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 6 Months Ended
Jul. 23, 2015
Apr. 16, 2015
Mar. 11, 2015
Feb. 10, 2015
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2015
Jun. 30, 2014
Class of Stock [Line Items]                
Common stock dividends declared (in usd per share)   $ 0.05   $ 0.05        
Common stock repurchased             $ 775 $ 1,675
Share-based compensation, number of shares authorized (shares)         1,800,000,000   1,800,000,000  
Preferred stock dividends         $ 330 $ 382 $ 712 $ 494
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)         $ 13.171   $ 13.171  
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          
Stock Repurchase Program, Required Quarterly Dividend Rate     $ 0.05          
Stock repurchase period     15 months          
Common stock repurchased (in shares)         48,700,000      
Common stock repurchased         $ 775      
Subsequent Event                
Class of Stock [Line Items]                
Common stock dividends declared (in usd per share) $ 0.05