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Preferred and Common Stock - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Mar. 31, 2014
Class of Stock [Line Items]          
Transaction date of public offering     Jul. 30, 2014    
Public offering of preferred stock     $ 1,250    
Depository shares     25,000,000    
Interest in preferred stock 0.1   0.1    
Proceeds from public offering     $ 1,213    
Preferred stock dividend declared $ 0.09375 $ 1.875 $ 2.8125 $ 3.75  
Common stock shares, issued 1,267,290,820   1,267,290,820    
Common stock shares, Authorized         1,800,000,000
Common stock shares, outstanding 1,177,672,033   1,177,672,033    
5.25% Convertible Notes Due March 15, 2014 [Member]
          
Class of Stock [Line Items]          
Common stock shares, issued         89
Common stock shares         $ 1
Debt Instrument, Interest Rate, Stated Percentage         5.25%
IPO [Member]
          
Class of Stock [Line Items]          
Underwriter 30-day common stock options     30 days    
IPO [Member] | Depository Shares [Member]
          
Class of Stock [Line Items]          
Additional shares granted     3,750,000    
Maximum [Member]
          
Class of Stock [Line Items]          
Preferred stock conversion price $ 30.9406   $ 30.9406    
Minimum [Member]
          
Class of Stock [Line Items]          
Preferred stock conversion price $ 25.7838   $ 25.7838    
Class B Mandatory Convertible Preferred Stock [Member]
          
Class of Stock [Line Items]          
Percentage ownership     5.375%    
Preferred stock issued 10,000,000   10,000,000    
Mandatory Convertible Preferred Stock [Member]
          
Class of Stock [Line Items]          
Preferred stock par value $ 1   $ 1    
Preferred stock liquidation preference $ 500   $ 500    
Preferred share 2,500,000   2,500,000    
Preferred stock dividend declared     $ 26.8750    
Percentage redemption of preferred shares     101.00%    
Termination date of preferred stock     Apr. 01, 2015    
Preferred stock conversion date     Oct. 01, 2017    
Mandatory Convertible Preferred Stock [Member] | IPO [Member]
          
Class of Stock [Line Items]          
Additional shares granted     375,000    
Mandatory Convertible Preferred Stock [Member] | Maximum [Member]
          
Class of Stock [Line Items]          
Preferred stock conversion price $ 30.9406   $ 30.9406    
Mandatory Convertible Preferred Stock [Member] | Minimum [Member]
          
Class of Stock [Line Items]          
Preferred stock conversion price $ 25.2994   $ 25.2994    
Mandatory Convertible Preferred Stock [Member] | Minimum [Member] | Anti - Dilution Adjustments [Member]
          
Class of Stock [Line Items]          
Preferred stock conversion price $ 25.7838   $ 25.7838