Derivatives and Hedging Activities (Details Textuals) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Margin on interest rate swap not netted	$ 11,000,000	$ 34,000,000
Carrying values of hedged liabilities	13,100,000,000	16,400,000,000
Cumulative amount of fair value hedging adjustments	237,000,000	622,000,000
Net increases (reductions) in interest expense on long term debt and other	(256,000,000)	(256,000,000)	$ 102,000,000
Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	19,000,000,000	14,400,000,000
Other Expense
Derivatives, Fair Value [Line Items]
(Loss) gain in changes in fair value of derivatives not designated as hedges	(21,000,000)	10,000,000	64,000,000
Gain on embedded derivatives	0	0	3,000,000
Credit Valuation Adjustment
Derivatives, Fair Value [Line Items]
Fixed-rate debt obligations designated in fair value relationships	0	0
Fair Value Hedges
Derivatives, Fair Value [Line Items]
Fixed-rate debt obligations designated in fair value relationships	12,900,000,000	15,800,000,000
Net Investment Hedges
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	12,600,000,000	10,500,000,000
Gain (loss) on net investment hedges, net of taxes	176,000,000	(253,000,000)	(140,000,000)
Reclassifications out of AOCI	$ 0	$ 0	$ 0