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, 2013
Dec. 31, 2012
Treasury stock, shares 1 1
Class A common stock
   
Common stock, shares issued 218 225
Class B common stock
   
Common stock, shares issued 721 729