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Other Long-Term Assets, Net - Intangible Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Finite-Lived Intangible Assets    
Cost $ 610 $ 644
Accumulated Amortization (327) (299)
Net 283 345
Estimated amortization expense related to finite-lived intangible assets for the next five years    
2016 44  
2017 41  
2018 36  
2019 33  
2020 31  
Customer contracts and relationships    
Finite-Lived Intangible Assets    
Cost 537 565
Accumulated Amortization (301) (277)
Net $ 236 288
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 (22) (18)
Net $ 16 20
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 $ 28 33
Accumulated Amortization (4) (4)
Net $ 24 29
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 8
Net $ 7 $ 8