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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	$ 1,900,000,000		$ 1,900,000,000
Gain (loss) on undesignated foreign exchange hedging instruments	19,000,000	$ (14,000,000)	16,000,000	$ 14,000,000
Net Investment Hedging
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	369,000,000		$ 369,000,000
Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Cash flow hedge ineffectiveness assertion			Cash flow hedges resulted in no significant ineffectiveness for the six months ended June 30, 2017 and 2016
Gain (loss) reclassified into earnings as a result of discontinuance of cash flow hedges			$ 0	0
Derivative, Maturity Date			Jul. 20, 2019
Cash Flow Hedging \| Foreign currency exchange contracts
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	750,000,000		$ 750,000,000
Cash Flow Hedging \| Interest Rate Contract
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	486,000,000		$ 486,000,000
Fair Value Hedging
Derivative Instruments, Gain (Loss)
Fair value hedge ineffectiveness assertion			Fair value hedges resulted in no significant ineffectiveness in the six months ended June 30, 2017 and 2016
Gain (loss) recognized in earnings as a result of hedge not qualifying as a fair value hedge			$ 0	$ 0
Fair Value, Measurements, Recurring [Member] \| Fair Value, Inputs, Level 2
Derivative Instruments, Gain (Loss)
Derivative Liability	67,000,000		67,000,000		$ 46,000,000
Derivative Asset	$ 43,000,000		$ 43,000,000		$ 43,000,000