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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Mar. 31, 2013
Dec. 31, 2012
Statement Of Financial Position [Abstract]    
Common shares, par value $ 1 $ 1
Common shares, shares Authorized 1,400,000,000 1,400,000,000
Common shares, shares issued 349,100,000 349,000,000
Common shares, shares outstanding 349,100,000 349,000,000
Preferred shares, shares authorized 1,000,000 1,000,000
Preferred shares, shares issued 0 0
Preferred shares, shares outstanding 0 0