The following summarizes our principal contractual commitments, excluding open orders for purchases that support normal operations, as of December 31, 2013 (in millions): | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Year Ended December 31, | | | | | | 2014 | | 2015 | | 2016 | | 2017 | | 2018 | | Thereafter | | Total | Operating and capital commitments: | | | | | | | | | | | | | | Debt principal and interest | $ | 835 |
| | $ | 906 |
| | $ | 81 |
| | $ | 1,081 |
| | $ | 69 |
| | $ | 1,375 |
| | $ | 4,347 |
| Capital leases, including interest | 963 |
| | 883 |
| | 361 |
| | 71 |
| | 42 |
| | 117 |
| | 2,437 |
| Financing lease obligations, including interest | 49 |
| | 48 |
| | 52 |
| | 52 |
| | 53 |
| | 529 |
| | 783 |
| Operating leases | 752 |
| | 654 |
| | 604 |
| | 539 |
| | 470 |
| | 2,116 |
| | 5,135 |
| Unconditional purchase obligations (1) | 539 |
| | 386 |
| | 80 |
| | 37 |
| | 29 |
| | 27 |
| | 1,098 |
| Other commitments (2) (3) | 746 |
| | 275 |
| | 167 |
| | 137 |
| | 110 |
| | 1,194 |
| | 2,629 |
| Total commitments | $ | 3,884 |
| | $ | 3,152 |
| | $ | 1,345 |
| | $ | 1,917 |
| | $ | 773 |
| | $ | 5,358 |
| | $ | 16,429 |
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___________________ | | (1) | Includes unconditional purchase obligations related to agreements to acquire and license digital video content that represent long-term liabilities or are not reflected on the consolidated balance sheets. For those agreements with variable terms, we do not estimate what the total obligation may be beyond any minimum quantities and/or pricing as of the reporting date. Purchase obligations associated with renewal provisions solely at the option of the content provider are included to the extent such commitments are fixed or a minimum amount is specified. |
| | (2) | Includes the estimated timing and amounts of payments for rent and tenant improvements associated with build-to-suit lease arrangements that have not been placed in service. |
| | (3) | Excludes $407 million of tax contingencies for which we cannot make a reasonably reliable estimate of the amount and period of payment, if any |
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