Investments - Commercial Mortgage Loans by Year of Origination (Details) - Commercial $ in Millions	Sep. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Origination Year
Year one	$ 1,255	$ 1,422
Year two	1,423	1,850
Year three	1,831	2,396
Year four	2,354	1,225
Year five	1,181	2,536
Year six and prior	9,764	7,881
Total	17,808	17,310
LTV Less Than 65%
Origination Year
Year one	1,197	1,368
Year two	1,378	1,710
Year three	1,731	2,335
Year four	2,307	1,214
Year five	1,177	2,446
Year six and prior	9,629	7,789
Total	$ 17,419	$ 16,862
Debt-Service Coverage Ratio
Year one	1.64	1.90
Year two	1.75	2.06
Year three	2.05	3.34
Year four	3.08	3.24
Year five	3.16	2.40
Year six and prior	2.35	2.39
LTV 65% to 75%
Origination Year
Year one	$ 58	$ 54
Year two	45	140
Year three	95	61
Year four	47	11
Year five	4	80
Year six and prior	127	78
Total	$ 376	$ 424
Debt-Service Coverage Ratio
Year one	1.30	1.38
Year two	1.36	1.54
Year three	1.55	1.55
Year four	1.52	1.38
Year five	1.53	1.56
Year six and prior	1.58	1.60
LTV 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	1.31	0
Year four	0	0
Year five	0	2.33
Year six and prior	1.30	0.87