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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Gains recognized in income		$ 105	$ 240	$ 201	$ 85
Foreign Exchange And Other Contracts - Balance Sheet, Loans And Other [Member] | Other Income, Net [Member]
Gains recognized in income		19	10	38	19
Foreign Currency Hedges Related To Translated Earnings [Member] | Translated Earnings Contract Gain, Net [Member]
Gains recognized in income	[1]	$ 86	$ 230	$ 163	$ 66

[1] The impact to income was primarily driven by yen-denominated hedges of translated earnings