Investments - Residential Mortgage Loans by Year of Origination (Details) - Residential - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 517	$ 583
Year two	555	533
Year three	483	93
Year four	81	137
Year five	112	67
Year six and prior	57	0
Total	1,805	1,413
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	515	578
Year two	533	527
Year three	465	90
Year four	78	119
Year five	99	65
Year six and prior	53	0
Total	1,743	1,379
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	2	5
Year two	22	6
Year three	18	3
Year four	3	18
Year five	13	2
Year six and prior	4	0
Total	$ 62	$ 34