at End of Year | | | | | | | | | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | Millions of dollars | | 2016 | | 2015 | | 2016 | | 2015 | | 2016 | | 2015 | Funded status | | | | | | | | | | | | | Fair value of plan assets | | $ | 2,664 |
| | $ | 2,741 |
| | $ | 510 |
| | $ | 552 |
| | $ | — |
| | $ | — |
| Benefit obligations | | 3,415 |
| | 3,470 |
| | 855 |
| | 865 |
| | 376 |
| | 441 |
| Funded status | | $ | (751 | ) | | $ | (729 | ) | | $ | (345 | ) | | $ | (313 | ) | | $ | (376 | ) | | $ | (441 | ) | Amounts recognized in the consolidated balance sheet | |
| | | | | | | | | | | Noncurrent asset | | $ | — |
| | $ | — |
| | $ | 2 |
| | $ | 5 |
| | $ | — |
| | $ | — |
| Current liability | | (14 | ) | | (10 | ) | | (10 | ) | | (12 | ) | | (42 | ) | | (51 | ) | Noncurrent liability | | (737 | ) | | (719 | ) | | (337 | ) | | (306 | ) | | (334 | ) | | (390 | ) | Amount recognized | | $ | (751 | ) | | $ | (729 | ) | | $ | (345 | ) | | $ | (313 | ) | | $ | (376 | ) | | $ | (441 | ) | Amounts recognized in accumulated other comprehensive loss (pre-tax) | | | | | | | | | | | | | Net actuarial loss | | $ | 1,426 |
| | $ | 1,404 |
| | $ | 176 |
| | $ | 99 |
| | $ | 3 |
| | $ | 20 |
| Prior service (credit) cost | | (7 | ) | | (11 | ) | | (3 | ) | | (3 | ) | | (40 | ) | | (25 | ) | Amount recognized | | $ | 1,419 |
| | $ | 1,393 |
| | $ | 173 |
| | $ | 96 |
| | $ | (37 | ) | | $ | (5 | ) |
|
Change in Benefit Obligation | Change in Benefit Obligation | | | | | | | | | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | Millions of dollars | | 2016 | | 2015 | | 2016 | | 2015 | | 2016 | | 2015 | Benefit obligation, beginning of year | | $ | 3,470 |
| | $ | 3,796 |
| | $ | 865 |
| | $ | 1,026 |
| | $ | 441 |
| | $ | 502 |
| Service cost | | 3 |
| | 3 |
| | 5 |
| | 5 |
| | 7 |
| | 2 |
| Interest cost | | 147 |
| | 150 |
| | 27 |
| | 31 |
| | 18 |
| | 19 |
| Plan participants’ contributions | | — |
| | — |
| | 1 |
| | 1 |
| | 6 |
| | 7 |
| Actuarial loss (gain) | | 92 |
| | (164 | ) | | 105 |
| | (11 | ) | | (16 | ) | | (32 | ) | Benefits paid | | (286 | ) | | (315 | ) | | (31 | ) | | (31 | ) | | (54 | ) | | (55 | ) | Plan amendments | | — |
| | — |
| | — |
| | (3 | ) | | (30 | ) | | 8 |
| Settlements / curtailment (gain) | | (11 | ) | | — |
| | (16 | ) | | (66 | ) | | — |
| | — |
| Foreign currency exchange rates | | — |
| | — |
| | (101 | ) | | (87 | ) | | 4 |
| | (10 | ) | Benefit obligation, end of year | | $ | 3,415 |
| | $ | 3,470 |
| | $ | 855 |
| | $ | 865 |
| | $ | 376 |
| | $ | 441 |
| Accumulated benefit obligation, end of year | | $ | 3,406 |
| | $ | 3,459 |
| | $ | 816 |
| | $ | 806 |
| | N/A |
| | N/A |
|
|
Change in Plan Assets | Change in Plan Assets | | | | | | | | | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | Millions of dollars | | 2016 | | 2015 | | 2016 | | 2015 | | 2016 | | 2015 | Fair value of plan assets, beginning of year | | $ | 2,741 |
| | $ | 3,042 |
| | $ | 552 |
| | $ | 640 |
| | $ | — |
| | $ | — |
| Actual return on plan assets | | 206 |
| | (62 | ) | | 47 |
| | 16 |
| | — |
| | — |
| Employer contribution | | 14 |
| | 76 |
| | 30 |
| | 39 |
| | 48 |
| | 48 |
| Plan participants’ contributions | | — |
| | — |
| | 1 |
| | 1 |
| | 6 |
| | 7 |
| Benefits paid | | (286 | ) | | (315 | ) | | (31 | ) | | (31 | ) | | (54 | ) | | (55 | ) | Other Adjustments | | — |
| | — |
| | — |
| | 4 |
| | — |
| | — |
| Settlements | | (11 | ) | | — |
| | (14 | ) | | (73 | ) | | — |
| | — |
| Foreign currency exchange rates | | — |
| | — |
| | (75 | ) | | (44 | ) | | — |
| | — |
| Fair value of plan assets, end of year | | $ | 2,664 |
| | $ | 2,741 |
| | $ | 510 |
| | $ | 552 |
| | $ | — |
| | $ | — |
|
|
Components of Net Periodic Benefit Cost | Components of Net Periodic Benefit Cost | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | Millions of dollars | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | Service cost | | $ | 3 |
| | $ | 3 |
| | $ | 2 |
| | $ | 5 |
| | $ | 5 |
| | $ | 5 |
| | $ | 7 |
| | $ | 2 |
| | $ | 3 |
| Interest cost | | 147 |
| | 150 |
| | 167 |
| | 27 |
| | 31 |
| | 22 |
| | 18 |
| | 19 |
| | 24 |
| Expected return on plan assets | | (186 | ) | | (191 | ) | | (193 | ) | | (30 | ) | | (33 | ) | | (16 | ) | | — |
| | — |
| | — |
| Amortization: | | | |
| |
| | | |
| |
| | | |
| |
| Actuarial loss | | 46 |
| | 53 |
| | 43 |
| | 4 |
| | 5 |
| | 5 |
| | — |
| | — |
| | — |
| Prior service cost (credit) | | (3 | ) | | (3 | ) | | (3 | ) | | — |
| | — |
| | 1 |
| | (15 | ) | | (23 | ) | | (36 | ) | Curtailment gain | | 4 |
| | — |
| | — |
| | (1 | ) | | — |
| | — |
| | — |
| | (63 | ) | | — |
| Settlement loss | | — |
| | — |
| | — |
| | 3 |
| | 12 |
| | 4 |
| | — |
| | — |
| | — |
| Net periodic benefit cost | | $ | 11 |
| | $ | 12 |
| | $ | 16 |
| | $ | 8 |
| | $ | 20 |
| | $ | 21 |
| | $ | 10 |
| | $ | (65 | ) | | $ | (9 | ) |
|
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (Pre-Tax) in 2012 | Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Loss (Pre-Tax) in 2016 | | | | | | | | | | | | | | Millions of dollars | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | Current year actuarial loss | | $ | 73 |
| | $ | 83 |
| | $ | (17 | ) | Actuarial (loss) recognized during the year | | (51 | ) | | (6 | ) | | — |
| Current year prior service cost (credit) | | — |
| | — |
| | (30 | ) | Prior service credit (cost) recognized during the year | | 3 |
| | — |
| | 15 |
| Total recognized in other comprehensive loss (pre-tax) | | $ | 25 |
| | $ | 77 |
| | $ | (32 | ) | Total recognized in net periodic benefit costs and other comprehensive loss (pre-tax) | | $ | 36 |
| | $ | 85 |
| | $ | (22 | ) |
|
Estimated Pre-Tax Amounts that will be amortized from Accumulated Other Comprehensive Loss into Net Periodic Pension Cost in 2013 | Estimated Pre-Tax Amounts that will be amortized from Accumulated Other Comprehensive Loss into Net Periodic Pension Cost in 2017 | | | | | | | | | | | | | | Millions of dollars | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | Actuarial loss | | $ | 50 |
| | $ | 7 |
| | $ | — |
| Prior service (credit) | | (3 | ) | | — |
| | (15 | ) | Total | | $ | 47 |
| | $ | 7 |
| | $ | (15 | ) |
Additionally, we amortize prior service credits over a period of up to 28 years. |
Weighted-average Assumptions Used to Determine Benefit Obligation at the End of the Year and Net Periodic Cost | Weighted-Average Assumptions used to Determine Benefit Obligation at End of Year | | | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | | | 2016 | | 2015 | | 2016 | | 2015 | | 2016 | | 2015 | Discount rate | | 4.15 | % | | 4.45 | % | | 2.64 | % | | 3.40 | % | | 4.42 | % | | 4.51 | % | Rate of compensation increase | | 4.50 | % | | 4.50 | % | | 3.08 | % | | 3.06 | % | | N/A |
| | N/A |
|
Weighted-Average Assumptions used to Determine Net Periodic Cost | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | | 2016 | | 2015 | | 2014 | Discount rate | | 4.45 | % | | 4.05 | % | | 4.95 | % | | 3.40 | % | | 3.32 | % | | 3.89 | % | | 4.88 | % | | 4.74 | % | | 5.25 | % | Expected long-term rate of return on plan assets | | 7.00 | % | | 7.00 | % | | 7.25 | % | | 5.81 | % | | 5.63 | % | | 5.44 | % | | N/A |
| | N/A |
| | N/A |
| Rate of compensation increase | | 4.50 | % | | 4.50 | % | | 4.50 | % | | 3.06 | % | | 3.23 | % | | 3.35 | % | | N/A |
| | N/A |
| | N/A |
| Health care cost trend rate | | | | | | | | | | | | | | | | | | | Initial rate | | N/A |
| | N/A |
| | N/A |
| | N/A |
| | N/A |
| | N/A |
| | 7.00 | % | | 7.00 | % | | 7.00 | % | Ultimate rate | | N/A |
| | N/A |
| | N/A |
| | N/A |
| | N/A |
| | N/A |
| | 5.00 | % | | 5.00 | % | | 5.00 | % | Year that ultimate rate will be reached | | N/A |
| | N/A |
| | N/A |
| | N/A |
| | N/A |
| | N/A |
| | 2019 |
| | 2019 |
| | 2017 |
|
|
Estimated Impact of One Percentage-Point Change in Assumed Health Care Cost Trend Rate | A one percentage point change in assumed health care cost trend rates would have the following effects on our health care plan: | | | | | | | | | | Millions of dollars | | One Percentage Point Increase | | One Percentage Point Decrease | Effect on total of service and interest cost | | $ | — |
| | $ | — |
| Effect on postretirement benefit obligations | | 3 |
| | (2 | ) |
|
Expected Employer Contributions to Funded Plans | Expected Employer Contributions to Funded Plans | | | | | | | | | | Millions of dollars | | United States Pension Benefits(1) | | Foreign Pension Benefits | 2017 | | $ | 42 |
| | $ | 15 |
|
|
Expected Benefit Payments | Expected Benefit Payments | | | | | | | | | | | | | | Millions of dollars | | United States Pension Benefits | | Foreign Pension Benefits | | Other Postretirement Benefits | 2017 | | $ | 295 |
| | $ | 33 |
| | $ | 42 |
| 2018 | | 272 |
| | 32 |
| | 34 |
| 2019 | | 269 |
| | 36 |
| | 34 |
| 2020 | | 259 |
| | 36 |
| | 33 |
| 2021 | | 255 |
| | 35 |
| | 32 |
| 2022-2026 | | 1,162 |
| | 189 |
| | 132 |
|
|
Schedule of Allocation of Plan Assets | The fair values of our pension plan assets at December 31, 2016 and 2015, by asset category were as follows: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | December 31, | | | Quoted prices (Level 1) | | Other significant observable inputs (Level 2) | | Significant unobservable inputs (Level 3) | | Net Asset Value | | Total | Millions of dollars | | 2016 | | 2015 | | 2016 | | 2015 | | 2016 | | 2015 | | 2016 | | 2015 | | 2016 | | 2015 | Cash and cash equivalents | | $ | 47 |
| | $ | 26 |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | — |
| | $ | 47 |
| | $ | 26 |
| Government and government agency securities(a) | | | | | | | | | | | | | | | | | | | | | U.S. securities | | — |
| | — |
| | 455 |
| | 494 |
| | — |
| | — |
| | — |
| | — |
| | 455 |
| | 494 |
| International securities | | — |
| | — |
| | 163 |
| | 212 |
| | — |
| | — |
| | — |
| | — |
| | 163 |
| | 212 |
| Corporate bonds and notes (a) | | | | | | | | | | | | | | | | | | | | | U.S. companies | | — |
| | — |
| | 892 |
| | 909 |
| | — |
| | — |
| | — |
| | — |
| | 892 |
| | 909 |
| International companies | | — |
| | — |
| | 190 |
| | 160 |
| | — |
| | — |
| | — |
| | — |
| | 190 |
| | 160 |
| Equity securities (b) | | | | | | | | | | | | | | | | | | | | | U.S. companies | | 14 |
| | 13 |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 14 |
| | 13 |
| International companies | | 454 |
| | 472 |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 454 |
| | 472 |
| Mutual funds (c) | | 64 |
| | 59 |
| | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 64 |
| | 59 |
| Common and collective funds (d) | | | | | | | | | | | | | | | | | | | | | U.S. equity securities | | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 650 |
| | 648 |
| | 650 |
| | 648 |
| International equity securities | | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 56 |
| | 65 |
| | 56 |
| | 65 |
| Short-term investment fund | | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 30 |
| | 55 |
| | 30 |
| | 55 |
| Limited partnerships (e) | | | | | | | | | | | | | | | | | | | | | U.S. private equity investments | | — |
| | — |
| | — |
| | — |
| | 104 |
| | 120 |
| | — |
| | — |
| | 104 |
| | 120 |
| Diversified fund of funds | | — |
| | — |
| | — |
| | — |
| | 14 |
| | 21 |
| | — |
| | — |
| | 14 |
| | 21 |
| Emerging growth | | — |
| | — |
| | — |
| | — |
| | 14 |
| | 15 |
| | — |
| | — |
| | 14 |
| | 15 |
| Real estate (f) | | — |
| | — |
| | — |
| | — |
| | — |
| | — |
| | 10 |
| | 10 |
| | 10 |
| | 10 |
| All other investments | | — |
| | — |
| | 17 |
| | 14 |
| | — |
| | — |
| | — |
| | — |
| | 17 |
| | 14 |
| | | $ | 579 |
| | $ | 570 |
| | $ | 1,717 |
| | $ | 1,789 |
| | $ | 132 |
| | $ | 156 |
| | $ | 746 |
| | $ | 778 |
| | $ | 3,174 |
| | $ | 3,293 |
|
| | (a) | Valued using pricing vendors who use proprietary models to estimate the price a dealer would pay to buy a security using significant observable inputs, such as interest rates, yield curves, and credit risk. |
| | (b) | Valued using the closing stock price on a national securities exchange, which reflects the last reported sales price on the last business day of the year. |
| | (c) | Valued using the net asset value (NAV) of the fund, which is based on the fair value of underlying securities. The fund primarily invests in a diversified portfolio of equity securities issued by non-U.S. companies. |
| | (d) | Valued using the NAV of the fund, which is based on the fair value of underlying securities. |
| | (e) | Valued at estimated fair value based on the proportionate share of the limited partnership's fair value, as determined by the general partner. |
| | (f) | Valued using the NAV of the fund, which is based on the fair value of underlying assets. |
|
Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | Fair Value Measurements Using Significant Unobservable Inputs (Level 3) | | | | | | Millions of dollars | | Limited Partnerships | Balance, December 31, 2015 | | $ | 156 |
| Realized gains (net) | | 16 |
| Unrealized gains (net) | | (9 | ) | Purchases | | 2 |
| Settlements | | (33 | ) | Balance, December 31, 2016 | | $ | 132 |
|
|
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets | The projected benefit obligation and fair value of plan assets for pension plans with a projected benefit obligation in excess of plan assets at December 31, 2016 and 2015 were as follows: | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | Millions of dollars | | 2016 | | 2015 | | 2016 | | 2015 | Projected benefit obligation | | $ | 3,415 |
| | $ | 3,470 |
| | $ | 759 |
| | $ | 776 |
| Fair value of plan assets | | 2,664 |
| | 2,741 |
| | 421 |
| | 469 |
|
|
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets | The projected benefit obligation, accumulated benefit obligation and fair value of plan assets for pension plans with an accumulated benefit obligation in excess of plan assets at December 31, 2016 and 2015 were as follows: | | | | | | | | | | | | | | | | | | | | United States Pension Benefits | | Foreign Pension Benefits | Millions of dollars | | 2016 | | 2015 | | 2016 | | 2015 | Projected benefit obligation | | $ | 3,415 |
| | $ | 3,470 |
| | $ | 720 |
| | $ | 730 |
| Accumulated benefit obligation | | 3,406 |
| | 3,459 |
| | 699 |
| | 690 |
| Fair value of plan assets | | 2,664 |
| | 2,741 |
| | 383 |
| | 424 |
|
|