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Fair Value Measurements - Financial Instruments Not Carried at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, after Allowance for Credit Loss	$ 6,619		$ 6,396
Other policyholder funds and benefits payable	614		614	$ 613
Commercial Loan [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Financing Receivable, after Allowance for Credit Loss	6,619		6,396
Financing Receivable, Allowance for Credit Loss	49	$ 43	44	$ 44	$ 48	$ 51
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	6,619		6,396
Other policyholder funds and benefits payable	614		614
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	6,362		5,901
Other policyholder funds and benefits payable	615		614
Significant Observable Inputs (Level 2) \| Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Senior Notes	3,871		3,867
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	3,536		3,406
Junior Subordinated Debentures	$ 470		$ 460