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Commitments and Contingencies (Leases, Schedule of Rent Expense) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leased Assets [Line Items]      
Store base rent $ 66 $ 66 $ 67
Equipment rent 14 14 12
Total cash rent 80 80 79
Straight-line rent 1 1 0
Net rent expense 81 81 79
Sublease rentals 25 25 26
Contingent rentals $ 16 $ 18 $ 20