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Investing Activities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 20, 2012
Schedule of Investments [Line Items]        
Impairment of equity-method investments $ 430 $ 1,359 $ 0  
Equity earnings (losses) 397 335 144  
Investment income, nonoperating 63 27 43  
Equity-method investments 6,701 7,336    
Equity-method investment, difference between carrying amount and underlying equity 1,900 2,400    
Equity-method investment, payments to purchase or contributions 177 595 482  
Equity-method investment, dividends or distributions 742 633 440  
Special distribution from equity-method investment 0 396 0  
Summarized Financial Position of Equity Method Investments        
Current assets 508 773    
Noncurrent assets 9,695 9,549    
Current liabilities (412) (633)    
Noncurrent liabilities (1,484) (1,450)    
Summarized Results of Operations of Equity Method Investments        
Gross revenue 1,883 1,707 1,623  
Operating income 799 690 534  
Net income 726 611 460  
Caiman Energy II [Member]        
Schedule of Investments [Line Items]        
Equity-method investments $ 426 418    
Equity-method investment, ownership percentage 58.00%      
Equity-method investment, payments to purchase or contributions $ 22 0 175  
Equity-method investment, dividends or distributions 40 33 13  
Delaware Basin Gas Gathering System [Member]        
Schedule of Investments [Line Items]        
Impairment of equity-method investments 59 503    
Equity-method investments $ 988 977    
Equity-method investment, ownership percentage 50.00%      
Equity-method investment, payments to purchase or contributions $ 105 57 20  
Equity-method investment, dividends or distributions 39 33 0  
Appalachia Midstream Investments [Member]        
Schedule of Investments [Line Items]        
Impairment of equity-method investments 294 562    
Equity earnings (losses) (19)      
Gain on sale of equity-method investment 27      
Equity-method investments [1] $ 2,062 2,464    
Equity-method investment, ownership percentage 41.00%      
Equity-method investment, payments to purchase or contributions $ 28 93 84  
Equity-method investment, dividends or distributions 211 219 130  
Utica East Ohio Midstream, LLC [Member]        
Schedule of Investments [Line Items]        
Impairment of equity-method investments 0 241    
Equity-method investments $ 1,448 1,525    
Equity-method investment, ownership percentage 62.00%      
Equity-method investment, payments to purchase or contributions $ 0 357 57  
Equity-method investment, dividends or distributions 92 42 0  
Discovery Producer Services LLC [Member]        
Schedule of Investments [Line Items]        
Equity-method investments $ 572 602    
Equity-method investment, ownership percentage 60.00%      
Equity-method investment, payments to purchase or contributions $ 0 35 106  
Equity-method investment, dividends or distributions 141 116 36  
Laurel Mountain Midstream, LLC [Member]        
Schedule of Investments [Line Items]        
Impairment of equity-method investments 50 45    
Equity-method investments $ 324 391    
Equity-method investment, ownership percentage 69.00%      
Equity-method investment, dividends or distributions $ 28 31 39  
Overland Pass Pipeline Company LLC [Member]        
Schedule of Investments [Line Items]        
Equity-method investments $ 430 445    
Equity-method investment, ownership percentage 50.00%      
Equity-method investment, dividends or distributions $ 69 45 27  
Gulfstream Natural Gas System, L.L.C.[Member]        
Schedule of Investments [Line Items]        
Equity-method investments $ 261 293    
Equity-method investment, ownership percentage 50.00%      
Equity-method investment, dividends or distributions $ 100 88 81  
Special distribution from equity-method investment   396    
Contribution to equity-method investment for repayment of debt 148 248    
Access Midstream Partners [Member]        
Schedule of Investments [Line Items]        
Equity earnings (losses)     (7)  
Equity-method investment, payments to purchase or contributions       $ 2,190
Equity-method investment, dividends or distributions 0 0 64  
Access Midstream Partners [Member] | Adjustment for amortization of difference between carrying amount and underlying equity [Member]        
Schedule of Investments [Line Items]        
Equity earnings (losses)     (30)  
Ranch Westex JV LLC [Member]        
Schedule of Investments [Line Items]        
Impairment of equity-method investments 24 0    
Other [Member]        
Schedule of Investments [Line Items]        
Impairment of equity-method investments 3 8    
Equity-method investments 190 221    
Equity-method investment, payments to purchase or contributions 22 53 40  
Equity-method investment, dividends or distributions 22 26 50  
Bluegrass Pipeline [Member]        
Schedule of Investments [Line Items]        
Equity earnings (losses)     (67)  
Moss Lake [Member]        
Schedule of Investments [Line Items]        
Equity earnings (losses)     (4)  
Former Venezuela Operations [Member]        
Schedule of Investments [Line Items]        
Investment income, nonoperating 36 27 41  
Equity-Method Investment Debt Due November 1, 2015 [Member] | Gulfstream Natural Gas System, L.L.C.[Member]        
Schedule of Investments [Line Items]        
Equity-method investment debt   $ 500    
Equity-Method Investment Debt Due June 1, 2016 [Member] | Gulfstream Natural Gas System, L.L.C.[Member]        
Schedule of Investments [Line Items]        
Equity-method investment debt $ 300      
Access Midstream Partners Acquisition [Member] | Income Loss From Equity-Method Investment [Member]        
Schedule of Investments [Line Items]        
Business Combination, Integration Related Costs     $ 19  
[1] Includes equity-method investments in multiple gathering systems in the Marcellus Shale with an approximate average 41 percent interest.