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Business and Summary of Significant Accounting Policies - Management Estimates (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 30, 2021
Business Acquisition [Line Items]
Change in total benefits and other changes in policy reserves increase (decrease)	$ 73
Future policy benefits	$ 7,050	$ 5,021	$ 4,918
Change in Accounting Method Accounted for as Change in Estimate
Business Acquisition [Line Items]
Future policy benefits		$ 99		$ (435)

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Policyholder Benefits And Claims Incurred, Net, Life and Annuity, Change In Policy Reserves, Increase (Decrease)

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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