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Benefit Plans - Funded status (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Items not yet recognized as a component of net periodic cost: |  |  |
Deferred income tax | $ (782) | $ (487) |
Unrecognized pension and other postretirement benefit cost | 1,347 | 1,419 |
Pension benefits |  |  |
Components of net periodic cost |  |  |
Fair value of plan assets | 6,284 | 5,650 | $ 5,353
Less: Benefit obligation | 6,815 | 6,591 | 6,130
Funded status | (531) | (941) |
Items not yet recognized as a component of net periodic cost: |  |  |
Net actuarial loss (gain) | 2,224 | 2,807 |
Prior service credit | (254) | (310) |
Unrecognized pension and other postretirement benefit cost, pre-tax | 1,970 | 2,497 |
Deferred income tax | (419) | (874) |
Unrecognized pension and other postretirement benefit cost | 1,551 | 1,623 |
Postretirement benefits |  |  |
Components of net periodic cost |  |  |
Fair value of plan assets | 0 | 0 |
Less: Benefit obligation | 386 | 373 | $ 405
Funded status | (386) | (373) |
Items not yet recognized as a component of net periodic cost: |  |  |
Net actuarial loss (gain) | (218) | (251) |
Prior service credit | (37) | (62) |
Unrecognized pension and other postretirement benefit cost, pre-tax | (255) | (313) |
Deferred income tax | 51 | 109 |
Unrecognized pension and other postretirement benefit cost | $ (204) | $ (204) |

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