Investments - Commercial Mortgage Loans by Year of Origination (Details) - Commercial $ in Millions	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Origination Year
Year one	$ 350	$ 1,420
Year two	1,421	1,849
Year three	1,844	2,378
Year four	2,370	1,216
Year five	1,187	2,494
Year six and prior	10,169	7,862
Total	17,341	17,219
Less than 65%
Origination Year
Year one	332	1,366
Year two	1,371	1,709
Year three	1,735	2,317
Year four	2,317	1,205
Year five	1,181	2,404
Year six and prior	10,019	7,770
Total	$ 16,955	$ 16,771
Debt-Service Coverage Ratio
Year one	2.64	1.90
Year two	1.90	2.07
Year three	2.05	3.34
Year four	3.34	3.23
Year five	3.21	2.39
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