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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion $ (22) $ 12 $ (73)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (51) (45) (77)
Gain (Loss) on Derivative Instruments, Net, Pretax 15 3 182
AOCI before tax expected increase (decrease) next 12 months (58)    
Interest Rate Contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (66) (35) (103)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (82) (101) (116)
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net 3 (1) (6)
Loss on discontinuation of cash flow hedge due to forecasted transaction probable of not occurring [1] (13) 0 0
Cross Currency Interest Rate Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 31 21 (20)
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 34 8 (24)
Foreign Exchange Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion (5) (4) 10
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion (20) (8) 32
Gain (Loss) on Derivative Instruments, Net, Pretax 1 19 211
Commodity Contract [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Losses) Recognized in AOCL, Effective Portion 18 30 40
Gains (Losses) Reclassified from AOCL into Earnings, Effective Portion 17 56 31
Gain (Loss) on Derivative Instruments, Net, Pretax $ 14 $ (16) $ (29)
[1] Cash flow hedge was discontinued because it was probable the forecasted transaction will not occur.