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Derivative Instruments and Hedging Activities - Part 3 (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Cash Flow Hedging [Member]        
Derivative Instruments Gain Loss [Line Items]        
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (28) $ 4 $ (82) $ (56)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 18 11 35 (57)
Gains (Losses) Recognized in Earnings (ineffective portion) 0 4 (3) 4
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 0 10 (5) 13
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 0 9 0 23
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 (8) (1) (9) (24)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL (11) (4) (44) (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 (8) 14 (26) 18
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 3 12 (2) 14
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 (66)   (66)  
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (12) (19) (42) (63)
Gain Loss By Type Of Derivative Tables        
Gain (Losses) Recognized in AOCL 26 (6) 81 (79)
Loss on Discontinuation of Cash Flow Hedge Due to Forecasted Transaction Probable of Not Occurring 0 0 0 (16)
Not Designated as Hedging Instrument [Member]        
Gain Loss By Type Of Derivative Tables        
Gains (Losses) Recognized in Earnings (not designated as hedging instruments) (8) 6 177 (6)
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) 2 1 33 7
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) $ (10) $ 5 $ 144 $ (13)