Investments - Schedule of Mortgage Loans Amortized Cost by Debt Service Coverage Ratio Distribution and Year of Origination (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost, net	$ 822	$ 762
Mortgage loans on real estate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	833	769
Allowance	(11)	(7)
Amortized cost, net	822	762
Mortgage loans on real estate | 2018 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	116
Mortgage loans on real estate | 2019
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	236
Mortgage loans on real estate | 2020
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	52
Mortgage loans on real estate | 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	184
Mortgage loans on real estate | 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	102
Mortgage loans on real estate | Current
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	143
Below 1.0 | Mortgage loans on real estate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	13	18
Below 1.0 | Mortgage loans on real estate | 2018 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
Below 1.0 | Mortgage loans on real estate | 2019
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
Below 1.0 | Mortgage loans on real estate | 2020
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
Below 1.0 | Mortgage loans on real estate | 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
Below 1.0 | Mortgage loans on real estate | 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	13
Below 1.0 | Mortgage loans on real estate | Current
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.0 - 1.25 | Mortgage loans on real estate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	41	42
1.0 - 1.25 | Mortgage loans on real estate | 2018 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	27
1.0 - 1.25 | Mortgage loans on real estate | 2019
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	12
1.0 - 1.25 | Mortgage loans on real estate | 2020
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.0 - 1.25 | Mortgage loans on real estate | 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.0 - 1.25 | Mortgage loans on real estate | 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.0 - 1.25 | Mortgage loans on real estate | Current
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	2
1.26 - 1.50 | Mortgage loans on real estate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	133	151
1.26 - 1.50 | Mortgage loans on real estate | 2018 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	24
1.26 - 1.50 | Mortgage loans on real estate | 2019
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	4
1.26 - 1.50 | Mortgage loans on real estate | 2020
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	10
1.26 - 1.50 | Mortgage loans on real estate | 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	0
1.26 - 1.50 | Mortgage loans on real estate | 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	30
1.26 - 1.50 | Mortgage loans on real estate | Current
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	65
Above 1.50 | Mortgage loans on real estate
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	646	$ 558
Above 1.50 | Mortgage loans on real estate | 2018 and prior
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	65
Above 1.50 | Mortgage loans on real estate | 2019
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	220
Above 1.50 | Mortgage loans on real estate | 2020
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	42
Above 1.50 | Mortgage loans on real estate | 2021
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	184
Above 1.50 | Mortgage loans on real estate | 2022
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	59
Above 1.50 | Mortgage loans on real estate | Current
Debt and Equity Securities, FV-NI [Line Items]
Amortized cost before allowance	$ 76