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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Gain (loss) on undesignated foreign exchange hedging instruments	$ (9,000,000)	$ 22,000,000	$ (46,000,000)	$ 38,000,000
Foreign currency exchange contracts \| Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	2,500,000,000		2,500,000,000
Net Investment Hedging
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	638,000,000		$ 638,000,000
Fair Value Hedging
Derivative Instruments, Gain (Loss)
Fair value hedge ineffectiveness assertion			Fair value hedges resulted in no significant ineffectiveness in the nine months ended September 30, 2018 and 2017
Gain (loss) recognized in earnings as a result of hedge not qualifying as a fair value hedge			$ 0	$ 0
Fair Value Hedging \| Interest Rate Contract
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	300,000,000		$ 300,000,000
Cash Flow Hedging
Derivative Instruments, Gain (Loss)
Cash flow hedge ineffectiveness assertion			Cash flow hedges resulted in no significant ineffectiveness for the nine months ended September 30, 2018 and 2017
Maximum Maturity Date			Sep. 30, 2020
Cash Flow Hedging \| Foreign currency exchange contracts
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	664,000,000		$ 664,000,000
Cash Flow Hedging \| Interest Rate Contract
Derivative Instruments, Gain (Loss)
Aggregate notional values of outstanding derivatives	100,000,000		100,000,000
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Derivative Instruments, Gain (Loss)
Derivative Asset	31,000,000		31,000,000		$ 27,000,000
Derivative Liability	$ 33,000,000		$ 33,000,000		$ 51,000,000