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Commitments and Contingencies (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]      
Rental expense, net of sublease income $ 108,000,000 $ 94,000,000 $ 84,000,000
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2019 131,000,000    
2020 120,000,000    
2021 112,000,000    
2022 101,000,000    
2023 54,000,000    
Beyond 204,000,000    
Purchase Obligation, Fiscal Year Maturity [Abstract]      
Total payments expected under purchase arrangements 124,000,000    
Total payments expected in 2019 92,000,000    
Total payments expected in 2020 16,000,000    
Total payments expected in 2021 12,000,000    
Total payments expected in 2022 3,000,000    
Total payments expected in 2023 1,000,000    
Remaining contract payments 114,000,000    
Accrued portion of the amount of indemnification under agreements $ 0