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Objectives And Strategies For Using Derivatives (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative Instruments, Gain (Loss)
Other Comprehensive Income (Loss), Net Investment Hedge, Gain (Loss), before Reclassification and Tax			$ 69
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Gain (loss) on undesignated foreign exchange hedging instruments	$ 2	$ 23	(8)	$ 31
Foreign currency exchange contracts \| Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss)
Derivative, Notional Amount	2,100		2,100
Fair Value Hedging \| Interest Rate Contract
Derivative Instruments, Gain (Loss)
Long-term Debt, Fair Value	638		638
Derivative, Notional Amount	625		625
Cash Flow Hedging \| Foreign currency exchange contracts
Derivative Instruments, Gain (Loss)
Derivative, Notional Amount	709		709
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	79		79		$ 44
Derivative Liability	$ 39		$ 39		$ 92