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Long-term Debt (Details) - USD ($)
3 Months Ended
May 01, 2018
Mar. 31, 2018
Mar. 31, 2017
Debt Instrument [Line Items]      
Aggregate loan commitments   $ 1,500,000,000  
Outstanding borrowing   0  
Repayments   $ 0 $ 485,000,000
6.65% Senior notes      
Debt Instrument [Line Items]      
Stated interest rate     6.65%
Repayments     $ 485,000,000
6.875% Senior notes      
Debt Instrument [Line Items]      
Stated interest rate   6.875%  
Subsequent event | 6.875% Senior notes      
Debt Instrument [Line Items]      
Stated interest rate 6.875%    
Repayments $ 450,000,000