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Financial Instruments (Effect of Derivative Instruments) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative Instruments, Gain (Loss) [Line Items]      
AOCE reclassified during next twelve months $ 1    
Interest expense [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain (loss) reclassified from AOCE into income (9) $ (4) $ (6)
Interest Rate Contract [Member] | Cash Flow Hedging [Member]      
Derivative Instruments, Gain (Loss) [Line Items]      
Interest rate derivative contracts $ (7) $ (17) $ (4)