Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity - Narrative (Details)

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Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Aug. 24, 2017
Jul. 26, 2017
Apr. 26, 2017
Jan. 26, 2017
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Common Stock              
Common stock repurchased           $ 7,945 $ 3,782
Common stock dividends declared (in dollars per share)   $ 0.12 $ 0.075 $ 0.075 $ 0.12    
Share-based compensation, number of shares authorized (in shares)         873,000,000 873,000,000  
Preferred Stock              
Preferred stock dividends           $ 1,292 $ 1,321
Series T Preferred Stock              
Common Stock              
Per Annum Dividend Rate 6.00%            
Carrying amount of stock $ 2,900            
Common Stock              
Common Stock              
Common stock issued in connection with exercise of warrants and exchange of preferred stock (in shares) 700,000,000            
Stock issued (in shares)           66,000,000  
Shares paid for tax withholding for share based compensation (in shares)           27,000,000  
Preferred Stock              
Preferred Stock              
Preferred stock dividends         $ 465 $ 1,300  
Shares issued (in shares)           0  
Warrants Expiring October 18, 2018              
Common Stock              
Warrants outstanding (in shares)         122,000,000 122,000,000  
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)         150,000,000 150,000,000  
Minimum required dividend rate (in dollars per share)         $ 0.01 $ 0.01  
Exercise price per warrant (in dollars per share)         $ 12.807 $ 12.807  
2017 CCAR | Common Stock              
Common Stock              
Common stock repurchased (in shares)         124,000,000    
Common stock repurchased         $ 3,000