Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 83,110	$ 81,900
Mortgage loans on real estate	21,417	20,940
Derivative investments	7,704	9,512
Accrued investment income	1,010	993
LPINE
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	9,304	9,287
Mortgage loans on real estate	1,924	1,941
Derivative investments	131	190
Accrued investment income	101	97
Total	$ 11,460	$ 11,515