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Long-Term Debt (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Rate
Debt Instrument [Line Items]  
Maximum Borrowing Capacity $ 1,500
Document Period End Date Sep. 30, 2015
Outstanding borrowing $ 0
Five Point Eight Seven Five Percent Senior Notes Due Two Thousand Sixteen [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage | Rate 5.875%
Senior Notes $ 455