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Acquisitions (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended
Mar. 31, 2012
Apr. 30, 2012
BP NGL Acquisition
Y
Oct. 31, 2011
BP NGL Acquisition
Apr. 02, 2012
BP NGL Acquisition
bcfperday
barrel
barrelperday
plant
mi
railcar
Mar. 31, 2012
BP NGL Acquisition
Mar. 31, 2012
Other Acquisitions
entity
Business acquisition            
Purchase price       $ 1,670   $ 21
Purchase price: Cash deposit     50      
Interest paid at closing (as a percent)       2.00%    
Restricted cash (Note 4) 1,632       1,630  
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)       8,000,000    
Throughput capacity of straddle plant acquired (in Bcf per day)       2.5    
Number of rail cars under long-term leases acquired       720    
Number of years sourcing services for gas supply will be provided after acquisition   2        
Number of additional acquisitions completed (in entities)           2
Goodwill           $ 10