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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion $ (492) $ (91) $ (54)
Gain (Loss) on Derivative Instruments, Net, Pretax 106 (1) (52)
Interest Rate Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (419) (75) (28)
AOCI before tax expected increase (decrease) next 12 months 100    
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring 0 [1] 0 (2) [1]
Cross Currency Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (15) (5) (12)
Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (62) (9) (13)
Gain (Loss) on Derivative Instruments, Net, Pretax 29 68 (46)
Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 4 (2) (1)
Gain (Loss) on Derivative Instruments, Net, Pretax $ (28) $ (68) $ (6)
[1] Cash flow hedge was discontinued on a cross-currency swap in 2019 because the underlying debt was prepaid.