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Separate Account Assets and Liabilities (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Separate Account, Liability [Roll Forward]
Balance, beginning of period	$ 1,266	$ 1,145	$ 1,189	$ 1,045
Additions (deductions):
Acquisition from business combination	0	0	0	0
Policyholder deposits	20	19	55	58
Net investment income	9	7	19	21
Net realized capital gains (losses) on investments	44	(36)	156	78
Policyholder benefits and withdrawals	(28)	(37)	(103)	(96)
Net transfers from (to) separate accounts	(6)	(5)	(4)	(6)
Policy charges	(3)	(3)	(10)	(10)
Total changes	36	(55)	113	45
Balance, end of period	$ 1,302	$ 1,090	$ 1,302	$ 1,090

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