Investments - Mortgage Loans Credit Ratings Indicator (Details) - Commercial Real Estate - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	$ 1,047	$ 902
1
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	16	28
2 to 4
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	1,018	861
5 and 6
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	13	13
7
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2022
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	279
2022 | 1
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0
2022 | 2 to 4
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	279
2022 | 5 and 6
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0
2022 | 7
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0
2021
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	247	255
2021 | 1
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2021 | 2 to 4
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	247	255
2021 | 5 and 6
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2021 | 7
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2020
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	48	48
2020 | 1
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2020 | 2 to 4
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	48	48
2020 | 5 and 6
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2020 | 7
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2019
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	11	40
2019 | 1
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2019 | 2 to 4
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	11	40
2019 | 5 and 6
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2019 | 7
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2018
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	57	75
2018 | 1
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
2018 | 2 to 4
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	54	72
2018 | 5 and 6
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	3	3
2018 | 7
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	0	0
Prior
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	405	484
Prior | 1
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	16	28
Prior | 2 to 4
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	379	446
Prior | 5 and 6
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	10	10
Prior | 7
Mortgage Loans on Real Estate [Line Items]
Mortgage loans	$ 0	$ 0