Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 3,231	$ 3,228
Separate accounts liabilities	3,231	3,228	$ 4,670	$ 5,087
Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	3,202	3,313
Other Receivables | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	29
Other Payables | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts liabilities		85
Cash and cash equivalents | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	160	156
Debt securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	2,645	2,677
Debt securities | U.S. government securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	705	717
Debt securities | States, municipalities and political subdivisions | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	29	27
Debt securities | U.S. corporate securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,642	1,667
Debt securities | Foreign securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	204	201
Mortgage-backed securities | Residential mortgage-backed securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	39	41
Mortgage-backed securities | Commercial mortgage-backed securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	6	6
Other asset-backed securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	20	18
Common/collective trusts | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 397	$ 480