Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 87,111	$ 88,738
Trading securities	2,025	2,359
Equity securities	294	306
Mortgage loans on real estate	21,083	18,963
Derivative investments	9,677	6,474
Other investments	6,588	5,015
Cash and invested cash	5,801	3,365	$ 3,343	$ 2,612
Accrued investment income	1,108	1,082
Other assets	8,163	8,853
Fortitude Re
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	7,764	8,867
Derivative investments	30	0
Other investments	1,419	759
Cash and invested cash	28	141
Accrued investment income	96	103
Other assets	0	1
Total	9,337	9,871
Athene Holding Ltd.
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	142	177
Trading securities	1,385	1,556
Equity securities	42	58
Mortgage loans on real estate	232	288
Derivative investments	46	43
Other investments	54	41
Cash and invested cash	147	582
Accrued investment income	18	23
Other assets	1	6
Total	$ 2,067	$ 2,774