Related Parties - Summary of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Related Party Transaction [Line Items]
Investment funds	$ 19,452	$ 17,668
Related Party
Related Party Transaction [Line Items]
Investment funds	1,619	1,632
Related Party | Athora
Related Party Transaction [Line Items]
Investment funds	1,066	1,082
Equity Securities, FV-NI	284	249
Investments	$ 1,350	$ 1,331