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Commitments And Contingencies (Leases, Schedule of Rent Expense) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Cash rent:    
Store base rent $ 30 $ 28
Equipment and other rent 4 5
Total cash rent 34 33
Non-cash rent:    
Straight-line rent 0 0
Capital lease offset 0 0
Net rent expense 34 33
Store base rent, sublease rental income 6 6
Store base rent, contingent rent expense $ 5 $ 5