(Gains Losses Recognized In Accumulated Other Comprehensive Income AOCI Net Of Tax Related To Derivative Instruments) (Details) - Other Comprehensive Income (Loss) [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash Flow Hedging [Member] | Foreign Exchange Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), unrealized gain (loss) on derivatives arising during period, before tax	$ (34)	$ 4	$ (10)
Net Investment Hedging [Member] | Interest Rate Contract [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Other comprehensive income (loss), unrealized gain (loss) on derivatives arising during period, before tax	$ 25	$ 7	$ 0