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Acquisitions (Details) (USD $)
In Millions, except Share data, unless otherwise specified
6 Months Ended 2 Months Ended 4 Months Ended 6 Months Ended
Jun. 30, 2012
Feb. 17, 2012
Laser [Member]
Williams Partners [Member]
Miles
Inches
Apr. 27, 2012
Caiman [Member]
Williams Partners [Member]
Jun. 30, 2012
Caiman [Member]
Williams Partners [Member]
Business Acquisition, Entity Acquired and Reason for Acquisition [Abstract]        
Business Acquisition, Percentage of Voting Interests Acquired   100.00% 100.00%  
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]        
Business Acquisition, Cost of Acquired Entity, Cash Paid   $ 325 $ 1,720  
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares   7,531,381 11,779,296  
Business Acquisition, Cost of Acquired Entity, Equity Interests Issued and Issuable   441 603  
Number Of Miles Of Pipeline Acquired In Pennsylvania   33    
Diameter In Inches Of Pipeline Acquired In Pennsylvania   16    
Number of miles of pipeline acquired in New York   10    
Business Combination, Acquisition Related Costs       16
Business Acquisition, Purchase Price Allocation [Abstract]        
Assets held for sale   18 0  
Other current assets   3 13  
Property, plant and equipment   158 665  
Intangible assets   318 1,313  
Current liabilities   (21) (98)  
Identifiable net assets acquired   476 1,893  
Goodwill   290 434  
Total   766 2,327  
Finite-Lived Intangible Assets [Abstract]        
Acquired Finite-lived Intangible Asset, Weighted Average Useful Life (years) 30      
Business Acquisition, Purchase Price Allocation, Goodwill [Abstract]        
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount   $ 290 $ 434