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Acquisitions/Dispositions Acquisitions/Dispositions - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 15, 2016
Document Period End Date Mar. 31, 2017      
Goodwill, Acquired During Period $ 1      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill (13)     $ (13)
Noninterest Expense 1,465   $ 1,318  
Revenues 847   781  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 663   680  
Business Combination, Consideration Transferred (197) $ (197)    
Pillar Financial [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill (1)      
Loans Held For Investment [Member] | Pillar Financial [Member]        
Principal Amount Outstanding of Loans Held-in-portfolio       38
Loans Held For Sale [Member] | Pillar Financial [Member]        
Principal Amount Outstanding of Loans Held-in-portfolio       180
Commercial Mortgage Servicing Rights [Member]        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets 62     $ 62
Corporate Other [Member]        
Noninterest Expense 6   (4)  
Revenues 23   20  
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 29   $ 56