Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

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Shareholders' Equity - Narrative (Details) - USD ($)
 3 Months Ended
Jan. 26, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Jan. 13, 2017
Common Stock            
Common stock dividends declared (in dollars per share) $ 0.075   $ 0.075 $ 0.05    
Common stock repurchased   $ 2,728,000,000     $ 1,000,000,000  
Share-based compensation, number of shares authorized (in shares)   1,600,000,000        
Preferred Stock            
Preferred stock dividends   $ 502,000,000     457,000,000  
Accounting for Share-based Compensation            
Share-based payment award tax benefit   $ 222,000,000        
Restricted Stock Units (RSUs)            
Restricted Stock Units            
Restricted stock units granted in period (in shares)   85,000,000        
Common Stock            
Common Stock            
Common stock repurchased (in shares)   114,000,000        
Common stock repurchased   $ 2,700,000,000        
Stock issued (in shares)   60,000,000        
Shares paid for tax withholding for share based compensation (in shares)   24,000,000        
Retained Earnings            
Preferred Stock            
Preferred stock dividends   $ 502,000,000     $ 457,000,000  
Preferred Stock            
Preferred Stock            
Shares issued (in shares)   0        
Warrants Expiring October 18, 2018            
Common Stock            
Warrants outstanding (in shares)   122,000,000        
Minimum required dividend rate (in dollars per share)   $ 0.32        
Exercise price per warrant (in dollars per share)   $ 30.79        
Warrants Expiring January 16, 2019            
Common Stock            
Warrants outstanding (in shares)   150,000,000        
Minimum required dividend rate (in dollars per share)   $ 0.01        
Exercise price per warrant (in dollars per share)   $ 12.904        
2016 CCAR            
Common Stock            
Shares authorized to be repurchased, amount   $ 5,000,000,000        
Period of stock repurchase program   12 months        
Other authorized repurchases | Common Stock            
Common Stock            
Shares authorized to be repurchased, amount           $ 1,800,000,000.0