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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 6,415		$ 6,087
Other policyholder funds and benefits payable	613		638	$ 645
Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, after Allowance for Credit Loss	6,415		6,087
Financing Receivable, Allowance for Credit Loss	44	$ 48	51	$ 46	$ 41	$ 36
Significant Unobservable Inputs (Level 3) \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, after Allowance for Credit Loss	6,415		6,087
Other policyholder funds and benefits payable	613		638
Significant Unobservable Inputs (Level 3) \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, after Allowance for Credit Loss	6,057		5,584
Other policyholder funds and benefits payable	613		639
Significant Observable Inputs (Level 2) \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	3,866		3,863
Junior Subordinated Debentures	499		499
Significant Observable Inputs (Level 2) \| Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	3,615		3,533
Junior Subordinated Debentures	$ 463		$ 429