Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 85,186	$ 81,900
Mortgage loans on real estate	22,092	20,940
Derivative investments	10,405	9,512
Accrued investment income	1,047	993
LPINE
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	10,534	9,287
Mortgage loans on real estate	2,081	1,941
Derivative investments	206	190
Accrued investment income	115	97
Total	$ 12,936	$ 11,515