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Capital Stock (Capital stock) (Details)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Class A Common Stock
       
Common Stock, Shares Authorized 1,000,000,000 1,000,000,000    
Common Stock, Shares, Outstanding 331,832,000 330,653,000 334,245,000 332,567,000
Class B Common Stock, Class B1 [Member]
       
Common Stock, Shares, Outstanding 600 600    
Class B Common Stock, Class B2 [Member]
       
Common Stock, Shares, Outstanding 800 800    
Class B Common Stock, Class B3 [Member]
       
Common Stock, Shares, Outstanding 1,300 1,300    
Class B Common Stock, Class B4 [Member]
       
Common Stock, Shares, Outstanding 400 400