Derivatives and Hedging Activities - Schedule of Credit Derivatives Sold and Held (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Credit Derivatives [Line Items]
Notional Amount	$ 2	$ 4
Payment / Performance Risk	0.00%	0.00%
Other
Credit Derivatives [Line Items]
Notional Amount	$ 2	$ 4
Average Term (Years)	11 years 1 month 6 days	10 years 8 months 8 days
Payment / Performance Risk	3.87%	4.86%