Derivative Financial Instruments (Schedule of Notional Amounts of Net Foreign Exchange Exposure by Currency) (Details) - Foreign Exchange Contract [Member] $ in Millions	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Total	$ (28)
Brazilian Real [Member]
Derivative [Line Items]
Total	(13)
British Pound Sterling [Member]
Derivative [Line Items]
Total	(93)
Canadian Dollar [Member]
Derivative [Line Items]
Total	36
Euro [Member]
Derivative [Line Items]
Total	(6)
Hungarian Forint [Member]
Derivative [Line Items]
Total	10
Indonesia, Rupiahs
Derivative [Line Items]
Total	(4)
Korea (South), Won
Derivative [Line Items]
Total	10
Singapore Dollar [Member]
Derivative [Line Items]
Total	$ 32