Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 1,994	$ 3,311
Separate accounts liabilities	1,994	3,311	$ 3,250
Separate Account Asset
Fair Value, Separate Account Investment [Line Items]
Separate accounts liabilities		188
Total
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,994	3,499
Cash and cash equivalents
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	156	165
Debt securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	393	856
Debt securities | U.S. government securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	36	186
Debt securities | States, municipalities and political subdivisions
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	11	14
Debt securities | U.S. corporate securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	291	524
Debt securities | Foreign securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	39	51
Mortgage-backed securities | Residential mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	8	71
Mortgage-backed securities | Commercial mortgage-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	3	3
Other asset-backed securities
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	5	7
Common/collective trusts
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 1,445	$ 2,478