The following tables summarize the components of net periodic pension and other postretirement benefits (OPEB) (income) expense (dollars in millions): | | | | | | | | | | | | | | | | | | Three Months Ended March 31, 2012 | | U.S. Plans Pension Benefits | | Non-U.S. Plans Pension Benefits | | U.S. Plans Other Benefits | | Non-U.S. Plans Other Benefits | Service cost | $ | 160 |
| | $ | 92 |
| | $ | 5 |
| | $ | 5 |
| Interest cost | 1,080 |
| | 277 |
| | 59 |
| | 16 |
| Expected return on plan assets | (1,332 | ) | | (217 | ) | | — |
| | — |
| Amortization of prior service credit | — |
| | — |
| | (29 | ) | | (2 | ) | Recognized net actuarial loss | — |
| | 8 |
| | 13 |
| | 1 |
| Curtailments, settlements, and other (gains) losses | (21 | ) | | 28 |
| | — |
| | — |
| Net periodic pension and OPEB (income) expense | $ | (113 | ) | | $ | 188 |
| | $ | 48 |
| | $ | 20 |
|
| | | | | | | | | | | | | | | | | | Three Months Ended March 31, 2011 | | U.S. Plans Pension Benefits | | Non-U.S. Plans Pension Benefits | | U.S. Plans Other Benefits | | Non-U.S. Plans Other Benefits | Service cost | $ | 158 |
| | $ | 96 |
| | $ | 6 |
| | $ | 9 |
| Interest cost | 1,229 |
| | 301 |
| | 67 |
| | 52 |
| Expected return on plan assets | (1,674 | ) | | (230 | ) | | — |
| | — |
| Amortization of prior service credit | — |
| | — |
| | — |
| | (2 | ) | Recognition of net actuarial loss | — |
| | — |
| | 1 |
| | — |
| Curtailments, settlements, and other losses | — |
| | 3 |
| | — |
| | — |
| Net periodic pension and OPEB (income) expense | $ | (287 | ) | | $ | 170 |
| | $ | 74 |
| | $ | 59 |
|
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