Business and Basis of Presentation - Gain on Equity Method Investment (Details) $ in Millions		3 Months Ended		9 Months Ended
	Jul. 01, 2023 USD ($) rISK	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	$ 444
Gain on sale of asset management subsidiaries	$ 255	$ 255	$ 0	$ 255	$ 0
Goodwill and other intangible assets		$ 6		$ 6		$ 163
Consolidated Investment Vehicles
Schedule of Equity Method Investments [Line Items]
Number of remaining CIVs | rISK	3
Sound Point Agreement
Schedule of Equity Method Investments [Line Items]
Goodwill and other intangible assets	$ 155
Sound Point Capital Management, LP [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	419
Gain on sale of asset management subsidiaries	248
Equity in earnings (losses) of investees (4)
Schedule of Equity Method Investments [Line Items]
Equity method investments, fair value	25
Assured IM
Schedule of Equity Method Investments [Line Items]
Equity method investments	189
Assured Healthcare Partners LLC
Schedule of Equity Method Investments [Line Items]
Gain on sale of asset management subsidiaries	$ 7