Business and Basis of Presentation - Gain on Equity Method Investment (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 01, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]
Investments, fair value	$ 450
Gain on sale of asset management subsidiaries	262	$ 0	$ 262	$ 0
Sound Point Agreement
Schedule of Equity Method Investments [Line Items]
Intangible assets, net (including goodwill)	155
Sound Point
Schedule of Equity Method Investments [Line Items]
Investments, fair value	425
Equity method investments		$ 418	$ 429
Gain on sale of asset management subsidiaries	255
Nonconsolidated Investees, Other
Schedule of Equity Method Investments [Line Items]
Investments, fair value	25
Cash	13
Receivables, fair value disclosure	12
Assured IM
Schedule of Equity Method Investments [Line Items]
Equity method investments	188
Assured Healthcare Partners LLC
Schedule of Equity Method Investments [Line Items]
Gain on sale of asset management subsidiaries	$ 7