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Virtus Acquisition - Virtus Acquisition Narrative (Details) - USD ($) $ in Millions		1 Months Ended	12 Months Ended
	Jan. 02, 2020	Jan. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition
Purchase of noncontrolling interest			$ 173	$ 0	$ 0
Virtus Acquisition
Business Acquisition
Percentage of equity interests acquired	70.00%
Call option exercise period	2 years
Put option exercise period	3 years
Virtus Acquisition | Virtus Partners
Business Acquisition
Percentage of equity interests acquired		100.00%
Noncontrolling interest, ownership percentage by noncontrolling owners	30.00%
Purchase of noncontrolling interest		$ 173

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