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Schedule Of Rent Expense (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rent and minimum concession fees $ 709 $ 715 $ 699
Contingent concession expense 273 221 214
Rent and contingent concession expense 982 936 913
Less: sublease rental income (5) (4) (5)
Total $ 977 $ 932 $ 908