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Debt Long-Term Debt (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Jul. 31, 2013
Mar. 31, 2011
Feb. 03, 2018
Jan. 28, 2017
Jul. 16, 2013
Debt Instrument [Line Items}          
Derivative Liability, Fair Value, Gross Liability     $ (13) $ (3)  
Less: current portion     (544) (44)  
Long-Term Debt     811 1,321  
Future maturities of long-term debt, including capitalized leases          
2019     499    
2020     0    
2021     0    
2022     646    
2023     0    
Thereafter     0    
Notes due 2018 [Member]          
Debt Instrument [Line Items}          
Long-term Debt     $ 500 500  
Debt instrument issued, principal amount         $ 500
Interest rate (as a percent)         5.00%
Underwriting discounts $ 5        
Net proceeds from the sale of the Notes $ 495        
Redemption price, as percentage of principal amount of debt instrument (as a percent)     100.00%    
Debt Instrument, Treasury Rate Basis Points for Redemption     50    
Redemption price upon control triggering event, percentage of principal amount (as a percent)     101.00%    
Notes due 2021 [Member]          
Debt Instrument [Line Items}          
Long-term Debt     $ 650 650  
Debt instrument issued, principal amount   $ 650      
Interest rate (as a percent)     5.50%    
Underwriting discounts   4      
Net proceeds from the sale of the Notes   $ 644      
Redemption price, as percentage of principal amount of debt instrument (as a percent)     100.00%    
Redemption price upon control triggering event, percentage of principal amount (as a percent)     101.00%    
Interest Rate Swap [Member]          
Debt Instrument [Line Items}          
Long-term Debt       13  
Long-term Debt [Member]          
Debt Instrument [Line Items}          
Long-term debt, excluding debt discounts and issuance costs and financing and capital lease obligations     $ 1,145 1,163  
Debt discounts and issuance costs     (3) (5)  
Financing lease obligations     191 177  
Capital lease obligations     22 30  
Long-term Debt and Capital Lease Obligations, Including Current Maturities     1,355 1,365  
Less: current portion     (544) (44)  
Long-Term Debt     811 1,321  
Long-term debt, fair value     1,199 1,240  
Interest Rate Swap [Member]          
Debt Instrument [Line Items}          
Derivative Liability, Fair Value, Gross Liability [1]       $ 0  
Interest Rate Swap [Member] | Long-term Debt [Member]          
Debt Instrument [Line Items}          
Derivative Liability, Fair Value, Gross Liability [1]     $ (5)    
[1] The fair value is recorded in Other assets or Long-term liabilities on our Consolidated Balance Sheets.