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Subsequent Event (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended
Sep. 09, 2015
Aug. 17, 2015
Aug. 01, 2015
Subsequent Event [Line Items]      
Estimated Additional Company Contribution to Settle Pension Plan Liabilities     $ 210
Dividend Declared [Member]      
Subsequent Event [Line Items]      
Common stock cash dividends per share, declared   $ 0.40  
Common stock cash dividends per share, declared date Aug. 17, 2015    
Common stock cash dividends per share, paid date Sep. 09, 2015    
Common stock cash dividends per share, date of record Aug. 28, 2015