Other Insurance Liabilities and Separate Accounts - Separate Account Assets (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 3,267	$ 3,228
Separate accounts liabilities	3,267	3,228	$ 4,140	$ 5,087
Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	3,241	3,313
Other Receivables | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	26
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	154	156
Debt securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	2,667	2,677
Debt securities | U.S. government securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	712	717
Debt securities | States, municipalities and political subdivisions | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	28	27
Debt securities | U.S. corporate securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	1,664	1,667
Debt securities | Foreign securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	203	201
Mortgage-backed securities | Residential mortgage-backed securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	6	41
Mortgage-backed securities | Commercial mortgage-backed securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	36	6
Other asset-backed securities | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	18	18
Common/collective trusts | Recurring
Fair Value, Separate Account Investment [Line Items]
Separate accounts assets	$ 420	$ 480