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Long-Term Debt and Commercial Paper (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Payments of mortgage facilities   $ 22,500,000 $ 9,800,000 $ 9,200,000
Debt Issuance Costs, Net     10,100,000  
Commercial Paper Maximum Aggregate Amount $ 1,000,000,000 1,000,000,000    
Letters of credit, amount outstanding 44,100,000 44,100,000    
Commercial paper $ 942,000,000 $ 942,000,000 599,500,000  
Credit Agreement Due 2019 [Member]        
Debt Instrument [Line Items]        
Impact on credit spread from increase in leverage ratio 0.125% 0.125%    
Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Debt instrument, maturity date   Dec. 03, 2019    
Additional borrowing capacity under accordion feature of revolving credit facility $ 500,000,000 $ 500,000,000    
Maximum borrowing capacity under revolving credit facility 1,800,000,000 1,800,000,000    
Revolving credit facility, amount outstanding 0 0 0  
Revolving credit facilities letter of credit sublimit 200,000,000 200,000,000    
Additional borrowing capacity under revolving credit facility 1,800,000,000 1,800,000,000    
Borrowing capacity limited under the maximum consolidated leverage ratio $ 1,100,000,000 $ 1,100,000,000    
Leverage ratio, minimum threshold, current credit spread 2.0 2.0    
Leverage ratio, maximum threshold, current credit spread 3.25 3.25    
Leverage ratio, minimum threshold, increase in credit spread 3.25 3.25    
Senior Notes [Member] | Senior Notes at Six Point Seven Five Percent due 2018 [Member]        
Debt Instrument [Line Items]        
Senior notes $ 400,000,000 $ 400,000,000 400,000,000  
Percentage interest on debt instrument 6.75% 6.75%    
Debt instrument, maturity date   Apr. 15, 2018    
Senior Notes [Member] | Senior Notes at Five Point Five Percent Due 2020 [Member]        
Debt Instrument [Line Items]        
Senior notes $ 350,000,000 $ 350,000,000 350,000,000  
Percentage interest on debt instrument 5.50% 5.50%    
Debt instrument, maturity date   Feb. 01, 2020    
Senior Notes [Member] | Senior Notes at Three Point Three Five Percent Due 2021 [Member]        
Debt Instrument [Line Items]        
Senior notes $ 300,000,000 $ 300,000,000 300,000,000  
Percentage interest on debt instrument 3.35% 3.35%    
Debt instrument, maturity date   Jan. 15, 2021    
Senior Notes [Member] | Senior Notes at Four Point Five Percent Due 2025 [Member]        
Debt Instrument [Line Items]        
Senior notes $ 450,000,000 $ 450,000,000 $ 450,000,000  
Percentage interest on debt instrument 4.50% 4.50%    
Debt instrument, maturity date   Oct. 01, 2025    
Secured Debt [Member] | Mortgage Facility [Member]        
Debt Instrument [Line Items]        
Debt instrument, maturity date   Nov. 30, 2017    
Minimum [Member] | Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Commitment fee on undrawn amounts   0.175%    
Maximum [Member] | Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Commitment fee on undrawn amounts   0.25%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates   1.25%    
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates   1.625%    
Base Rate [Member] | Minimum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates   0.25%    
Base Rate [Member] | Maximum [Member] | Line of Credit [Member] | Revolving Credit Facility Due 2019 [Member]        
Debt Instrument [Line Items]        
Basis spread on variable interest rates   0.625%    
Commercial Paper [Member]        
Debt Instrument [Line Items]        
Short-term Debt, Weighted Average Interest Rate 1.26% 1.26%    
Commercial Paper [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Term   397 days    
Commercial Paper [Member] | Weighted Average [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Term   24 days    
Domestic Stores Divested [Member] | Secured Debt [Member] | Mortgage Facility [Member]        
Debt Instrument [Line Items]        
Payments of mortgage facilities $ 12,100,000      
Mortgage facility, make-whole payment $ 500,000