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Derivatives - BS Location (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets $ 52 $ 78
Fair Value of Derivative Instruments, Liabilities 238 197
Derivatives designated as hedging instruments    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 36 48
Fair Value of Derivative Instruments, Liabilities 205 172
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 5 7
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 11 20
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 122 109
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 63 56
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 2,225 2,204
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 1,313 1,392
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 20 21
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 2 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 18 6
Derivatives designated as hedging instruments | Interest rate swap contracts | Current balance sheet location    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount 450 450
Derivatives designated as hedging instruments | Interest rate swap contracts | Noncurrent balance sheet location    
Location and Fair Value Amount of Derivative Instruments    
Derivative Notional Amount 1,703 1,503
Derivatives not designated as hedging instruments    
Location and Fair Value Amount of Derivative Instruments    
Fair Value of Derivative Instruments, Assets 16 30
Fair Value of Derivative Instruments, Liabilities 33 25
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 16 30
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 33 25
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 $ 6,070 $ 4,974