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Long-Term Debt (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Debt Instrument [Line Items]        
Maximum Borrowing Capacity $ 1,500 $ 1,500    
Outstanding borrowing 0 0    
Repayments of Long-term Debt   $ 455 $ 0  
Five Point Eight Seven Five Percent Senior Notes Due Two Thousand Sixteen [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage       5.875%
Repayments of Long-term Debt $ 455      
Six Point Six Five Percent Senior Notes Due Two Thousand Seventeen [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Interest Rate, Stated Percentage 6.65% 6.65%    
Senior Notes $ 485 $ 485