Policyholder Account Balances, Future Policy Benefits and Claims - Composition (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Policyholder account balances
Policyholder account balances	$ 29,229	$ 27,947	$ 24,986
Future policy benefits
Reserve for future policy benefits	7,619	7,763
Deferred profit liability	87	81
Additional liabilities for insurance guarantees	1,336	1,321
Other insurance and annuity liabilities	191	213
Total future policy benefits	9,233	9,378
Policy claims and other policyholders’ funds	205	220
Total policyholder account balances, future policy benefits and claims	$ 38,667	$ 37,545

Liability For Future Policy Benefit, Before Reinsurance, Additional Liabilities For Insurance Guarantees

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- Definition

Liability For Future Policy Benefit, Before Reinsurance, Deferred Profit Liability

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Liability For Future Policy Benefit, Before Reinsurance, Other Insurance And Annuity Liabilities

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Liability For Future Policy Benefit, Before Reinsurance, Reserve

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- Definition

Policyholder Account Balance, Liability For Future Policy Benefits And Unpaid Claims And Claims Adjustment Expense

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Policyholder Account Balances 1

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- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

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Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract.

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- Definition

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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