Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 166,225	$ 158,257
Mutual funds and collective investment trusts
Fair Value, Separate Account Investment [Line Items]
Separate account assets	165,556	157,578
Exchange-traded funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	352	350
Fixed maturity AFS securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	162	167
Cash and invested cash
Fair Value, Separate Account Investment [Line Items]
Separate account assets	8	25
Other investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 147	$ 137