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Retirement Plans and Other Post-Retirement Benefits | 3 Months Ended
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Mar. 31, 2017
Compensation And Retirement Disclosure [Abstract] |
Retirement Plans and Other Post-Retirement Benefits |
7. | RETIREMENT PLANS AND OTHER POST-RETIREMENT BENEFITS
The following tables provide information with respect to the net periodic costs of our pension and post-retirement medical benefit plans.
|  | Three months ended March 31 |
In millions |  | 2017 |  |  |  | 2016 |
Pension Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 2,721 |  |  |  | $ | 2,730 |
Interest cost |  |  | 5,907 |  |  |  |  | 6,087 |
Expected return on plan assets |  |  | (10,831 | ) |  |  |  | (11,386 | )
Amortization of prior service cost |  |  | 704 |  |  |  |  | 674 |
Amortization of unrecognized loss |  |  | 2,822 |  |  |  |  | 3,054 |
Total net periodic benefit cost |  | $ | 1,323 |  |  |  | $ | 1,159 |
Other Benefits |  |  |  |  |  |  |  |  |
Service cost |  | $ | 295 |  |  |  | $ | 323 |
Interest cost |  |  | 485 |  |  |  |  | 540 |
Amortization of prior service credit |  |  | (45 | ) |  |  |  | (45 | )
Amortization of actuarial gain |  |  | (143 | ) |  |  |  | (51 | )
Total net periodic benefit cost |  | $ | 592 |  |  |  | $ | 767 |

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