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 6 Months Ended
Jul. 26, 2018
Apr. 25, 2018
Jan. 31, 2018
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 28, 2018
Common Stock              
Common stock dividends declared (in dollars per share)   $ 0.12 $ 0.12        
Common stock repurchased         $ 9,823,000,000 $ 4,964,000,000  
Share-based compensation, number of shares authorized (in shares)       801 801    
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)       122 122    
Minimum required dividend rate (in dollars per share)       $ 0.32 $ 0.32    
Exercise price per warrant (in dollars per share)       $ 30.79 $ 30.79    
Warrants Expiring January 16, 2019              
Common Stock              
Warrants outstanding (in shares)       138 138    
Minimum required dividend rate (in dollars per share)       $ 0.01 $ 0.01    
Exercise price per warrant (in dollars per share)       $ 12.666 $ 12.666    
2018 CCAR              
Common Stock              
Stock repurchase program, authorized amount             $ 20,600,000,000
2018 CCAR, Equity-Based Compensation Plan Effect Offset              
Common Stock              
Stock repurchase program, authorized amount             $ 600,000,000
2017 CCAR | Common Stock              
Common Stock              
Common stock repurchased (in shares)       165 318    
Common stock repurchased       $ 5,000,000,000 $ 9,800,000,000    
Subsequent Event              
Common Stock              
Common stock dividends declared (in dollars per share) $ 0.15