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Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 1,934	$ 3,311
Separate accounts liabilities	1,934	3,311	$ 3,334	$ 3,250
Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,891	3,499
Recurring | Other Receivables
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	43
Recurring | Other Payables
Fair Value, Separate Account Investment [Line Items]
Separate accounts liabilities		188
Recurring | Cash and cash equivalents
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	160	165
Recurring | Debt securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	394	856
Recurring | Debt securities | U.S. government securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	36	186
Recurring | Debt securities | States, municipalities and political subdivisions
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	11	14
Recurring | Debt securities | U.S. corporate securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	290	524
Recurring | Debt securities | Foreign securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	42	51
Recurring | Mortgage-backed securities | Residential mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	7	71
Recurring | Mortgage-backed securities | Commercial mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	3	3
Recurring | Other asset-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	5	7
Recurring | Common/collective trusts
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 1,337	$ 2,478

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