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Derivatives - BS Location (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets $ 77 $ 259
Fair Value of Derivative Instruments, Liabilities 182 95
Derivatives designated as hedging instruments    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 58 218
Fair Value of Derivative Instruments, Liabilities 135 13
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current assets    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 12 107
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other assets    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 24 86
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Liabilities 80 9
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other liabilities    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Liabilities 52 3
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Current balance sheet location    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount 2,215 2,160
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Noncurrent balance sheet location    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount 1,431 1,459
Derivatives designated as hedging instruments | Interest rate swap contracts    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount   1,953
Derivatives designated as hedging instruments | Interest rate swap contracts | Other assets    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 22 25
Derivatives designated as hedging instruments | Interest rate swap contracts | Other current liabilities    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Liabilities 1 1
Derivatives designated as hedging instruments | Interest rate swap contracts | Other liabilities    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Liabilities 2  
Derivatives designated as hedging instruments | Interest rate swap contracts | Current balance sheet location    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount 450  
Derivatives designated as hedging instruments | Interest rate swap contracts | Noncurrent balance sheet location    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount 1,303  
Derivatives not designated as hedging instruments    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 19 41
Fair Value of Derivative Instruments, Liabilities 47 82
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current assets    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 19 41
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Liabilities 47 82
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Current balance sheet location    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount $ 6,414 $ 5,655