Investments - Commercial Mortgage Loans by Year of Origination (Details) - Commercial $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Origination Year
Year one	$ 1,420	$ 1,876
Year two	1,849	2,407
Year three	2,378	1,297
Year four	1,216	2,753
Year five	2,494	2,289
Year six and prior	7,862	6,301
Total	17,219	16,923
Less than 65%
Origination Year
Year one	1,366	1,769
Year two	1,709	2,335
Year three	2,317	1,280
Year four	1,205	2,643
Year five	2,404	2,222
Year six and prior	7,770	6,170
Total	$ 16,771	$ 16,419
Debt-Service Coverage Ratio
Year one	1.90	2.06
Year two	2.07	3.05
Year three	3.34	2.99
Year four	3.23	2.17
Year five	2.39	2.17
Year six and prior	2.39	2.44
65% to 75%
Origination Year
Year one	$ 54	$ 105
Year two	140	72
Year three	61	17
Year four	11	81
Year five	80	67
Year six and prior	78	131
Total	$ 424	$ 473
Debt-Service Coverage Ratio
Year one	1.38	1.50
Year two	1.54	1.53
Year three	1.55	1.58
Year four	1.38	1.50
Year five	1.56	1.62
Year six and prior	1.60	1.75
Greater than 75%
Origination Year
Year one	$ 0	$ 2
Year two	0	0
Year three	0	0
Year four	0	29
Year five	10	0
Year six and prior	14	0
Total	$ 24	$ 31
Debt-Service Coverage Ratio
Year one	0	1.45
Year two	0	0
Year three	0	0
Year four	0	1.58
Year five	2.33	0
Year six and prior	0.87	0