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Deposits (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2015
Jun. 28, 2013
Dec. 31, 2014
Deposits [Abstract]      
Savings and demand deposits $ 143,543   $ 132,159
Time deposits 3,683   1,385
Total 147,226   133,544
Interest-bearing Deposits      
Time deposits maturing in 2015 2,437    
Time deposits maturing in 2016 1,053    
Time deposits maturing in 2017 180    
Time deposits maturing in 2018 13    
Interest-bearing savings deposits payable on demand 143,528    
Deposits subject to FDIC 107,000   $ 99,000
Wealth Management JV      
Noncontrolling Interest [Line Items]      
Purchase of noncontrolling interests, percent   35.00%  
Wealth Management JV | Citi      
Noncontrolling Interest [Line Items]      
Transfer of deposits from joint venture partners $ 8,700