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Sale of Certain Private Banking Client Relationships (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Aug. 31, 2017
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Client deposit   $ 118,702   $ 129,248 $ 118,579
Client investments transferred during the fourth quarter   500      
Client deposits transferred during the fourth quarter   300      
Client deposits held for sale   673   $ 0  
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%        
Client deposits held for sale   700      
Additional deposits conditionally eligible for transfer   400      
Other assets [Member]          
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Contingent consideration receivable   $ 15      
Other Income (Loss) [Member]          
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Pre-tax gain on sale     $ 8    
Maximum [Member] | Other assets [Member]          
Risks Inherent in Servicing Assets and Servicing Liabilities [Line Items]          
Contingent consideration receivable     $ 26