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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Current assets:    
Accounts receivable, allowances for doubtful accounts $ 68 $ 39
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.000006 $ 0.000006
Class A Common Stock    
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.000006  
Common stock, shares authorized 5,000,000,000 5,000,000,000
Common stock, shares, issued 2,293,000,000 2,234,000,000
Common stock, shares, outstanding 2,293,000,000 2,234,000,000
Common stock, outstanding shares subject to repurchase 8,000,000 13,000,000
Class B Common Stock    
Stockholders' equity:    
Common stock, par value (in dollars per share) $ 0.000006  
Common stock, shares authorized 4,141,000,000 4,141,000,000
Common stock, shares, issued 552,000,000 563,000,000
Common stock, shares, outstanding 552,000,000 563,000,000
Common stock, outstanding shares subject to repurchase 3,000,000 6,000,000