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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 |  |  |

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