Derivatives and Hedging Activities Textuals (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Derivatives, Fair Value [Line Items]
Derivatives, hedged liabilities	$ 3,500	$ 8,700
Cumulative amount of fair value hedging adjustments	40	(2)
Net (decrease) increase in interest expense on long-term debt	(39)	90	$ 75
Notional amounts of foreign currency derivatives	2,900	3,000
Net gains on derivatives not designated as hedges	15	87	59
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Derivatives, Fair Value [Line Items]
Gain (loss) on net investment hedges, net of taxes	(131)	(44)	$ 127
Fair Value Hedging [Member]
Derivatives, Fair Value [Line Items]
Derivatives, hedged liabilities	$ 3,500	$ 8,800