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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
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Balance at beginning of period $ 27,654 $ 27,317
Transfer of realized losses/(gains) in fair value to earnings 34 104
Balance at end of period 27,149 25,820
Cash flow hedges    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Unrealized (loss)/gain in fair value (3) (23)
Derivative Cash Flow Hedges    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Balance at beginning of period (161) (213)
Balance at end of period (159) (155)
Derivative Cash Flow Hedges | Cash flow hedges    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Balance at beginning of period (161) (213)
Transfer of realized losses/(gains) in fair value to earnings 5 81
Unrealized (loss)/gain in fair value (3) (23)
Balance at end of period $ (159) $ (155)