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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period $ 27,149 $ 25,820 $ 27,654 $ 27,317
Transfer of realized losses/(gains) in fair value to earnings 25 62 59 166
Balance at end of period 27,620 26,097 27,620 26,097
Cash flow hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Unrealized (loss)/gain in fair value 13 (6) 10 (29)
Derivative Cash Flow Hedges        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]        
Balance at beginning of period (159) (155) (161) (213)
Balance at end of period (142) (154) (142) (154)
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 (159) (155) (161) (213)
Transfer of realized losses/(gains) in fair value to earnings 4 7 9 88
Unrealized (loss)/gain in fair value 13 (6) 10 (29)
Balance at end of period $ (142) $ (154) $ (142) $ (154)