Business and Basis of Presentation - Gain on Equity Method Investment (Details) - USD ($) $ in Millions		12 Months Ended
	Jul. 01, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Investments, fair value	$ 450
Gain on sale of asset management subsidiaries	262	$ 262	$ 0	$ 0
Goodwill and other intangible assets		6	$ 163
Sound Point Agreement
Schedule of Equity Method Investments [Line Items]
Goodwill and other intangible assets	155
Sound Point
Schedule of Equity Method Investments [Line Items]
Investments, fair value	425	631
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
Goodwill and other intangible assets		$ 0
Assured Healthcare Partners LLC
Schedule of Equity Method Investments [Line Items]
Gain on sale of asset management subsidiaries	$ 7