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Acquisitions and Dispositions (Details) (USD $)
 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2010
Oct. 31, 2011
BP NGL Acquisition
Y
Oct. 02, 2011
BP NGL Acquisition
bcfperday
railcar
barrel
mi
plant
barrelperday
Oct. 02, 2011
BP NGL Acquisition
Minimum
barrelperday
Oct. 02, 2011
BP NGL Acquisition
Maximum
barrelperday
May 31, 2011
Southern Pines Acquisition
Dec. 31, 2011
Southern Pines Acquisition
Feb. 09, 2011
Southern Pines Acquisition
Dec. 31, 2011
Southern Pines Acquisition
Minimum
Y
Dec. 31, 2011
Southern Pines Acquisition
Maximum
Y
Dec. 31, 2011
SG Resources Mississippi, LLC Project, Series 2009
Dec. 31, 2011
SG Resources Mississippi, LLC Project, Series 2010
Dec. 31, 2011
Other 2011 Acquisitions
Dec. 31, 2011
Western Acquisition
transaction
Dec. 29, 2011
Western Acquisition
mi
inch
Nov. 29, 2011
Gardendale Gathering System Acquisition
mi
Dec. 31, 2011
Additional 2011 acquisition
entity
Dec. 30, 2010
Nexen Acquisition
truckterminal
barrel
Dec. 30, 2010
Robinson Lake pipeline
inch
mi
Dec. 31, 2010
Other 2010 Acquisitions
entity
Dec. 31, 2010
White Cliffs Pipeline, LLC
Dec. 31, 2010
Capline And associated Tankage
Dec. 31, 2009
Capline And associated Tankage
Business acquisition                                              
Purchase price: Cash   $ 50,000,000                                          
Interest payable at closing (as a percent)   2.00%                                          
Contractual rights related to NGL pipelines acquired (in miles)     2,600                                        
NGL storage capacity acquired (in barrels)     20,000,000                                        
Number of fractionation plants acquired     7                                        
Aggregate net capacity of fractionation plants acquired (in barrels per day)     232,000                                        
Number of straddle plants acquired     4                                        
Number of field gas processing plants acquired     2                                        
Aggregate capacity of field gas processing plants acquired (in Bcf per day)     6                                        
Long-term and seasonal NGL inventories acquired (in barrels)     10,000,000                                        
Throughput capacity of straddle plant acquired (in Bcf per day)     2.5                                        
Number of rail cars under long-term leases acquired     720                                        
NGL supply (in barrels per day)       140,000 150,000                                    
Number of years sourcing services for gas supply will be provided after acquisition   2                                          
Number of transactions completed                           2                  
Number of additional acquisitions completed (in entities)                                 6     5      
Ownership interest (as a percent)               100.00%               100.00%         34.00% 11.00% 21.00%
Purchase price     1,670,000,000         765,000,000             220,000,000 349,000,000 20,000,000 229,000,000   178,000,000      
Purchase price net of cash and other working capital acquired               750,000,000                              
Purchase price allocation: Business and physical assets                                   170,000,000          
Purchase price allocation: Inventory and other working capital adjustments                                   59,000,000          
Gathering pipelines acquired (in miles)                             82 120     20        
Diameter of pipeline acquired (in inches)                             16       8        
Inventory (volumes in barrels)                                   460,000          
Number of truck terminals acquired                                   8          
GO Bonds obligor amount                     100,000,000 100,000,000                      
Percentage of remaining purchase price (as a percent)           5.00%                                  
Escrowed purchase price           37,000,000                                  
Adjustment amount received           10,000,000                                  
Capital expenditures related to acquisition             3,000,000                                
Purchase accounting adjustments 3,000,000                                            
Business acquisition, allocation of fair value of assets and liabilities                                              
Inventory             14,000,000           2,000,000                    
Property and equipment, net             341,000,000           282,000,000                    
Base Gas             3,000,000                                
Other working capital                         (7,000,000)                    
Other working capital (including cash acquired)             14,000,000                                
Cash acquired             13,000,000                                
Intangible assets             92,000,000           152,000,000                    
Enviornmental liability                         (9,000,000)                    
Goodwill             301,000,000           169,000,000     155,000,000   83,000,000          
Total assets and liabilities             765,000,000           589,000,000                    
Property and equipment, useful life                                              
Average Depreciable Life, (in years)                 5 70                          
Intangible assets, useful life                                              
Average Depreciable Life, (in years)                 2 10                          
Tax abatement included in amortizable intangible assets             15,000,000                                
Contracts value included in amortizable intangible assets             77,000,000                                
Estimated amortization expense related to finite-lived intangible assets for the next five years                                              
Future amortization expense remainder fiscal year             13,000,000                                
Future amortization expense first full fiscal year             14,000,000                                
Future amortization expense second full fiscal year             13,000,000                                
Future amortization expense third full fiscal year             11,000,000                                
Future amortization expense fourth full fiscal year             $ 8,000,000