Future Policy Benefits (Rollforward of Unpaid Claims) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Balance at January 1,	$ 16,468	$ 16,098	$ 15,598
Less: Reinsurance recoverables	2,592	2,452	2,629
Net Balance at January 1,	13,876	13,646	12,969
Incurred related to:
Current year	26,626	27,080	26,505
Prior years	57	374	668
Total incurred	26,683	27,454	27,173
Paid related to:
Current year	(20,607)	(20,220)	(19,917)
Prior years	(6,624)	(7,004)	(6,579)
Total paid	(27,231)	(27,224)	(26,496)
Net Balance at December 31,	13,328	13,876	13,646
Add: Reinsurance recoverables	2,790	2,592	2,452
Balance at December 31,	$ 16,118	$ 16,468	$ 16,098

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.

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Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred and costs incurred in the claim settlement process.

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Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims.

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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, after effects of reinsurance, of payments to settle insured claims and pay costs incurred in the claims settlement process.

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Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

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