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Financial Instruments - Cash Flow Hedges Effect on Accumulated Other Comprehensive Earnings/(Losses), Net of Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract] |  |  |
Balance at beginning of period | $ 25,713 | $ 26,074 | $ 25,195
Transfer of realized (gains)/losses in fair value to earnings | 279 | 169 | 174
Balance at end of period | 27,351 | 25,713 | 26,074
Cash Flow Hedges |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract] |  |  |
Transfer of realized (gains)/losses in fair value to earnings | 154 | (9) | 27
Unrealized gain/(loss) in fair value | (199) | (45) | (19)
Derivative Cash Flow Hedges |  |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract] |  |  |
Balance at beginning of period | (167) | (113) | (121)
Balance at end of period | $ (212) | $ (167) | $ (113)

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