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
Mar. 11, 2015
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Stock [Line Items]                
Redemption of stock (in shares)             101.1 231.7
Redemption of stock           $ 2,374,000,000 $ 1,675,000,000 $ 3,220,000,000
Cash paid per common share (in dollars per share)   $ 0.05 $ 0.05 $ 0.05 $ 0.05 $ 0.20 $ 0.12 $ 0.04
Share-based compensation, number of shares authorized (in shares)   1,600.0       1,600.0    
Series T Preferred Stock                
Class of Stock [Line Items]                
Warrants outstanding (in shares)   700.0       700.0    
Exercise price per warrant (in dollars per share)   $ 7.142857       $ 7.142857    
Per annum dividend rate           6.00%    
Common Stock                
Class of Stock [Line Items]                
Stock issued (in shares)           7.0    
Shares paid for tax withholding for share based compensation (in shares)           3.0    
Warrants Expiring January 16, 2019                
Class of Stock [Line Items]                
Warrants outstanding (in shares)   150.4       150.4    
Exercise price per warrant (in dollars per share)   $ 13.107       $ 13.107    
Minimum required dividend rate (in dollars per share)   $ 0.01       $ 0.01    
Warrants Expiring October 18, 2018                
Class of Stock [Line Items]                
Warrants outstanding (in shares)   121.8       121.8    
Exercise price per warrant (in dollars per share)   $ 30.79       $ 30.79    
Minimum required dividend rate (in dollars per share)   $ 0.32       $ 0.32    
2015 Capital Plan                
Class of Stock [Line Items]                
Shares authorized to be repurchased $ 4,000,000,000              
Period of stock repurchase program 15 months              
Quarterly dividend rate (in dollars per share) $ 0.05              
Redemption of stock (in shares)           140.3    
Redemption of stock           $ 2,400,000,000