Derivatives and Hedging Activities (Details Textuals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Derivative [Line Items]
Margin on interest rate swaps	$ 13		$ 11
Carrying values of hedged liabilities	11,100		13,100
Cumulative amount of fair value hedging adjustment	(21)		237
Net decrease in interest expense on long term debt and other	57	$ 73
Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivatives	15,600		19,000
Other Expense
Derivative [Line Items]
(Loss) gain in changes in fair value of derivatives not designated as hedges	(12)	(5)
Fair Value Hedging | Fixed-Rate Debt Obligations
Derivative [Line Items]
Fixed-rate debt obligations designated in fair value hedging relationships	11,100		12,900
Net Investment Hedges
Derivative [Line Items]
Notional amount of derivatives	12,200		$ 12,600
Gain (loss) on net investment hedges, net of taxes	(85)	6
Reclassifications out of AOCI	$ 0	$ 0