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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities (Effective Portion of Cash Flow Hedges) (Details) - Cash Flow Hedging - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion $ 64 $ (68) $ (492)
Gain (Loss) on Derivative Instruments, Net, Pretax 273 (18) 106
Interest Rate Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 51 (72) (419)
AOCI before tax expected increase (decrease) next 12 months 36    
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring 0 (16) 0
Cross Currency Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 0 0 (15)
Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (4) 2 (62)
Gain (Loss) on Derivative Instruments, Net, Pretax 19 21 29
Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 17 2 4
Gain (Loss) on Derivative Instruments, Net, Pretax $ 261 $ (43) $ (28)