Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Common Stock Narrative (Details)

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Shareholders' Equity - Common Stock Narrative (Details) - USD ($)
$ / shares in Units, shares in Millions
 3 Months Ended
Jan. 31, 2018
Jul. 26, 2017
Jan. 26, 2017
Mar. 31, 2018
Mar. 31, 2017
Dec. 05, 2017
Common Stock            
Stock repurchase program, authorized amount           $ 5,000,000,000.0
Common stock dividends declared (in dollars per share) $ 0.12 $ 0.12 $ 0.075      
Common stock repurchased       $ 4,858,000,000 $ 2,728,000,000  
Share-based compensation, number of shares authorized (in shares)       804    
Common Stock            
Common Stock            
Stock issued (in shares)       66    
Shares paid for tax withholding for share based compensation (in shares)       25    
Warrants Expiring October 18, 2018            
Common Stock            
Warrants outstanding (in shares)       122    
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)       142    
Minimum required dividend rate (in dollars per share)       $ 0.01    
Exercise price per warrant (in dollars per share)       $ 12.713    
2017 CCAR            
Common Stock            
Stock repurchase program, authorized amount       $ 12,000,000,000    
2017 CCAR | Common Stock            
Common Stock            
Common stock repurchased (in shares)       153    
Common stock repurchased       $ 4,900,000,000    
2017 CCAR, Equity-Based Compensation Plan Effect Offset            
Common Stock            
Stock repurchase program, authorized amount       $ 900,000,000