Acquisitions - Acquired Intangible Assets (Details) - Eaton Vance $ in Millions	Mar. 01, 2021 USD ($)
Business Acquisition [Line Items]
Total acquired Intangible assets	$ 3,956
Customer relationships
Business Acquisition [Line Items]
Weighted-average intangible life	16 years
Amortizable acquired intangible assets	$ 1,455
Tradenames
Business Acquisition [Line Items]
Weighted-average intangible life	23 years
Amortizable acquired intangible assets	$ 221
Management contracts
Business Acquisition [Line Items]
Weighted-average intangible life	16 years
Amortizable acquired intangible assets	$ 160
Management contracts
Business Acquisition [Line Items]
Non-amortizable acquired intangible assets	$ 2,120