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Commitments and Contingencies (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Future Minimum Rental Payments      
2018 $ 359    
2019 236    
2020 148    
2021 104    
2022 74    
Thereafter 366    
Total minimum rental payments 1,287    
Minimum rentals to be received under subleases 15    
Rental Expense, Net of Sublease Rental Income      
Minimum rental expense 691 $ 739 $ 732
Contingent rental expense 21 70 105
Total rental expense 712 809 837
Less sublease rental income 54 31 46
Rental expense, net of sublease rental income $ 658 $ 778 $ 791