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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period $ 27,553 $ 27,620 $ 28,323 $ 27,654
Transfer of realized losses/(gains) in fair value to earnings (103) (26) (143) (63)
Balance at end of period 26,670 27,754 26,670 27,754
Cash flow hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Unrealized (loss)/gain in fair value 127 45 258 151
Derivative Cash Flow Hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period (88) (142) (148) (161)
Balance at end of period (83) (149) (83) (149)
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 (88) (142) (148) (161)
Transfer of realized losses/(gains) in fair value to earnings (122) (52) (193) (139)
Unrealized (loss)/gain in fair value 127 45 258 151
Balance at end of period $ (83) $ (149) $ (83) $ (149)