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Commitments & Contingencies (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Loss Contingencies [Line Items]    
Accrued liabilities for remediation $ 119 $ 117
Receivables for recoverable costs 48 51
Contractual commitments to acquire property, plant and equipment and advance funds to equity method investees 231  
Master Shelf Agreement [Member]
   
Loss Contingencies [Line Items]    
Credit agreement expiration date Dec. 31, 2024  
Indemnification Agreement [Member] | Predecessor [Member]
   
Loss Contingencies [Line Items]    
Guarantee obligation current carrying value 12  
TAME [Member] | Standby Letters Of Credit [Member]
   
Loss Contingencies [Line Items]    
Maximum potential undiscounted payments 25  
Credit agreement expiration date Dec. 31, 2018  
Equity Method Investees [Member]
   
Loss Contingencies [Line Items]    
GuaranteeObligationsMaximumExposurePerEvent 50  
Equity Method Investees [Member] | Guarantee Type, Other [Member]
   
Loss Contingencies [Line Items]    
Maximum potential undiscounted payments 108  
Loop And Locap Llc [Member] | Financial Guarantee [Member]
   
Loss Contingencies [Line Items]    
Maximum potential undiscounted payments 172  
Centennial [Member] | Financial Guarantee [Member]
   
Loss Contingencies [Line Items]    
Maximum potential undiscounted payments 49  
Kentucky Lawsuit [Member]
   
Loss Contingencies [Line Items]    
Loss contingency, inestimable loss Management does not believe the ultimate resolution of this litigation will have a material adverse effect on our business, financial condition, results of operations or cash flows.  
Kentucky Lawsuit [Member] | Pending Or Threatened Litigation [Member]
   
Loss Contingencies [Line Items]    
Alleged amount overcharged from customers $ 89