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 available-for-sale securities, at fair value	$ 88,738	$ 99,736
Trading securities	2,359	3,498
Equity securities	306	427
Mortgage loans on real estate	18,963	18,301
Derivative investments	6,474	3,594
Other investments	5,015	3,739
Cash and invested cash	3,365	3,343	$ 2,612	$ 1,708
Accrued investment income	1,082	1,253
Other assets	9,311	6,778
Athene Holding Ltd.
Ceded Credit Risk [Line Items]
Fixed maturity available-for-sale securities, at fair value	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