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Fair Value Measurement and Fair Value of Financial Instruments (Details 3) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Unobservable Input(s) Level 3      
Securities available for sale $ 12,846 $ 14,344  
Other liabilities $ 2,262 2,017 $ 1,891
Fdic | Minimum | Discounted cash flow      
Unobservable Input(s) Level 3      
Probability of default (as a percent) 0.10%    
Loss severity (as a percent) 0.00%    
Fdic | Maximum | Discounted cash flow      
Unobservable Input(s) Level 3      
Probability of default (as a percent) 100.00%    
Loss severity (as a percent) 100.00%    
Fdic | Weighted Average | Discounted cash flow      
Unobservable Input(s) Level 3      
Probability of default (as a percent) 57.20%    
Loss severity (as a percent) 38.10%    
Level 3 | Fdic      
Unobservable Input(s) Level 3      
Other liabilities $ 117    
Other debt securities, Direct bank purchase bonds      
Unobservable Input(s) Level 3      
Securities available for sale $ 1,575 $ 1,572  
Other debt securities, Direct bank purchase bonds | Minimum | Return on equity      
Unobservable Input(s) Level 3      
Market-required return on capital (as a percent) 8.00%    
Probability of default (as a percent) 0.00%    
Loss severity (as a percent) 10.00%    
Other debt securities, Direct bank purchase bonds | Maximum | Return on equity      
Unobservable Input(s) Level 3      
Market-required return on capital (as a percent) 10.00%    
Probability of default (as a percent) 25.00%    
Loss severity (as a percent) 60.00%    
Other debt securities, Direct bank purchase bonds | Weighted Average | Return on equity      
Unobservable Input(s) Level 3      
Market-required return on capital (as a percent) 9.80%    
Probability of default (as a percent) 0.40%    
Loss severity (as a percent) 28.90%    
Other debt securities, Direct bank purchase bonds | Level 3      
Unobservable Input(s) Level 3      
Securities available for sale $ 1,575