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Commitments And Contingencies (Leases, Schedule of Rent Expense) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Leases [Abstract]        
Operating Leases, Rent Expense, Contingent Rentals $ 1 $ 3 $ 3 $ 13
Operating Leases, Rent Expense, Sublease Rentals 11 7 28 19
Cash rent:        
Store base rent 19 16 52 51
Equipment and other rent 1 4 2 10
Total cash rent 20 20 54 61
Non-cash rent:        
Straight-line rent 0 0 0 1
Net rent expense $ 20 $ 20 $ 54 $ 62