Investments - Schedule of Residential Loans Segregated by Risk Rating Exposure and Non-accrual Loans by Amortized Cost (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost of Non-Accrual Loans [Abstract]
Amortized cost of loans on non-accrual	$ 72	$ 71
Residential mortgages
Credit Quality Indicator Current Year [Abstract]
2023	35	771
2022	956	900
2021	915	229
2020	225	223
2019	231	24
Prior	212	33
Credit Quality Indicator Prior Year [Abstract]
2022	35	771
2021	956	900
2020	915	229
2019	225	223
2018	231	24
Prior	212	33
Total	2,574	2,180
Amortized Cost of Non-Accrual Loans [Abstract]
Amortized cost of loans on non-accrual	63	62
Commercial mortgages
Credit Quality Indicator Current Year [Abstract]
2023	53	350
2022	354	1,300
2021	1,301	488
2020	486	0
2019	0	0
Prior	276	278
Loans	2,456	2,407
Credit Quality Indicator Prior Year [Abstract]
2022	53	350
2021	354	1,300
2020	1,301	488
2019	486	0
2018	0	0
Prior	276	278
Total	2,470	2,416
Amortized Cost of Non-Accrual Loans [Abstract]
Amortized cost of loans on non-accrual	9	9
Current (less than 30 days past due) | Residential mortgages
Credit Quality Indicator Current Year [Abstract]
2023	35	766
2022	950	884
2021	889	214
2020	209	185
2019	199	23
Prior	209	33
Credit Quality Indicator Prior Year [Abstract]
2022	35	766
2021	950	884
2020	889	214
2019	209	185
2018	199	23
Prior	209	33
Total	2,491	2,105
Current (less than 30 days past due) | Commercial mortgages
Credit Quality Indicator Current Year [Abstract]
2023	53	350
2022	354	1,300
2021	1,301	488
2020	486	0
2019	0	0
Prior	267	269
Credit Quality Indicator Prior Year [Abstract]
2022	53	350
2021	354	1,300
2020	1,301	488
2019	486	0
2018	0	0
Prior	267	269
Total	2,461	2,407
30-89 days past due | Residential mortgages
Credit Quality Indicator Current Year [Abstract]
2023	0	2
2022	3	7
2021	8	0
2020	3	4
2019	4	0
Prior	2	0
Credit Quality Indicator Prior Year [Abstract]
2022	0	2
2021	3	7
2020	8	0
2019	3	4
2018	4	0
Prior	2	0
Total	20	13
30-89 days past due | Commercial mortgages
Credit Quality Indicator Current Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	0	0
Credit Quality Indicator Prior Year [Abstract]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	0	0
Total	0	0
90 days or more past due | Residential mortgages
Credit Quality Indicator Current Year [Abstract]
2023	0	3
2022	3	9
2021	18	15
2020	13	34
2019	28	1
Prior	1	0
Credit Quality Indicator Prior Year [Abstract]
2022	0	3
2021	3	9
2020	18	15
2019	13	34
2018	28	1
Prior	1	0
Total	63	62
90 days or more past due | Commercial mortgages
Credit Quality Indicator Current Year [Abstract]
2023	0	0
2022	0	0
2021	0	0
2020	0	0
2019	0	0
Prior	9	9
Credit Quality Indicator Prior Year [Abstract]
2022	0	0
2021	0	0
2020	0	0
2019	0	0
2018	0	0
Prior	9	9
Total	$ 9	$ 9