Quarterly report pursuant to Section 13 or 15(d)

CONSOLIDATED BALANCE SHEETS (Parenthetical)

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CONSOLIDATED BALANCE SHEETS (Parenthetical)
In Millions, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Treasury stock, shares 1 1    
Class A common stock
       
Common stock, shares issued 208 212 218 225
Class B common stock
       
Common stock, shares issued 707 712 721 729