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Consolidated Balance Sheets (Parenthetical) (EUR €)
Dec. 31, 2011
Dec. 31, 2010
Consolidated Balance Sheets [Abstract]    
Preferred stock, shares authorized 540,000,000 540,000,000
Preferred stock, shares Issued 0 0
Common stock, nominal value € 1.04 € 1.04
Common stock, shares authorized 1,200,000,000 1,200,000,000
Common stock, shares issued 910,559,805 910,559,805
Common stock, shares outstanding 884,995,094 881,686,303