Quarterly report pursuant to Section 13 or 15(d)

Shareholders' Equity (Details)

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Shareholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Oct. 22, 2015
Jul. 23, 2015
Apr. 16, 2015
Mar. 11, 2015
Feb. 10, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2015
Sep. 30, 2014
Class of Stock [Line Items]                    
Common stock dividends declared (in usd per share)   $ 0.05 $ 0.05   $ 0.05          
Common stock repurchased                 $ 1,575 $ 1,675
Share-based compensation, number of shares authorized (shares)           1,600,000,000     1,600,000,000  
Preferred stock dividends           $ 441 $ 330 $ 382 $ 1,153 $ 732
Key Associate Stock Plan | Restricted Stock Units (RSUs)                    
Class of Stock [Line Items]                    
Awards granted in period                 131,000,000  
Restricted stock units authorized to be converted to common stock upon vesting (shares)           2,000,000     2,000,000  
Key Associate Stock Plan | Restricted Stock Units (RSUs) | Anniversary One                    
Class of Stock [Line Items]                    
Vesting percentage                 33.00%  
Key Associate Stock Plan | Restricted Stock Units (RSUs) | Anniversary Two                    
Class of Stock [Line Items]                    
Vesting percentage                 33.00%  
Key Associate Stock Plan | Restricted Stock Units (RSUs) | Anniversary Three                    
Class of Stock [Line Items]                    
Vesting percentage                 33.00%  
Warrants Expiring January 16, 2019                    
Class of Stock [Line Items]                    
Warrants outstanding           150,400,000     150,400,000  
Minimum required dividend rate (in usd per share)           $ 0.01     $ 0.01  
Exercise price per warrant (in usd per share)           $ 13.137     $ 13.137  
Warrants Expiring October 28, 2018                    
Class of Stock [Line Items]                    
Warrants outstanding           121,800,000     121,800,000  
Minimum required dividend rate (in usd per share)           $ 0.32     $ 0.32  
Common Stock                    
Class of Stock [Line Items]                    
Stock issued (shares)                 7,000,000  
Shares paid for tax withholding for share based compensation (shares)                 3,000,000  
2015 Capital Plan                    
Class of Stock [Line Items]                    
Requested stock repurchase (in shares)       4,000,000,000            
Required quarterly dividend rate       $ 0.05            
Stock repurchase period       15 months            
Common stock repurchased (in shares)           44,600,000     93,200,000  
Common stock repurchased           $ 800     $ 1,600  
Subsequent Event                    
Class of Stock [Line Items]                    
Common stock dividends declared (in usd per share) $ 0.05