Derivative Financial Instruments and Off-balance Sheet Financial Instruments - Schedule of OTC Derivatives Counterparty Credit Exposure by Counterparty Credit Rating (Details) $ in Millions	Dec. 31, 2023 USD ($) counter-party	Dec. 31, 2022 USD ($) counter-party
Credit Derivatives
Number of counter-parties | counter-party	0	2
Notional amount	$ 0	$ 320
Credit exposure	0	12
Exposure, net of collateral	$ 0	$ 0
A+
Credit Derivatives
Number of counter-parties | counter-party	0	1
Notional amount	$ 0	$ 128
Credit exposure	0	5
Exposure, net of collateral	$ 0	$ 0
A
Credit Derivatives
Number of counter-parties | counter-party	0	1
Notional amount	$ 0	$ 192
Credit exposure	0	7
Exposure, net of collateral	$ 0	$ 0