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Statements of Changes in Consolidated Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
Cash dividends on common stock per share $ 0.72us-gaap_CommonStockDividendsPerShareCashPaid $ 0.72us-gaap_CommonStockDividendsPerShareCashPaid $ 0.72us-gaap_CommonStockDividendsPerShareCashPaid