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Financial Instruments - Cash Flow Hedges Effect on Accumulated Other Comprehensive Earnings/(Losses), Net of Taxes (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]      
Balance at beginning of period $ 28,323 $ 27,654 $ 27,317
Transfer of realized (gains)/losses in fair value to earnings 21 (44) 285
Balance at end of period 26,920 28,323 27,654
Cash Flow Hedges      
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net [Abstract]      
Unrealized gain/(loss) in fair value 153 168 (109)
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) (213)
Balance at end of period (34) (148) (161)
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) (213)
Transfer of realized (gains)/losses in fair value to earnings (39) (155) 161
Unrealized gain/(loss) in fair value 153 168 (109)
Balance at end of period $ (34) $ (148) $ (161)