Policyholders' Account Balances - Policyholder Account Balance (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
Jun. 30, 2024	Dec. 31, 2023
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	$ 17,177
Balance, end of period	80,489	$ 17,177
Annuity
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	14,694	12,012
Issuances	4,064	4,382
Acquisition from business combination	61,296	0
Premiums received	23	34
Policy charges	(122)	(39)
Surrenders and withdrawals	(3,060)	(2,132)
Interest credited	707	437
Benefit payments	(152)	0
Other	3	0
Balance, end of period	77,453	14,694
Total PAB balance, end of period	$ 78,358	$ 15,128
Weighted-average crediting rate	2.88%	3.27%
Net amount at risk	$ 12,466	$ 417
Cash surrender value	71,450	15,000
Annuity \| Supplmental Contracts
Policyholder Account Balance [Roll Forward]
Reconciling items	489	291
Annuity \| Variable Universal Life
Policyholder Account Balance [Roll Forward]
Reconciling items	0	0
Annuity \| Deferred Variable Annuity
Policyholder Account Balance [Roll Forward]
Reconciling items	8	8
Annuity \| Insurance, Other
Policyholder Account Balance [Roll Forward]
Reconciling items	408	135
Life
Policyholder Account Balance [Roll Forward]
Balance, beginning of period	1,975	1,899
Issuances	36	84
Acquisition from business combination	0	0
Premiums received	213	399
Policy charges	(187)	(362)
Surrenders and withdrawals	(43)	(110)
Interest credited	48	65
Benefit payments	0	0
Other	0	0
Balance, end of period	2,042	1,975
Total PAB balance, end of period	$ 2,131	$ 2,049
Weighted-average crediting rate	4.78%	3.34%
Net amount at risk	$ 38,365	$ 38,365
Cash surrender value	1,796	1,796
Life \| Supplmental Contracts
Policyholder Account Balance [Roll Forward]
Reconciling items	0	0
Life \| Variable Universal Life
Policyholder Account Balance [Roll Forward]
Reconciling items	39	36
Life \| Deferred Variable Annuity
Policyholder Account Balance [Roll Forward]
Reconciling items	0	0
Life \| Insurance, Other
Policyholder Account Balance [Roll Forward]
Reconciling items	$ 50	$ 38

Policyholder Account Balance, Acquisition From Business Combination

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Policyholder Account Balance, Including Reconciling Items

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

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Amount of interest expense for allocation to policyholder account balance.

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Amount of cash outflow to policyholder account balance from benefit payment.

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Amount of increase (decrease) in liability for policyholder account balance from change, classified as other.

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Amount of increase in liability for policyholder account balance from contract issuance.

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Amount of guaranteed benefit in excess of current account balance of policyholder account balance.

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Amount of decrease in liability for policyholder account balance from policy charge.

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Amount of cash inflow to policyholder account balance from premium received.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of decrease in liability for policyholder account balance from contract redemption and withdrawal of funds.

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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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