Derivatives and Hedging Activities - Credit Derivatives Sold and Held (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Credit Derivatives [Line Items]
Notional Amount	$ 75	$ 149
Payment / Performance Risk	0.00%	0.00%
Other
Credit Derivatives [Line Items]
Notional Amount	$ 75	$ 149
Average Term (Years)	15 years 29 days	13 years 10 months 9 days
Payment / Performance Risk	4.02%	3.15%