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Statement of Consolidated Changes in Equity (Unaudited) (Parenthetical) (USD $)
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Common stock, dividends, per share $ 0.25us-gaap_CommonStockDividendsPerShareDeclared $ 0.25us-gaap_CommonStockDividendsPerShareDeclared
Retained Earnings [Member]    
Common stock, dividends, per share $ 0.25us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember		 $ 0.25us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Parent [Member]    
Common stock, dividends, per share $ 0.25us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember		 $ 0.25us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_ParentMember