Related Party Transactions (Effects of Affiliated Reinsurance on Statements of Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Reinsurance Disclosure [Line Items]
Change in market risk benefits	$ 1,103	$ 357	$ 207	$ 1,795
Affiliated Entity | Assumed
Reinsurance Disclosure [Line Items]
Premiums	2	1	4	3
Other revenues	1	1	1	1
Policyholder benefits and claims	4	3	8	7
Change in market risk benefits	(44)	(20)	(14)	(77)
Other expenses	$ (3)	$ (1)	$ (6)	$ 1