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Acquisitions (Details)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
May 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Jul. 02, 2014
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jul. 01, 2014
USD ($)
Business Acquisition [Line Items]                  
Goodwill, Purchase Accounting Adjustments             $ 25    
Business Acquisition, Purchase Price Allocation [Abstract]                  
Goodwill           $ 47 47 $ 1,120  
Equity Method Investments and Joint Ventures [Abstract]                  
Payments to Acquire Equity Method Investments           177 594 468  
Central [Member]                  
Business Acquisition [Line Items]                  
Goodwill, Purchase Accounting Adjustments             10    
Business Acquisition, Purchase Price Allocation [Abstract]                  
Goodwill           $ 0 0 240  
Access Midstream Partners Acquisition [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment       $ 150          
Goodwill, Purchase Accounting Adjustments       25          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles       (168)          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Investments       $ (7)          
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life         30 years        
Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement                 56.00%
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension         17 years        
Business Acquisition, Pro Forma Information [Abstract]                  
Business Acquisition, Pro Forma Revenue               7,953  
Business Acquisition, Pro Forma Net Income (Loss)               1,376  
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual               781  
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual               165  
Access Midstream Partners Acquisition [Member] | Selling, General and Administrative Expenses [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Acquisition Related Costs               16  
Access Midstream Partners Acquisition [Member] | Interest Expense [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Acquisition Related Costs               $ 9  
Access Midstream Partners Acquisition [Member] | Pro Forma [Member]                  
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life               30 years  
Access Midstream Partners Acquisition [Member] | Central [Member]                  
Business Acquisition, Purchase Price Allocation [Abstract]                  
Accounts receivable                 $ 168
Other current assets                 63
Investments                 5,865
Property, plant, and equipment                 7,165
Goodwill                 499
Other intangible assets                 8,841
Current liabilities                 (408)
Debt                 (4,052)
Other noncurrent liabilities                 (9)
Equity                 (10,630)
Access Midstream Partners Acquisition [Member] | ACMP's subsidiaries [Member] | Central [Member]                  
Business Acquisition, Purchase Price Allocation [Abstract]                  
Noncontrolling interest                 (958)
Access Midstream Partners Acquisition [Member] | Access Midstream Partners Lp [Member] | Central [Member]                  
Business Acquisition, Purchase Price Allocation [Abstract]                  
Noncontrolling interest                 $ (6,544)
Eagle Ford Gathering System [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment     $ 20            
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles     $ (20)            
Number Of Miles Of Pipeline Acquired   140              
Payments to Acquire Businesses, Gross   $ 112              
Business Acquisition, Purchase Price Allocation [Abstract]                  
Property, plant, and equipment   80              
Other intangible assets   $ 32              
Intangible Assets, Net (Excluding Goodwill) [Abstract]                  
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   30 years              
Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension   10 years              
Utica East Ohio Midstream, LLC [Member]                  
Equity Method Investments and Joint Ventures [Abstract]                  
Equity Method Investment, Ownership Percentage           62.00%      
Payments to Acquire Equity Method Investments $ 357         $ 0 $ 357 $ 57  
Reduction in incentive distribution rights payment $ 2                
Utica East Ohio Midstream, LLC [Member] | Additional Investment [Member]                  
Equity Method Investments and Joint Ventures [Abstract]                  
Equity Method Investment, Ownership Percentage 13.00%