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Consolidated Balance Sheets (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Statement of Financial Position [Abstract]    
Preferred stock, no par value      
Preferred stock, authorized 1,000,000us-gaap_PreferredStockSharesAuthorized 1,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized 1,200,000,000us-gaap_CommonStockSharesAuthorized 1,200,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued 355,200,000us-gaap_CommonStockSharesIssued 354,300,000us-gaap_CommonStockSharesIssued
Treasury stock, shares 700,000us-gaap_TreasuryStockShares