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Consolidated Statement Of Changes In Equity (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]      
Cash dividends declared, per share $ 1.22us-gaap_CommonStockDividendsPerShareDeclared $ 1.18us-gaap_CommonStockDividendsPerShareDeclared $ 1.14us-gaap_CommonStockDividendsPerShareDeclared