Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 158,257	$ 143,536
Mutual funds and collective investment trusts
Fair Value, Separate Account Investment [Line Items]
Separate account assets	157,578	142,892
Exchange-traded funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	350	258
Fixed maturity AFS securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	167	169
Cash and invested cash
Fair Value, Separate Account Investment [Line Items]
Separate account assets	25	98
Other investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 137	$ 119