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Financial Instruments (Fair Values Of Derivatives Instruments) (Detail) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Schedule of Cost-method Investments [Line Items]      
Fair Value, Asset Derivatives $ 35 $ 11  
Fair Value, Liability Derivatives 10 8  
Designated As Hedging Instruments [Member] | Interest Rate Swaps [Member]      
Schedule of Cost-method Investments [Line Items]      
Fair Value, Asset Derivatives 19 8  
Fair Value, Liability Derivatives 0 0  
Not Designated As Hedging Instruments [Member] | Foreign Exchange Contract [Member]      
Schedule of Cost-method Investments [Line Items]      
Fair Value, Asset Derivatives 14 3  
Fair Value, Liability Derivatives 5 7  
Not Designated As Hedging Instruments [Member] | Interest Rate Contracts [Member]      
Schedule of Cost-method Investments [Line Items]      
Fair Value, Asset Derivatives 1 0  
Fair Value, Liability Derivatives $ 5 1  
Not Designated As Hedging Instruments [Member] | Commodity Contracts [Member]      
Schedule of Cost-method Investments [Line Items]      
Fair Value, Asset Derivatives   0 $ 1
Fair Value, Liability Derivatives   $ 0 $ 0