Derivatives and Hedging Activities (Details Textuals) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Derivative [Line Items]
Margin on interest rate swaps	$ 6		$ 6		$ 12
Derivatives, hedged liabilities	1,800		1,800		3,500
Cumulative amount of fair value hedging adjustment	19		19		40
Net (decrease) in interest expense on long term debt	(10)	$ (14)	(22)	$ (12)
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative	7,500		7,500		6,700
Other, Net
Derivative [Line Items]
(Loss) gain in changes in fair value of derivatives not designated as hedges	(1)	5	(2)	16
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	3,200		3,200		$ 2,900
(Loss) gain on net investment hedges, net of taxes	$ (27)	$ (216)	$ (21)	$ 130