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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion $ (94) $ (22) $ 12
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (117) (51) (45)
Gain (Loss) on Derivative Instruments, Net, Pretax 173 15 3
Interest Rate Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (16) (66) (35)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (52) (82) (101)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net (7) 3 (1)
AOCI before tax expected increase (decrease) next 12 months 59    
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring 0 (13) 0
Cross Currency Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (26) 31 21
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (43) 34 8
Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (52) (5) (4)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (16) (20) (8)
Gain (Loss) on Derivative Instruments, Net, Pretax 148 1 19
Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 0 18 30
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (6) 17 56
Gain (Loss) on Derivative Instruments, Net, Pretax $ 25 $ 14 $ (16)