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Equity Method Investments - Narrative (Details) - USD ($)
shares in Millions, $ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2018
Apr. 30, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Nov. 30, 2019
Sep. 30, 2019
Mar. 31, 2019
Feb. 28, 2019
Equity Method Investments and Joint Ventures [Abstract]                  
Retained earnings related to undistributed earnings of equity method investees     $ 73            
Schedule of Equity Method Investments [Line Items]                  
Capital contributions     189            
Proceeds from divestitures     173 $ 1,999 $ 2,073        
Gain on sale     $ 0 $ 843 $ 326        
EMED Pipeline B.V.                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments             25.00%    
EMG                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments     10.00%            
EPIC Crude Holdings, LP                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments     30.00%            
Delaware Crossing LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments     50.00%            
CONE Gathering LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments 34.10%                
Eastern Mediterranean Pipeline B.V.                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments     25.00%            
Advantage Joint Venture                  
Schedule of Equity Method Investments [Line Items]                  
Payments to acquire interest in joint venture   $ 67              
EPIC Y-Grade, LP                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments     15.00%            
Eastern Mediterranean Pipeline B.V. | EMG                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments     39.00%            
Noble Midstream | EPIC Crude Holdings, LP                  
Schedule of Equity Method Investments [Line Items]                  
Capital contributions     $ 351            
Ownership interest acquired, step acquisition               30.00%  
Noble Midstream | Delaware Crossing LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments                 50.00%
Capital contributions     70            
Noble Midstream | EPIC Y-Grade, LP                  
Schedule of Equity Method Investments [Line Items]                  
Capital contributions     $ 169            
Ownership interest acquired, step acquisition               15.00%  
Salt Creek Midstream LLC | Delaware Crossing LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership interest in equity method investments                 50.00%
CONE Gathering LLC                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage 50.00%                
Proceeds from divestitures $ 309                
Gain on sale $ 196                
Common units owned (shares) 21.7                
Net proceeds $ 387                
Realized gain on sale $ 307                
Noble Midstream Partners LP                  
Schedule of Equity Method Investments [Line Items]                  
Common units owned (shares)           56.5      
Advantage Pipeline | Noble Midstream Partners LP                  
Schedule of Equity Method Investments [Line Items]                  
Ownership percentage   50.00%