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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
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 20, 2012
USD ($)
Jul. 01, 2014
USD ($)
Equity Method Investments and Joint Ventures [Abstract]                    
Payments to Acquire Equity Method Investments           $ 177 $ 595 $ 482    
Business Combination, Consideration Transferred [Abstract]                    
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest                 2.00%  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain           0 0 2,544    
Business Acquisition, Pro Forma Information [Abstract]                    
Gain on remeasurement of equity-method investment (Note 2)           0 0 2,544    
Williams Partners [Member]                    
Business Acquisition [Line Items]                    
Goodwill, Purchase Accounting Adjustments             25      
Business Acquisition, Purchase Price Allocation [Abstract]                    
Goodwill           $ 47 47 1,120    
Access Midstream [Member]                    
Equity Method Investments and Joint Ventures [Abstract]                    
Payments to Acquire Equity Method Investments                 $ 2,190  
Business Combination, Consideration Transferred [Abstract]                    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value         $ 4,600          
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           $ 0 $ 357 57    
Utica East Ohio Midstream, LLC [Member] | Williams Partners [Member]                    
Equity Method Investments and Joint Ventures [Abstract]                    
Equity Method Investment, Ownership Percentage           62.00%        
Payments to Acquire Equity Method Investments $ 357                  
Reduction in incentive distribution rights payment $ 2                  
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)            
Business Combination, Consideration Transferred [Abstract]                    
Payments to Acquire Businesses, Gross         $ 5,995          
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain               2,544    
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               8,181    
Business Acquisition, Pro Forma Net Income (Loss)               622    
Gain on remeasurement of equity-method investment (Note 2)               2,544    
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 Combination, Consideration Transferred [Abstract]                    
Business Combination, Acquisition Related Costs               16    
Access Midstream Partners Acquisition [Member] | Interest Incurred [Member]                    
Business Combination, Consideration Transferred [Abstract]                    
Business Combination, Acquisition Related Costs               9    
Access Midstream Partners Acquisition [Member] | Income Loss From Equity Method Investment [Member]                    
Business Combination, Consideration Transferred [Abstract]                    
Business Combination, Integration Related Costs               $ 19    
Access Midstream Partners Acquisition [Member] | Pro Forma [Member]                    
Business Combination, Consideration Transferred [Abstract]                    
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life               30 years    
Access Midstream Partners Acquisition [Member] | Williams Partners [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)
Access Midstream Partners Acquisition [Member] | Access Midstream Partners L.P. [Member]                    
Business Combination, Consideration Transferred [Abstract]                    
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage                   26.00%
Access Midstream Partners Acquisition [Member] | Access Midstream Partners L.P. [Member] | Williams Partners [Member]                    
Business Acquisition, Purchase Price Allocation [Abstract]                    
Noncontrolling interest                   $ (6,544)
Access Midstream Partners Acquisition [Member] | ACMP's subsidiaries [Member] | Williams Partners [Member]                    
Business Acquisition, Purchase Price Allocation [Abstract]                    
Noncontrolling interest                   $ (958)
Eagle Ford Gathering System [Member]                    
Business Combination, Consideration Transferred [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                
Business Acquisition, Purchase Price Allocation [Abstract]                    
Other intangible assets   $ 32                
Eagle Ford Gathering System [Member] | Williams Partners [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                
Business Combination, Consideration Transferred [Abstract]                    
Payments to Acquire Businesses, Gross   $ 112                
Business Acquisition, Purchase Price Allocation [Abstract]                    
Property, plant, and equipment   $ 80                
Limited Partner [Member] | Access Midstream Partners L.P. [Member]                    
Equity Method Investments and Joint Ventures [Abstract]                    
Equity Method Investment, Ownership Percentage                 24.00%  
General Partner [Member] | Access Midstream [Member]                    
Equity Method Investments and Joint Ventures [Abstract]                    
Equity Method Investment, Ownership Percentage                 50.00%  
General Partner [Member] | Access Midstream Partners Acquisition [Member]                    
Business Combination, Consideration Transferred [Abstract]                    
Business Acquisition, Percentage of Voting Interests Acquired                   50.00%
Additional Investment [Member] | Utica East Ohio Midstream, LLC [Member]                    
Equity Method Investments and Joint Ventures [Abstract]                    
Equity Method Investment, Ownership Percentage 13.00%