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Sale of Certain Private Banking Client Relationships (Details) - USD ($)
$ in Millions
12 Months Ended 25 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2019
Dec. 31, 2019
Aug. 31, 2017
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Client deposit $ 110,955 $ 118,702   $ 119,693  
Client investments transferred     $ 1,500    
Client deposits transferred     800    
Contingent consideration received     $ 12    
Portion of Latin America Portfolio [Member] | PB [Member]          
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Client investments         $ 3,500
Client deposit         1,700
Fee, as percent of assets transferred during first 2 years of agreement (percent)     0.50%    
Other assets [Member]          
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Contingent consideration receivable 12       $ 15
Other Income (Loss) [Member]          
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Pre-tax gain (loss) on sale $ (3) $ 8