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Preferred Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Stock [Line Items]      
Preferred stock outstanding $ 1,265 $ 1,265  
Preferred stock, shares outstanding (shares) 1,265 1,265  
Preferred stock, par value (usd per share) $ 0    
Payments for repurchase of redeemable preferred stock $ 0 $ 1,265 $ 300
6.0% Non-Cumulative Preferred Stock, Series I ($1,000,000 stated value)      
Class of Stock [Line Items]      
Dividend Rate 6.00% 6.00%  
Preferred stock, cash consideration   $ 1,265  
Preferred stock, redemption price per share (usd per share) $ 1,000,000    
Floating Rate Non-Cumulative Preferred Stock, Series F ($25 stated value) [Member]      
Class of Stock [Line Items]      
Preferred stock, par value (usd per share)   $ 25  
Floating Rate Non-Cumulative Preferred Stock, Series G ($1,000 stated value) [Member]      
Class of Stock [Line Items]      
Preferred stock, par value (usd per share)   $ 1,000  
6.50% Non-Cumulative Preferred Stock, Series H ($1,000 stated value) [Member]      
Class of Stock [Line Items]      
Dividend Rate   6.50%  
Preferred stock, par value (usd per share)   $ 1,000