Reinsurance - Schedule of Assets in Support of Reserves (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	$ 82,300	$ 99,465
Trading securities	2,321	3,446
Equity securities	306	427
Derivative investments	6,305	3,519
Other investments	4,757	3,577
Cash and invested cash	3,193	2,499	$ 2,331	$ 1,462
Accrued investment income	982	1,234
Other assets	10,597	7,677
Athene Holding Ltd.
Ceded Credit Risk [Line Items]
Fixed maturity AFS securities	177	474
Trading securities	1,556	2,644
Equity securities	58	60
Mortgage loans on real estate	288	487
Derivative investments	43	39
Other investments	41	42
Cash and invested cash	582	26
Accrued investment income	23	35
Other assets	6	2
Total	$ 2,774	$ 3,809