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Stockholders' Equity - Additional Information (Detail) (USD $)
In Millions, except Share data, unless otherwise specified
Dec. 31, 2011
Year
Dec. 31, 2010
Stockholders Equity Note [Line Items]    
Convertible preferred stock, shares authorized 100,000,000 100,000,000
Convertible preferred stock, par value $ 0.001 $ 0.001
Convertible preferred stock, shares issued      
Convertible preferred stock, shares outstanding      
Number of authorized classes of common stock 2  
Common stock, shares authorized 9,000,000,000 9,000,000,000
Common stock, shares outstanding 324,895,000 321,301,000
Stock Plans, shares of common stock reserved for future issuance 21,794,492 27,329,837
Warrants held by selected financial institutions that were options purchased from employees under our Transferable Stock Option (TSO) program 1,200,000  
Warrants held by selected financial institutions that were options purchased from employees under our Transferable Stock Option (TSO) program, weighted-average exercise price $ 336.64  
Warrants held by selected financial institutions that were options purchased from employees under our Transferable Stock Option (TSO) program, weighted-average remaining life (in years) 1.1  
Class A Common Stock
    
Stockholders Equity Note [Line Items]    
Common stock, shares authorized 6,000,000,000  
Common stock, shares outstanding 257,552,401 250,413,000
Common stock, entitled votes per share 1  
Class B Common Stock
    
Stockholders Equity Note [Line Items]    
Common stock, shares authorized 3,000,000,000  
Common stock, shares outstanding 67,342,362 70,888,000
Common stock, entitled votes per share 10  
Employee stock options
    
Stockholders Equity Note [Line Items]    
Unrecognized compensation cost $ 583  
Unrecognized compensation cost related to stock awards, weighted-average period (in years) 2.1  
Restricted Stock Units (RSUs)
    
Stockholders Equity Note [Line Items]    
Unrecognized compensation cost $ 3,727  
Unrecognized compensation cost related to stock awards, weighted-average period (in years) 2.9