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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, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion $ 12 $ (73) $ (430)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (45) (77) (125)
Gain (Loss) on Derivative Instruments, Net, Pretax 2 176 198
AOCI before tax expected increase (decrease) next 12 months (90)    
Interest Rate Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (35) (103) (421)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (101) (116) (144)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net (1) (6) (4)
Cross Currency Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 21 (20) (25)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 8 (24) (23)
Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (4) 10 (28)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (8) 32 14
Gain (Loss) on Derivative Instruments, Net, Pretax 19 211 144
Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 30 40 44
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 56 31 28
Gain (Loss) on Derivative Instruments, Net, Pretax $ (16) $ (29) $ 58