Derivatives and Hedging Activities (Details Textuals) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Margin on interest rate swaps	$ 3		$ 3		$ 12
Derivatives, hedged liabilities	1,800		1,800		3,500
Cumulative amount of fair value hedging adjustment	11		11		40
Net (decrease) in interest expense on long term debt	(7)	$ (15)	(29)	$ (27)
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative	8,300		8,300		6,700
Other, Net
Derivative [Line Items]
(Loss) gain in changes in fair value of derivatives not designated as hedges	(2)	1	(4)	17
Fair Value Hedging
Derivative [Line Items]
Derivatives, hedged liabilities	1,800		1,800		3,500
Net Investment Hedges
Derivative [Line Items]
Notional amounts of derivatives	3,600		3,600		$ 2,900
Net hedges of investments in foreign operations	$ 88	$ (59)	$ 67	$ 71