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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period $ 26,097 $ 26,143 $ 27,317 $ 25,602
Transfer of realized losses/(gains) in fair value to earnings 86 143 252 231
Balance at end of period 27,028 26,809 27,028 26,809
Cash flow hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Unrealized (loss)/gain in fair value (69) (75) (98) (214)
Derivative Cash Flow Hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period (154) (295) (213) (168)
Balance at end of period (158) (259) (158) (259)
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 (154) (295) (213) (168)
Transfer of realized losses/(gains) in fair value to earnings 65 111 153 123
Unrealized (loss)/gain in fair value (69) (75) (98) (214)
Balance at end of period $ (158) $ (259) $ (158) $ (259)