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Line of Business Information - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
line_of_business
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Segment Reporting Information [Line Items]      
Number of lines of business | line_of_business 2    
Noninterest expense $ 8,050 $ 7,827 $ 7,192
Acquisition and restructuring costs $ 25 133 104
Investment Servicing and Investment Management | Maximum      
Segment Reporting Information [Line Items]      
Percent of consolidated revenues by segment 75.00%    
Other      
Segment Reporting Information [Line Items]      
Noninterest expense $ 98 219 180
Acquisition and restructuring costs 25 133 104
Severance costs $ 73 84 11
Provision for litigation and other costs   $ 2 $ 65
Other | Minimum      
Segment Reporting Information [Line Items]      
Percent of consolidated revenues by segment 25.00%    
Boston Financial Data Services, Inc.      
Segment Reporting Information [Line Items]      
Ownership percentage 50.00%    
International Financial Data Services      
Segment Reporting Information [Line Items]      
Ownership percentage 50.00%