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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax			$ 71
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Gain (loss) on undesignated foreign exchange hedging instruments	$ (12)	$ (5)	(8)	$ (13)
Foreign currency exchange contracts \| Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Derivative, Notional Amount	1,700		1,700
Fair Value Hedging \| Interest Rate Contract
Derivative Instruments, Gain (Loss)
Long-term Debt, Fair Value	325		325
Derivative, Notional Amount	300		300
Cash Flow Hedging \| Foreign currency exchange contracts
Derivative Instruments, Gain (Loss)
Derivative, Notional Amount	663		663
Net Investment Hedging
Derivative Instruments, Gain (Loss)
Derivative, Notional Amount	1,500		1,500
Fair Value, Measurements, Recurring \| Fair Value, Inputs, Level 2
Derivative Instruments, Gain (Loss)
Derivative Asset	113		113		$ 34
Derivative Liability	$ 28		$ 28		$ 44