Related Party Transactions (Effects of Affiliated Reinsurance on Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Reinsurance Disclosure [Line Items]
Change in market risk benefits	$ (198)	$ 1,580	$ (4,105)	$ (4,142)
Affiliated Entity | Assumed
Reinsurance Disclosure [Line Items]
Premiums	2	0
Policyholder benefits and claims	18	3
Change in market risk benefits	5	(81)
Other expenses, assumed	$ 0	$ (2)