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Financial Instruments - Cash Flow Hedges Effect on Accumulated Other Comprehensive Earnings/(Losses), Net of Tax (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract] |  |
Balance at beginning of period | $ 27,351 | $ 25,713
Transfer of realized losses/(gains) in fair value to earnings | 104 | 29
Balance at end of period | 25,752 | 25,909
Cash flow hedges |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract] |  |
Transfer of realized losses/(gains) in fair value to earnings | 81 | 0
Unrealized (loss)/gain in fair value | (21) | (69)
Derivative Cash Flow Hedges |  |
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract] |  |
Balance at beginning of period | (212) | (167)
Balance at end of period | $ (152) | $ (236)

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