Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical) - shares
shares in Millions
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Dec. 31, 2013
Treasury stock, shares 1 1    
Class A common stock        
Common stock, shares issued 199 201 208 212
Class B common stock        
Common stock, shares issued 698 705 707 712