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Consolidated Statements Of Changes In Equity (Parenthetical) - $ / shares
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dividends declared per common share $ 0.50 $ 0.46 $ 0.42
Retained Earnings [Member]      
Dividends declared per common share $ 0.50 $ 0.46 $ 0.42