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The Merger - Narrative (Details) - USD ($)
2 Months Ended 9 Months Ended
Aug. 08, 2019
Sep. 30, 2019
Sep. 30, 2019
Aug. 07, 2019
Jun. 04, 2019
Jun. 03, 2019
Revolving Credit Facility            
Business Acquisition [Line Items]            
Revolving credit facility, maximum borrowing capacity       $ 3,000,000,000.0    
Anadarko            
Business Acquisition [Line Items]            
Cash of acquirer in exchange for acquiree (usd per share) $ 59.00          
Exchange ratio 0.2934          
Closing price per share, common stock (usd per share) $ 46.31          
Debt issuance, face amount $ 21,800,000,000          
Amount from exercise of warrants 10,000,000,000          
Long-term debt 12,829,000,000          
Goodwill 6,074,000,000          
Property, plant and equipment, net 48,771,000,000          
Other intangible assets acquired 2,400,000,000          
Aggregate amortization expense for intangible assets 108,000,000          
Revenues from date of merger   $ 1,500,000,000        
Net loss attributable to common shareholders from date of merger   $ 400,000,000        
Anadarko | Customer Contracts            
Business Acquisition [Line Items]            
Other intangible assets acquired $ 2,400,000,000          
Amortization period 25 years          
Anadarko | Level 2            
Business Acquisition [Line Items]            
Long-term debt $ 6,100,000,000          
Anadarko | Revolving Credit Facility            
Business Acquisition [Line Items]            
Revolving credit facility, maximum borrowing capacity         $ 5,000,000,000.0 $ 3,000,000,000.0
Revolving credit facility, additional commitment 2,000,000,000.0          
Anadarko | Senior Notes            
Business Acquisition [Line Items]            
Debt issuance, face amount 13,000,000,000.0          
Anadarko | The Term Loans            
Business Acquisition [Line Items]            
Debt issuance, face amount $ 8,800,000,000          
Series A Preferred Stock | Anadarko            
Business Acquisition [Line Items]            
Shares issued 100,000          
Common Stock | Anadarko            
Business Acquisition [Line Items]            
Closing price per share, common stock (usd per share) $ 46.31          
Shares issued 144,000,000          
Number of securities called by warrant (in shares) 80,000,000          
Exercise price of warrant (usd per share) $ 62.50          
Proved Properties | Anadarko            
Business Acquisition [Line Items]            
Property, plant and equipment, net $ 18,200,000,000          
Unproved Properties | Anadarko            
Business Acquisition [Line Items]            
Property, plant and equipment, net 26,000,000,000.0          
Land, Mineral Interests and Corporate Properties | Anadarko            
Business Acquisition [Line Items]            
Property, plant and equipment, net $ 5,000,000,000.0          
Restricted Stock Awards | Anadarko            
Business Acquisition [Line Items]            
Restricted stock issued on date of Merger (in shares) 1,700,000          
Weighted-average grant-date fair value (usd per share) $ 47.13          
Weighted-average grant-date fair value, remaining life 1 year 3 months 18 days          
Restricted Stock Awards | Anadarko | Minimum            
Business Acquisition [Line Items]            
Restricted shares vesting period     1 month      
Restricted Stock Awards | Anadarko | Maximum            
Business Acquisition [Line Items]            
Restricted shares vesting period     3 years 6 months