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Acquisitions - Acquired Intangible Assets (Details) - Eaton Vance Corp.
$ 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