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Leases, Rental Expense, Net of Sublease Rental Income (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Rental Expense, Net of Sublease Income  
Minimum rental expense $ 515
Contingent rental expense 19
Total rental expense 534
Less: Sublease rental income 31
Rental expense, net of sublease rental income $ 503