Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Derivative Instruments, Gain (Loss)
Fair value hedge ineffectiveness assertion	Fair value hedges resulted in no significant ineffectiveness in the three months ended March 31, 2016 and 2015
Gain (loss) recognized in earnings as a result of hedge not qualifying as a fair value hedge	$ 0
Cash flow hedge ineffectiveness assertion	Cash flow hedges resulted in no significant ineffectiveness for the three months ended March 31, 2016 and 2015
Gain (loss) reclassified into earnings as a result of discontinuance of cash flow hedges	$ 0
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	1,800,000,000
Gain (loss) on undesignated foreign exchange hedging instruments	28,000,000	$ (155,000,000)
Net Investment Hedging
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	120,000,000
Fair Value Hedging | Interest Rate Swap
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	$ 375,000,000
Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Derivative, Maturity Date	Dec. 01, 2018
Cash Flow Hedging | Foreign currency exchange contracts
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	$ 787,000,000
Cash Flow Hedging | Interest Rate Swap
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	$ 0