Policyholder Account Balances - Schedule of Changes in Policyholder Account Balance (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Policyholder Account Balance [Roll Forward]
Beginning balance	$ 13,843
Net transfers from (to) separate accounts	2		$ 2
Interest credited	95	$ 99
Ending balance	13,871		13,843
Life insurance
Policyholder Account Balance [Roll Forward]
Beginning balance	6,993	7,235	7,235
Issuances	0		0
Premiums received	107		447
Policy charges	(142)		(582)
Surrenders and withdrawals	(30)		(152)
Benefit payments	(34)		(243)
Net transfers from (to) separate accounts	0		0
Interest credited	74		297
Other	2		(9)
Ending balance	$ 6,970		$ 6,993
Weighted-average crediting rate	3.90%		3.90%
Net amount at risk	$ 39,202		$ 39,712
Cash surrender value	3,982		4,021
Fixed annuities
Policyholder Account Balance [Roll Forward]
Beginning balance	3,278	3,789	3,789
Issuances	0		0
Premiums received	4		16
Policy charges	(1)		(5)
Surrenders and withdrawals	(80)		(373)
Benefit payments	(64)		(304)
Net transfers from (to) separate accounts	0		0
Interest credited	28		125
Other	8		30
Ending balance	$ 3,173		$ 3,278
Weighted-average crediting rate	3.00%		3.00%
Net amount at risk	$ 32		$ 34
Cash surrender value	2,398		2,490
Variable annuities
Policyholder Account Balance [Roll Forward]
Beginning balance	420	$ 467	467
Issuances	0		0
Premiums received	4		13
Policy charges	(1)		(5)
Surrenders and withdrawals	(10)		(44)
Benefit payments	(12)		(60)
Net transfers from (to) separate accounts	2		2
Interest credited	1		4
Other	7		43
Ending balance	$ 411		$ 420
Weighted-average crediting rate	3.30%		3.30%
Net amount at risk	$ 365		$ 354
Cash surrender value	$ 411		$ 420

Amount of cash to be paid to policyholder upon termination and surrender of long-duration contract issued by insurance entity.

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Weighted-average crediting rate for liability for policyholder account balance, calculated at a point in time.

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Amount due to policyholder. Includes, but is not limited to, unpaid policy dividend, retrospective refund, and undistributed earnings on participating business. Excludes future policy benefit and claim expense.

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