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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period $ 28,216 $ 27,149 $ 28,323 $ 27,654
Transfer of realized losses/(gains) in fair value to earnings (82) 25 (40) 59
Balance at end of period 27,553 27,620 27,553 27,620
Cash flow hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Unrealized (loss)/gain in fair value 104 13 131 10
Derivative Cash Flow Hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period (96) (159) (148) (161)
Balance at end of period (88) (142) (88) (142)
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 (96) (159) (148) (161)
Transfer of realized losses/(gains) in fair value to earnings (96) 4 (71) 9
Unrealized (loss)/gain in fair value 104 13 131 10
Balance at end of period $ (88) $ (142) $ (88) $ (142)