Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions	Mar. 31, 2026	Dec. 31, 2025
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 88,329	$ 87,586
Mortgage loans on real estate	22,692	22,338
Derivative investments	8,336	9,945
Accrued investment income	1,054	1,013
LPINE
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	11,328	11,272
Mortgage loans on real estate	2,110	2,115
Derivative investments	171	218
Accrued investment income	128	118
Total	$ 13,737	$ 13,723