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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Cash Flow Hedging [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (9) $ (21)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 72 (13)
Cash Flow Hedging [Member] | Commodity Contract [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (4) 1
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 0 12
Cash Flow Hedging [Member] | Foreign currency derivatives [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 1 (2)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 6 (15)
Cash Flow Hedging [Member] | Cross currency derivatives [Member]    
Derivative Instruments Gain Loss [Line Items]    
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 10 4
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 19 12
Cash Flow Hedging [Member] | Interest Rate Contract [Member]    
Derivative Instruments Gain Loss [Line Items]    
Accumulated Other Comprehensive Income Loss Before Tax Expected Increase Decrease Next Twelve Months 44  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (16) (24)
Gain Loss By Type Of Derivative Tables    
Gain (Losses) Recognized in AOCL 47 (22)
Not Designated as Hedging Instrument [Member]    
Gain Loss By Type Of Derivative Tables    
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 117 (34)
Not Designated as Hedging Instrument [Member] | Other Contract [Member]    
Gain Loss By Type Of Derivative Tables    
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) 9 (2)
Not Designated as Hedging Instrument [Member] | Foreign currency derivatives [Member]    
Gain Loss By Type Of Derivative Tables    
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) $ 108 $ (32)