v3.7.0.1
Derivative Instruments and Hedging Activities (Schedule Of Fair Value Of Outstanding Derivatives) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Interest Rate Contract [Member] | Prepaid expenses and other current assets | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value $ 2 $ 0
Interest Rate Contract [Member] | Other assets | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 10 10
Interest Rate Contract [Member] | Other current liabilities | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value 0 0
Interest Rate Contract [Member] | Other liabilities | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value 0 0
Foreign Exchange Forward [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 120 166
Liability Derivatives, Fair Value 23 16
Foreign Exchange Forward [Member] | Prepaid expenses and other current assets | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 61 80
Foreign Exchange Forward [Member] | Other assets | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 43 59
Foreign Exchange Forward [Member] | Other current liabilities | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value 7 2
Foreign Exchange Forward [Member] | Other liabilities | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value 9 4
Foreign Exchange Forward [Member] | Prepaid expenses and other current assets | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Asset Derivatives, Fair Value 4 17
Foreign Exchange Forward [Member] | Other current liabilities | Not Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Liability Derivatives, Fair Value $ 7 $ 10