The changes in and the amount of the accrued benefit obligation at December 31, 2013 and 2012 were:
| 2013 | 2012 | |||||||
| (in millions) | ||||||||
|
Accrued benefit obligation at January 1 |
$ | 458 | $ | 3,453 | ||||
|
Service cost |
15 | 35 | ||||||
|
Interest cost |
20 | 121 | ||||||
|
Benefits paid |
(7 | ) | (142 | ) | ||||
|
Plan amendments |
(3 | ) | (51 | ) | ||||
|
Currency |
(7 | ) | 8 | |||||
|
Assumption changes |
(56 | ) | 519 | |||||
|
Actuarial (gains) / losses |
(4 | ) | 47 | |||||
|
Impact of Spin-Off |
– | (3,561 | ) | |||||
|
Other |
6 | 29 | ||||||
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Accrued benefit obligation at December 31 |
$ | 422 | $ | 458 | ||||
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