Hedging Activities (Effect on Consolidated Financial Statements) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Gain (loss) recognized in income	$ 22	$ (86)	$ 91	$ 96
Foreign Exchange And Other Contracts - Balance Sheet, Loans And Other [Member] | Other Income (Expense), Net [Member]
Gain (loss) recognized in income	(15)	21	(14)	19
Foreign Currency Hedges Related To Translated Earnings [Member] | Translated Earnings Contract Gain, Net [Member]
Gain (loss) recognized in income	$ 37	$ (107)	$ 105	$ 77