Derivative Financial Instruments, Outstanding Forward Contracts By Currency (Details) - Foreign Currency Forward Contracts [Member] $ in Millions	Dec. 31, 2016 USD ($)
Derivative [Line Items]
Notional amount of foreign currency forward contracts	$ 358
U.S. Dollar [Member]
Derivative [Line Items]
Notional amount of foreign currency forward contracts	117
Euro [Member]
Derivative [Line Items]
Notional amount of foreign currency forward contracts	109
Canadian Dollar [Member]
Derivative [Line Items]
Notional amount of foreign currency forward contracts	96
British Pound [Member]
Derivative [Line Items]
Notional amount of foreign currency forward contracts	28
Other [Member]
Derivative [Line Items]
Notional amount of foreign currency forward contracts	$ 8