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Acquisitions (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 18, 2019
Mar. 17, 2019
Jun. 30, 2019
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Business Acquisition [Line Items]                    
Equity Method Investment, Other than Temporary Impairment       $ 0   $ 114 $ 938 $ 186    
Changes in ownership of consolidated subsidiaries, net           1   142    
Impairment of goodwill (Note 12)       $ 0   0 187 0    
Noncontrolling Interests                    
Business Acquisition [Line Items]                    
Changes in ownership of consolidated subsidiaries, net           2   568    
Impairment of goodwill (Note 12)         $ 65          
Capital in excess of par value [Member]                    
Business Acquisition [Line Items]                    
Changes in ownership of consolidated subsidiaries, net           $ (1)   (426)    
Northeast JV [Member]                    
Business Acquisition [Line Items]                    
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners     35.00%              
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest     65.00%              
Northeast JV [Member]                    
Business Acquisition [Line Items]                    
Noncontrolling Interest in Joint Ventures     $ 1,330              
Increase (Decrease) in Deferred Income Taxes                 $ (141)  
Northeast JV [Member] | Noncontrolling Interests                    
Business Acquisition [Line Items]                    
Changes in ownership of consolidated subsidiaries, net                 567  
Northeast JV [Member] | Capital in excess of par value [Member]                    
Business Acquisition [Line Items]                    
Changes in ownership of consolidated subsidiaries, net                 $ (426)  
Impairment Of Equity-Method Investments [Member]                    
Business Acquisition [Line Items]                    
Equity Method Investment, Other than Temporary Impairment             $ 938 $ 186    
Utica East Ohio Midstream, LLC Acquisition [Member]                    
Business Acquisition [Line Items]                    
Payments to Acquire Businesses, Gross $ 741                  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 13                  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain (Loss), Net 0                  
Goodwill $ 187                  
Goodwill, Other Increase (Decrease)         $ (1)          
Utica East Ohio Midstream, LLC [Member]                    
Business Acquisition [Line Items]                    
Equity Method Investment, Ownership Percentage                   62.00%
Utica East Ohio Midstream, LLC [Member] | Fair Value, Nonrecurring [Member] | Level 2 [Member] | Northeast G And P [Member] | Impairment Of Equity-Method Investments [Member]                    
Business Acquisition [Line Items]                    
Equity Method Investment, Other than Temporary Impairment [1]   $ 74                
Utica East Ohio Midstream, LLC [Member] | Utica East Ohio Midstream, LLC Acquisition [Member]                    
Business Acquisition [Line Items]                    
Business Acquisition, Percentage of Voting Interests Acquired 38.00%                  
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage   62.00%                
[1] The estimated fair value was determined by a market approach based on the transaction price for the purchase of the remaining interest in UEOM as finalized just prior to the signing and closing of the acquisition in March 2019 (see Note 2 – Acquisitions). These inputs resulted in a fair value measurement within Level 2 of the fair value hierarchy.