Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 171,483	$ 158,257
Mutual funds and collective investment trusts
Fair Value, Separate Account Investment [Line Items]
Separate account assets	170,806	157,578
Exchange-traded funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	349	350
Fixed maturity AFS securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	166	167
Cash and invested cash
Fair Value, Separate Account Investment [Line Items]
Separate account assets	7	25
Other investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 155	$ 137