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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, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Jul. 01, 2014
USD ($)
Business Acquisition, Purchase Price Allocation [Abstract]                  
Goodwill           $ 47 $ 1,120    
Equity Method Investments and Joint Ventures [Abstract]                  
Payments to Acquire Equity Method Investments           594 468 $ 439  
Access Midstream [Member]                  
Business Acquisition, Purchase Price Allocation [Abstract]                  
Goodwill           $ 0 429    
Access Midstream Partners Acquisition [Member]                  
Business Acquisition [Line Items]                  
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment       $ 150          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill       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 7,881  
Business Acquisition, Pro Forma Net Income (Loss)             1,376 1,172  
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] | Access Midstream [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] | Access Midstream [Member]                  
Business Acquisition, Purchase Price Allocation [Abstract]                  
Noncontrolling interest                 (958)
Access Midstream Partners Acquisition [Member] | Access Midstream Partners Lp [Member] | Access Midstream [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         $ 357 [1] $ 57 [1] $ 0 [1]  
Reduction in incentive distribution rights payment $ 2                
Utica East Ohio Midstream, LLC [Member] | Access Midstream [Member]                  
Equity Method Investments and Joint Ventures [Abstract]                  
Equity Method Investment, Ownership Percentage           62.00%      
Utica East Ohio Midstream, LLC [Member] | Additional Investment [Member]                  
Equity Method Investments and Joint Ventures [Abstract]                  
Equity Method Investment, Ownership Percentage 13.00%         13.00%      
[1] 2015 includes purchase of additional interest in UEOM. (See Note 2 – Acquisitions.)