Investments - Commercial Mortgage Loans by Year of Origination (Details) - Commercial $ in Millions	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Origination Year
Year one	$ 1,422	$ 1,876
Year two	1,850	2,426
Year three	2,396	1,306
Year four	1,225	2,795
Year five	2,536	2,296
Year six and prior	7,881	6,315
Total	17,310	17,014
Less than 65%
Origination Year
Year one	1,368	1,769
Year two	1,710	2,354
Year three	2,335	1,289
Year four	1,214	2,685
Year five	2,446	2,225
Year six and prior	7,789	6,184
Total	$ 16,862	$ 16,506
Debt-Service Coverage Ratio
Year one	1.90	2.06
Year two	2.06	3.05
Year three	3.34	3.00
Year four	3.24	2.18
Year five	2.40	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	71
Year six and prior	78	131
Total	$ 424	$ 477
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