Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 84,138	$ 81,900
Mortgage loans on real estate	21,857	20,940
Derivative investments	8,219	9,512
Accrued investment income	1,022	993
LPINE
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	9,293	9,287
Mortgage loans on real estate	1,935	1,941
Derivative investments	178	190
Accrued investment income	95	97
Total	$ 11,501	$ 11,515