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Other Assets, Net (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Assets, Net      
Debt issue costs $ 69 $ 53  
Fair value of derivative instruments 10 20  
Intangible assets 642 498  
Other 54 59  
Other assets, gross 775 630  
Accumulated amortization (189) (84)  
Other assets, net 586 546  
Debt issuance costs capitalized during the period 20 18  
Write off of debt issuance cost 5 11  
Amortization expense related to other assets (including finite-lived intangible assets) 110 44 22
Amortization expense for finite-lived intangible assets 101 36 14
Finite-Lived Intangible Assets      
Cost 642 498  
Accumulated amortization (169) (68)  
Net 473 430  
Estimated amortization expense related to finite-lived intangible assets for the next five years      
2013 78    
2014 53    
2015 48    
2016 42    
2017 40    
Customer contracts and relationships
      
Other Assets, Net      
Intangible assets 558 426  
Finite-Lived Intangible Assets      
Cost 558 426  
Accumulated amortization (157) (61)  
Net 401 365  
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
      
Other Assets, Net      
Intangible assets 38 38  
Finite-Lived Intangible Assets      
Cost 38 38  
Accumulated amortization (10) (6)  
Net 28 32  
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
      
Other Assets, Net      
Intangible assets 38 26  
Finite-Lived Intangible Assets      
Cost 38 26  
Accumulated amortization (2) (1)  
Net 36 25  
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
      
Other Assets, Net      
Intangible assets 8 8  
Finite-Lived Intangible Assets      
Cost 8 8  
Net $ 8 $ 8