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Acquisition (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 01, 2016
Mar. 31, 2017
Dec. 31, 2016
Business Acquisition [Line Items]      
Goodwill   $ 2,292 $ 2,286
Midstream Natural Gas Assets      
Business Acquisition [Line Items]      
Cash paid for gathering assets $ 1,200    
Assumed debt 204    
Assumed debt, acquiree portion $ 112    
Noncontrolling interest percentage 45.00%    
Assumed debt, noncontrolling interest portion $ 92    
Escrow deposit 130    
Goodwill 268    
Goodwill purchase accounting adjustments   $ 6  
Customer relationship intangibles $ 770    
Useful life of acquired intangible assets 40 years    
Pre-acquisition contingencies $ 39    
Direct transaction costs     15
Operating revenues associated with acquired entities     39
Net income (loss) associated with acquired entities     4
Midstream Natural Gas Assets | West Virginia      
Business Acquisition [Line Items]      
Percent of assets acquired 55.00% 55.00%  
M3 Midstream | Midstream Natural Gas Assets | Pennsylvania and West Virginia      
Business Acquisition [Line Items]      
Percent of assets acquired 100.00%    
M3 Midstream | Midstream Natural Gas Assets | West Virginia      
Business Acquisition [Line Items]      
Percent of assets acquired 40.00%    
Vega Energy Partners | Midstream Natural Gas Assets | West Virginia      
Business Acquisition [Line Items]      
Percent of assets acquired 15.00%    
Customer relationships | Midstream Natural Gas Assets      
Business Acquisition [Line Items]      
Useful life of acquired intangible assets 10 years    
Transaction costs | Midstream Natural Gas Assets      
Business Acquisition [Line Items]      
Net income (loss) associated with acquired entities     $ (15)