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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, 2022
Mar. 31, 2021
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Balance at beginning of period $ 28,323 $ 27,654
Transfer of realized losses/(gains) in fair value to earnings 42 34
Balance at end of period 28,216 27,149
Cash flow hedges    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Unrealized (loss)/gain in fair value 27 (3)
Derivative Cash Flow Hedges    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]    
Balance at beginning of period (148) (161)
Balance at end of period (96) (159)
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 (148) (161)
Transfer of realized losses/(gains) in fair value to earnings 25 5
Unrealized (loss)/gain in fair value 27 (3)
Balance at end of period $ (96) $ (159)