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Investing Activities (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mar. 18, 2019
Dec. 15, 2018
Sep. 30, 2018
Schedule of Investments [Line Items]                    
Impairment of equity-method investments (Note 18)         $ (186) $ (32) $ 0      
Gain (loss) on deconsolidation of businesses         29 (203) 0      
Gain on disposition of equity-method investment         122 0 269      
Other investing income (loss) – net         (79) 187 282      
Equity-method investment, payments to purchase or contributions         453 1,132 132      
Equity-method investments $ 6,235       6,235 7,821        
Proceeds from dispositions of equity-method investments         485 0 200      
Equity-method investment, difference between carrying amount and underlying equity 1,000       1,000 1,800        
Distributions from unconsolidated affiliates         657 693 784      
Summarized Financial Position of Equity Method Investments                    
Current assets 581       581 834        
Noncurrent assets 11,966       11,966 13,199        
Current liabilities (341)       (341) (605)        
Noncurrent liabilities $ (2,532)       (2,532) (2,491)        
Summarized Results of Operations of Equity Method Investments                    
Gross revenue         2,490 2,411 1,961      
Operating income         685 804 871      
Net income         598 795 806      
Other Income [Member]                    
Schedule of Investments [Line Items]                    
Other investing income (loss) – net         14 16 13      
Appalachia Midstream Investments [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         $ 140 246 70      
Equity Method Investment, Ownership Percentage 66.00%       66.00%          
Equity-method investments [1] $ 3,236       $ 3,236 3,218        
Distributions from unconsolidated affiliates         293 297 270      
Rocky Mountain Midstream Holdings LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         $ 145 $ 795 0      
Equity Method Investment, Ownership Percentage 50.00%       50.00% 50.00%       40.00%
Equity-method investments $ 881       $ 881 $ 776        
Distributions from unconsolidated affiliates         38 0 0      
Discovery Producer Services LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         $ 0 5 1      
Equity Method Investment, Ownership Percentage 60.00%       60.00%          
Equity-method investments $ 472       $ 472 507        
Distributions from unconsolidated affiliates         41 45 127      
Caiman Energy II [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         $ 28 0 24      
Equity Method Investment, Ownership Percentage 58.00%       58.00%          
Equity-method investments $ 428       $ 428 412        
Distributions from unconsolidated affiliates         $ 42 46 49      
Overland Pass Pipeline Company LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage 50.00%       50.00%          
Equity-method investments $ 403       $ 403 415        
Distributions from unconsolidated affiliates         77 73 68      
Laurel Mountain Midstream, LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         $ 36 16 0      
Equity Method Investment, Ownership Percentage 69.00%       69.00%          
Equity-method investments $ 249       $ 249 314        
Distributions from unconsolidated affiliates         $ 30 23 32      
Gulfstream Natural Gas System, LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage 50.00%       50.00%          
Equity-method investments $ 217       $ 217 225        
Distributions from unconsolidated affiliates         86 93 92      
Brazos Permian II, LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         $ 18 $ 27 0      
Equity Method Investment, Ownership Percentage 15.00%       15.00% 15.00%        
Equity-method investments $ 194       $ 194 $ 191        
Utica East Ohio Midstream, LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage           62.00%        
Business Acquisition, Percentage of Voting Interests Acquired               38.00%    
Equity-method investments [2] 0       0 $ 1,293        
Distributions from unconsolidated affiliates         13 70 80      
Jackalope Gas Gathering Services LLC [Member]                    
Schedule of Investments [Line Items]                    
Gain on disposition of equity-method investment   $ 122                
Equity-method investment, payments to purchase or contributions         24 $ 42 0      
Equity Method Investment, Ownership Percentage   50.00% 50.00%     50.00%        
Goodwill, Period Increase (Decrease)           $ (47)        
Equity-method investments [3] 0       0 343        
Proceeds from dispositions of equity-method investments   $ 485                
Delaware Basin Gas Gathering System [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         0 0 32      
Distributions from unconsolidated affiliates         0 0 39      
Constitution Pipeline Company LLC [Member]                    
Schedule of Investments [Line Items]                    
Gain (loss) on deconsolidation of businesses 27                  
Other [Member]                    
Schedule of Investments [Line Items]                    
Equity-method investment, payments to purchase or contributions         62 1 5      
Equity-method investments $ 155       155 127        
Distributions from unconsolidated affiliates         37 46 27      
Total Equity Method Investment [Member]                    
Schedule of Investments [Line Items]                    
Distributions from unconsolidated affiliates         $ 657 693 784      
Northeast G And P [Member]                    
Schedule of Investments [Line Items]                    
Investments, Fair Value Disclosure       $ 1,100            
Northeast G And P [Member] | Appalachia Midstream Investments [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage 66.00%       66.00%          
Northeast G And P [Member] | Caiman Energy II [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage 58.00%       58.00%          
Northeast G And P [Member] | Laurel Mountain Midstream, LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage 69.00%       69.00%          
West [Member] | Rocky Mountain Midstream Holdings LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage 50.00%       50.00%          
West [Member] | Overland Pass Pipeline Company LLC [Member]                    
Schedule of Investments [Line Items]                    
Equity Method Investment, Ownership Percentage 50.00%       50.00%          
West [Member] | Brazos Permian II, LLC [Member]                    
Schedule of Investments [Line Items]                    
Gain (loss) on deconsolidation of businesses           (141)        
Equity Method Investment, Ownership Percentage 15.00%       15.00%          
West [Member] | Jackalope Gas Gathering Services LLC [Member]                    
Schedule of Investments [Line Items]                    
Gain (loss) on deconsolidation of businesses     $ (62)              
Goodwill, Period Increase (Decrease)     47     $ (47)        
West [Member] | Delaware Basin Gas Gathering System [Member]                    
Schedule of Investments [Line Items]                    
Gain on disposition of equity-method investment             269      
Equity Method Investment, Ownership Percentage       50.00%            
Proceeds from dispositions of equity-method investments       $ 155            
West [Member] | Ranch Westex JV LLC [Member]                    
Schedule of Investments [Line Items]                    
Proceeds from dispositions of equity-method investments             $ 45      
Brazos Permian II, LLC [Member] | West [Member]                    
Schedule of Investments [Line Items]                    
Investments, Fair Value Disclosure                 $ 192  
Jackalope Gas Gathering Services LLC [Member] | West [Member]                    
Schedule of Investments [Line Items]                    
Investments, Fair Value Disclosure     $ 310              
Measurement Input, Discount Rate [Member] | Appalachia Midstream Investments [Member] | Northeast G And P [Member]                    
Schedule of Investments [Line Items]                    
Property Plant And Equipment And Intangibles Fair Value Inputs       9.50%            
Measurement Input, Discount Rate [Member] | Jackalope Gas Gathering Services LLC [Member] | West [Member]                    
Schedule of Investments [Line Items]                    
Property Plant And Equipment And Intangibles Fair Value Inputs     10.90%              
[1]
Includes equity-method investments in multiple gathering systems in the Marcellus Shale with an approximate average 66 percent interest.
[2]
At December 31, 2018, we owned a 62 percent interest in UEOM. On March 18, 2019, we acquired the remaining 38 percent interest. As a result of acquiring this additional interest, we obtained control of and now consolidate UEOM.
[3]
At December 31, 2018, we owned a 50 percent interest in Jackalope. In April 2019, we sold our interest in Jackalope.