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Other Long-Term Assets, Net - Intangible Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Finite-Lived Intangible Assets    
Cost $ 1,209 $ 1,265
Accumulated Amortization (437) (421)
Net 772 844
Estimated amortization expense related to finite-lived intangible assets for the next five years    
2019 70  
2020 75  
2021 75  
2022 73  
2023 68  
Customer contracts and relationships    
Finite-Lived Intangible Assets    
Cost 1,152 1,188
Accumulated Amortization (413) (383)
Net $ 739 805
Customer contracts and relationships | Minimum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 1 year  
Customer contracts and relationships | Maximum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 20 years  
Property tax abatement    
Finite-Lived Intangible Assets    
Cost $ 23 38
Accumulated Amortization (16) (30)
Net $ 7 8
Property tax abatement | Minimum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 7 years  
Property tax abatement | Maximum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 13 years  
Other agreements    
Finite-Lived Intangible Assets    
Cost $ 34 39
Accumulated Amortization (8) (8)
Net $ 26 $ 31
Other agreements | Minimum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 25 years  
Other agreements | Maximum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 70 years