Annual report pursuant to Section 13 and 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 12 Months Ended
Jan. 26, 2017
Oct. 27, 2016
Jul. 27, 2016
Jun. 29, 2016
Apr. 27, 2016
Mar. 18, 2016
Jan. 21, 2016
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Jan. 13, 2017
Class of Stock [Line Items]                            
Quarterly dividend rate (in dollars per share)   $ 0.075 $ 0.075   $ 0.05   $ 0.05   $ 0.075 $ 0.05        
Common stock repurchased                     $ 5,112,000,000 $ 2,374,000,000 $ 1,675,000,000  
Cash paid per common share (in dollars per share)               $ 0.075   $ 0.05 $ 0.25 $ 0.20 $ 0.12  
Share-based compensation, number of shares authorized (in shares)               1,600     1,600      
Common Stock                            
Class of Stock [Line Items]                            
Stock issued (in shares)                     9      
Shares paid for tax withholding for share based compensation (in shares)                     4      
Series T Preferred Stock                            
Class of Stock [Line Items]                            
Warrants outstanding (in shares)               700     700      
Exercise price per warrant (in dollars per share)               $ 7.142857     $ 7.142857      
Per annum dividend rate                     6.00%      
Warrants Expiring October 18, 2018                            
Class of Stock [Line Items]                            
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                            
Class of Stock [Line Items]                            
Warrants outstanding (in shares)               150     150      
Minimum required dividend rate (in dollars per share)               $ 0.01     $ 0.01      
Exercise price per warrant (in dollars per share)               $ 12.938     $ 12.938      
Subsequent Event                            
Class of Stock [Line Items]                            
Quarterly dividend rate (in dollars per share) $ 0.075                          
Other authorized repurchases                            
Class of Stock [Line Items]                            
Shares authorized to be repurchased, amount       $ 5,000,000,000                    
Other authorized repurchases | Common Stock                            
Class of Stock [Line Items]                            
Common stock repurchased (in shares)                     55 0 0  
Common stock repurchased           $ 800,000,000         $ 800,000,000 $ 0 $ 0  
Other authorized repurchases | Subsequent Event | Common Stock                            
Class of Stock [Line Items]                            
Shares authorized to be repurchased, amount                           $ 1,800,000,000
2016 CCAR Capital Plan                            
Class of Stock [Line Items]                            
Period of stock repurchase program       12 months                    
2015 CCAR Capital Plan                            
Class of Stock [Line Items]                            
Common stock repurchased                     $ 1,600,000,000      
2015 CCAR Capital Plan | Common Stock                            
Class of Stock [Line Items]                            
Common stock repurchased (in shares)                     113