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Other Long-Term Assets, Net - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Finite-Lived Intangible Assets    
Cost $ 603 $ 610
Accumulated Amortization (361) (327)
Net 242 283
Estimated amortization expense related to finite-lived intangible assets for the next five years    
2017 42  
2018 37  
2019 34  
2020 32  
2021 30  
Customer contracts and relationships    
Finite-Lived Intangible Assets    
Cost 529 537
Accumulated Amortization (330) (301)
Net $ 199 236
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 $ 38 38
Accumulated Amortization (26) (22)
Net $ 12 16
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 $ 29 28
Accumulated Amortization (5) (4)
Net $ 24 24
Other agreements | Minimum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 25 years  
Other agreements | Maximum    
Finite-Lived Intangible Assets    
Estimated Useful Lives 70 years  
Emission reduction credits    
Finite-Lived Intangible Assets    
Cost $ 7 7
Net $ 7 $ 7