Investments - Residential Mortgage Loans by Year of Origination (Details) - Residential - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 754	$ 1,909
Year two	2,113	573
Year three	492	525
Year four	490	438
Year five	418	69
Year six and prior	228	150
Total	4,495	3,664
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	754	1,895
Year two	2,074	557
Year three	472	492
Year four	457	427
Year five	404	65
Year six and prior	217	136
Total	4,378	3,572
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	14
Year two	39	16
Year three	20	33
Year four	33	11
Year five	14	4
Year six and prior	11	14
Total	$ 117	$ 92