Hedging Activities (Effect on Consolidated Financial Statements) (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Gain (loss) recognized in income	$ (148)	$ 105	$ (57)	$ 201
Foreign Exchange And Other Contracts - Balance Sheet, Loans And Other [Member] | Other Income (Expense), Net [Member]
Gain (loss) recognized in income	(48)	19	(62)	38
Foreign Currency Hedges Related To Translated Earnings [Member] | Translated Earnings Contract (Loss) Gain, Net [Member]
Gain (loss) recognized in income	$ (100)	$ 86	$ 5	$ 163