Investments - Commercial Mortgage Loans by Year of Origination (Details) - Commercial $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Origination Year
Year one	$ 351	$ 1,422
Year two	1,423	1,850
Year three	1,844	2,396
Year four	2,388	1,225
Year five	1,196	2,536
Year six and prior	10,229	7,881
Total	17,431	17,310
Less than 65%
Origination Year
Year one	333	1,368
Year two	1,373	1,710
Year three	1,735	2,335
Year four	2,335	1,214
Year five	1,190	2,446
Year six and prior	10,079	7,789
Total	$ 17,045	$ 16,862
Debt-Service Coverage Ratio
Year one	2.64	1.90
Year two	1.90	2.06
Year three	2.05	3.34
Year four	3.34	3.24
Year five	3.22	2.40
Year six and prior	2.57	2.39
65% to 75%
Origination Year
Year one	$ 18	$ 54
Year two	50	140
Year three	104	61
Year four	53	11
Year five	6	80
Year six and prior	142	78
Total	$ 373	$ 424
Debt-Service Coverage Ratio
Year one	1.31	1.38
Year two	1.35	1.54
Year three	1.59	1.55
Year four	1.54	1.38
Year five	1.43	1.56
Year six and prior	1.59	1.60
Greater than 75%
Origination Year
Year one	$ 0	$ 0
Year two	0	0
Year three	5	0
Year four	0	0
Year five	0	10
Year six and prior	8	14
Total	$ 13	$ 24
Debt-Service Coverage Ratio
Year one	0	0
Year two	0	0
Year three	1.33	0
Year four	0	0
Year five	0	2.33
Year six and prior	1.30	0.87