Investments - Residential Mortgage Loans by Year of Origination (Details) - Residential - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	$ 167	$ 1,909
Year two	2,252	573
Year three	514	525
Year four	502	438
Year five	427	69
Year six and prior	238	150
Total	4,100	3,664
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	167	1,895
Year two	2,223	557
Year three	495	492
Year four	471	427
Year five	415	65
Year six and prior	223	136
Total	3,994	3,572
Nonperforming
Financing Receivable, Credit Quality Indicator [Line Items]
Year one	0	14
Year two	29	16
Year three	19	33
Year four	31	11
Year five	12	4
Year six and prior	15	14
Total	$ 106	$ 92