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Debt - Components of Long Term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended
Apr. 30, 2018
May 05, 2018
Feb. 03, 2018
Apr. 29, 2017
Debt Instrument [Line Items]        
Unamortized debt discount   $ 14 $ 18 $ 20
Long-term Debt, Fair Value   2,300 2,900 2,800
Loss on extinguishment of debt   42    
Premiums paid to holders as a result of tender offer   $ 35    
Senior Notes        
Debt Instrument [Line Items]        
Effective Rate   4.76%    
Total senior debt   $ 2,315 2,815 2,815
Cash tender offer amount $ 500      
Loss on extinguishment of debt   42    
Premiums paid to holders as a result of tender offer   35    
Non cash write off of interest rate hedge on tendered debt   4    
Non cash write off of deferred financing costs and original issue discounts on extinguished debt   $ 3    
Senior Notes | Senior Notes Due 2021 [Member]        
Debt Instrument [Line Items]        
Effective Rate   4.81%    
Debt Instrument, Interest Rate, Stated Percentage   4.00%    
Total senior debt   $ 426 650 650
Senior Notes | Senior Notes Due 2023 [Member]        
Debt Instrument [Line Items]        
Effective Rate   3.25%    
Debt Instrument, Interest Rate, Stated Percentage   3.25%    
Total senior debt   $ 350 350 350
Senior Notes | Senior Notes 4.78% Due 2023 [Member]        
Debt Instrument [Line Items]        
Effective Rate   4.78%    
Debt Instrument, Interest Rate, Stated Percentage   4.75%    
Total senior debt   $ 184 300 300
Senior Notes | Senior Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Effective Rate   4.25%    
Debt Instrument, Interest Rate, Stated Percentage   4.25%    
Total senior debt   $ 650 650 650
Senior Notes | Senior Notes Due 2029 [Member]        
Debt Instrument [Line Items]        
Effective Rate   7.36%    
Debt Instrument, Interest Rate, Stated Percentage   7.25%    
Total senior debt   $ 42 99 99
Senior Notes | Senior Notes Due 2033 [Member]        
Debt Instrument [Line Items]        
Effective Rate   6.05%    
Debt Instrument, Interest Rate, Stated Percentage   6.00%    
Total senior debt   $ 112 166 166
Senior Notes | Senior Notes Due 2037 [Member]        
Debt Instrument [Line Items]        
Effective Rate   6.89%    
Debt Instrument, Interest Rate, Stated Percentage   6.88%    
Total senior debt   $ 101 150 150
Senior Notes | Senior Notes Due 2045 [Member]        
Debt Instrument [Line Items]        
Effective Rate   5.57%    
Debt Instrument, Interest Rate, Stated Percentage   5.55%    
Total senior debt   $ 450 $ 450 $ 450