Benefit Obligation (millions)
| December 31, | |||||||
| 2013 | 2012 | ||||||
| Change in benefit obligation: | |||||||
| Projected benefit obligation, beginning of year | $ | 4,224 | $ | 3,733 | |||
| Service cost | 3 | 3 | |||||
| Interest cost | 170 | 178 | |||||
| Actuarial (gain) loss | (262) | 444 | |||||
| Benefits paid | (167) | (133) | |||||
| Settlements | - | (32) | |||||
| Plan amendments | - | (1) | |||||
| Foreign currency exchange rates | 26 | 32 | |||||
| Projected benefit obligation, end of year | $ | 3,994 | $ | 4,224 | |||
| Accumulated benefit obligation, end of year | $ | 3,955 | $ | 4,171 | |||