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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 09, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  |  | $ 37,695 |  | $ 37,695 |  |
Total other comprehensive income (loss) |  | $ (31) |  | $ (10) | 313 | $ (1) |
End of period |  | 35,611 |  |  | 35,611 |  |
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 |  |  |  |  | 18 |  |
Foreign Currency |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  | (128) |  | (119) |  | (127) |
Beginning of the year, adjusted |  |  |  |  |  |  | $ (129)
Other comprehensive income (loss) before reclassifications |  | (27) |  | (10) | (26) | (2) |
Total other comprehensive income (loss) |  | (27) |  | (10) | (26) | (2) |
End of period |  | (155) | (128) | (129) | (155) | (129) |
Cash Flow Hedges |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  | 325 |  | (4) |  | (5) |
Beginning of the year, adjusted |  |  |  |  |  |  | (18)
Other comprehensive income (loss) before reclassifications |  |  |  |  | 344 |  |
Amounts reclassified from accumulated other comprehensive income (loss) |  | (4) |  |  | (5) | 1 |
Total other comprehensive income (loss) |  | (4) |  |  | 339 | 1 |
End of period |  | 321 | 325 | (4) | 321 | (4) |
Pension and Other Postretirement Benefits |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  | (25) |  | (173) |  | (173) |
Beginning of the year, adjusted |  |  |  |  |  |  | (25)
End of period |  | (25) | (25) | (173) | (25) | (173) |
Accumulated Other Comprehensive Income (Loss). |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  | 172 |  | (296) |  | (305) |
Beginning of the year, adjusted |  |  |  |  |  |  | (172)
Other comprehensive income (loss) before reclassifications |  | (27) |  | (10) | 318 | (2) |
Amounts reclassified from accumulated other comprehensive income (loss) |  | (4) |  |  | (5) | 1 |
Total other comprehensive income (loss) |  | (31) |  | (10) | 313 | (1) |
End of period |  | $ 141 | 172 | $ (306) | 141 | $ (306) |
Adjustments Early Adoption | ASU 2018-02 | 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 period |  |  | (129) |  | (129) |  |
Previously Reported | Cash Flow Hedges |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  |  | (15) |  | (15) |  |
Previously Reported | Pension and Other Postretirement Benefits |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  |  | (21) |  | (21) |  |
Previously Reported | Accumulated Other Comprehensive Income (Loss). |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Beginning of period |  |  | $ (165) |  | $ (165) |  |
Unsecured senior notes of $40 billion |  |  |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) rollforward |  |  |  |  |  |  |
Aggregate Principal | $ 40,000 |  |  |  |  |  |

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