Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 162,506	$ 168,438
Mutual funds and collective investment trusts
Fair Value, Separate Account Investment [Line Items]
Separate account assets	161,823	167,759
Exchange-traded funds
Fair Value, Separate Account Investment [Line Items]
Separate account assets	249	336
Fixed maturity AFS securities
Fair Value, Separate Account Investment [Line Items]
Separate account assets	168	161
Cash and invested cash
Fair Value, Separate Account Investment [Line Items]
Separate account assets	77	12
Other investments
Fair Value, Separate Account Investment [Line Items]
Separate account assets	$ 189	$ 170