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Business and Summary of Significant Accounting Policies - Contract Holder Funds, Future Policy Benefits and Secured Trust Deposits (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
FABN program, amount outstanding	$ 2,200	$ 1,900
Funds withheld for reinsurance liabilities	3,703	1,676
FHLB collateral pledged	3,387	2,469
Secured trust deposits	$ 862	934
Life and Annuity Insurance Product Line | Minimum
Ceded Credit Risk [Line Items]
Investment yield assumptions	4.30%
Life and Annuity Insurance Product Line | Maximum
Ceded Credit Risk [Line Items]
Investment yield assumptions	4.10%
PRT Annuities | Minimum
Ceded Credit Risk [Line Items]
Investment yield assumptions	3.60%
PRT Annuities | Maximum
Ceded Credit Risk [Line Items]
Investment yield assumptions	6.90%
Federal Home Loan Bank of Atlanta
Ceded Credit Risk [Line Items]
Funds withheld for reinsurance liabilities	$ 1,982	1,543
FHLB collateral pledged	$ 3,387	$ 2,469

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Amount of the collateral pledged in support of federal home loan bank advances outstanding.

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