Pensions and Other Postretirement Benefits
The following tables summarize the components of net periodic pension and other postretirement benefits (OPEB) (income) expense (dollars in millions): | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2015 | | Three Months Ended June 30, 2014 | | Pension Benefits | | Global OPEB Plans | | Pension Benefits | | Global OPEB Plans | | U.S. | | Non-U.S. | | | U.S. | | Non-U.S. | | Service cost | $ | 102 |
| | $ | 95 |
| | $ | 6 |
| | $ | 96 |
| | $ | 112 |
| | $ | 6 |
| Interest cost | 688 |
| | 195 |
| | 59 |
| | 765 |
| | 263 |
| | 69 |
| Expected return on plan assets | (974 | ) | | (202 | ) | | — |
| | (979 | ) | | (222 | ) | | — |
| Amortization of prior service cost (credit) | (1 | ) | | 4 |
| | (3 | ) | | (1 | ) | | 4 |
| | (4 | ) | Amortization of net actuarial (gains) losses | 2 |
| | 59 |
| | 9 |
| | (23 | ) | | 41 |
| | 2 |
| Curtailments, settlements and other | — |
| | 107 |
| | — |
| | — |
| | (1 | ) | | — |
| Net periodic pension and OPEB (income) expense | $ | (183 | ) | | $ | 258 |
| | $ | 71 |
| | $ | (142 | ) | | $ | 197 |
| | $ | 73 |
|
| | | | | | | | | | | | | | | | | | | | | | | | | | Six Months Ended June 30, 2015 | | Six Months Ended June 30, 2014 | | Pension Benefits | | Global OPEB Plans | | Pension Benefits | | Global OPEB Plans | | U.S. | | Non-U.S. | | | U.S. | | Non-U.S. | | Service cost | $ | 203 |
| | $ | 195 |
| | $ | 12 |
| | $ | 191 |
| | $ | 205 |
| | $ | 11 |
| Interest cost | 1,377 |
| | 391 |
| | 119 |
| | 1,530 |
| | 525 |
| | 137 |
| Expected return on plan assets | (1,948 | ) | | (405 | ) | | — |
| | (1,957 | ) | | (441 | ) | | — |
| Amortization of prior service cost (credit) | (2 | ) | | 8 |
| | (6 | ) | | (2 | ) | | 9 |
| | (8 | ) | Amortization of net actuarial (gains) losses | 4 |
| | 117 |
| | 17 |
| | (46 | ) | | 80 |
| | 4 |
| Curtailments, settlements and other | — |
| | 107 |
| | — |
| | (2 | ) | | 1 |
| | — |
| Net periodic pension and OPEB (income) expense | $ | (366 | ) | | $ | 413 |
| | $ | 142 |
| | $ | (286 | ) | | $ | 379 |
| | $ | 144 |
|
The curtailment charges recorded in the three and six months ended June 30, 2015 were due primarily to the General Motors Canada Limited (GMCL) hourly pension plan that was remeasured as a result of a voluntary separation program. |