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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions |  | 3 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 09, 2018 | Mar. 31, 2018 | Mar. 31, 2017 | Jan. 02, 2018 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  | $ 37,695 |  |  |
Total other comprehensive income |  | 344 | $ 9 |  |
End of year |  | 38,677 |  |  |
Payments received from termination of cash flow hedge | $ 446 | 446 |  |  |
Gains recorded in accumulated other comprehensive income | 331 |  |  |  |
Cash flow hedge gains expected to be reclassified in next 12 months |  | 24 |  |  |
Foreign Currency |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  |  | (127) |  |
Beginning of the year, adjusted |  |  |  | $ (129) |
Other comprehensive income (loss) before reclassifications |  | 1 | 8 |  |
Total other comprehensive income |  | 1 | 8 |  |
End of year |  | (128) | (119) |  |
Losses on Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  |  | (5) |  |
Beginning of the year, adjusted |  |  |  | (18) |
Other comprehensive income (loss) before reclassifications |  | 344 |  |  |
Amounts reclassified from accumulated other comprehensive income |  | (1) | 1 |  |
Total other comprehensive income |  | 343 | 1 |  |
End of year |  | 325 | (4) |  |
Pension and Other Postretirement Benefits |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  |  | (173) |  |
Beginning of the year, adjusted |  |  |  | (25) |
End of year |  | (25) | (173) |  |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  |  | (305) |  |
Beginning of the year, adjusted |  |  |  | $ (172) |
Other comprehensive income (loss) before reclassifications |  | 345 | 8 |  |
Amounts reclassified from accumulated other comprehensive income |  | (1) | 1 |  |
Total other comprehensive income |  | 344 | 9 |  |
End of year |  | 172 | $ (296) |  |
Adjustments Early Adoption | ASU 2018-02 | Losses on Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Retained earnings adjustment |  |  |  |  | $ (3)
Adjustments Early Adoption | ASU 2018-02 | Pension and Other Postretirement Benefits |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Retained earnings adjustment |  |  |  |  | (4)
Adjustments Early Adoption | ASU 2018-02 | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Retained earnings adjustment |  |  |  |  | $ (7)
Previously Reported | Foreign Currency |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  | (129) |  |  |
Previously Reported | Losses on Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  | (15) |  |  |
Previously Reported | Pension and Other Postretirement Benefits |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  | (21) |  |  |
Previously Reported | Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Beginning of year |  | $ (165) |  |  |
Unsecured senior notes of $40 billion |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |
Aggregate Principal | $ 40,000 |  |  |  |

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