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Anadarko Acquisition and Other - Narrative (Details) $ / shares in Units, ft² in Thousands |  |  |  |  | 5 Months Ended | 6 Months Ended |  |  |
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Jun. 03, 2019 USD ($) | May 09, 2019 USD ($) | May 03, 2019 USD ($) | Apr. 30, 2019 USD ($) $ / shares shares | Dec. 31, 2019 USD ($) ft² | Dec. 31, 2019 $ / shares shares | Jun. 30, 2019 USD ($) | Jun. 04, 2019 USD ($) | May 10, 2019 USD ($)
Forecast | Ecopetrol | Subsequent Event |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Area of development | ft² |  |  |  |  | 97 |  |  |  |
Payments to acquire joint venture interest |  |  |  |  | $ 750,000,000 |  |  |  |
Carried capital exchanged for interest in new venture |  |  |  |  | $ 750,000,000 |  |  |  |
Interest in new venture, minority (percent) |  |  |  |  | 49.00% | 49.00% |  |  |
Interest in new venture, majority (percent) |  |  |  |  | 51.00% | 51.00% |  |  |
Share of capital expenditures (percent) |  |  |  |  | 75.00% |  |  |  |
Anadarko |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash received from sale of assets, liabilities, businesses and operations of Anadarko |  |  | $ 8,800,000,000 |  |  |  |  |  |
Fees related to merger related transaction costs and debt financing fees |  |  |  |  |  |  | $ 107,000,000 |  |
Anadarko | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Revolving credit facility | $ 3,000,000,000.0 |  |  |  |  |  |  | $ 5,000,000,000.0 |
Revolving credit facility, additional commitment | 2,000,000,000.0 |  |  |  |  |  |  |  |
Anadarko | The Bridge Facility | Bridge Loan |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loan facility term |  | 364 days |  |  |  |  |  |  |
Principal amount |  | $ 21,800,000,000 |  |  |  |  |  |  | $ 13,000,000,000.0
Anadarko | Term Loan Credit Agreement |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Reduction of principal |  |  |  |  |  |  | $ 8,800,000,000 |  |
Anadarko | Term Loan Credit Agreement | Citibank, N.A. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | $ 8,800,000,000 |  |  |  |  |  |  |  |
Anadarko | 364-Day Senior Unsecured Term Loan Facility | Citibank, N.A. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loan facility term | 364 days |  |  |  |  |  |  |  |
Principal amount | $ 4,400,000,000 |  |  |  |  |  |  |  |
Anadarko | Two-Year Senior Unsecured Term Loan Facility |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Loan facility term |  | 2 years |  |  |  |  |  |  |
Anadarko | Two-Year Senior Unsecured Term Loan Facility | Citibank, N.A. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Principal amount | $ 4,400,000,000 |  |  |  |  |  |  |  |
Anadarko | Berkshire Hathaway |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 10,000,000,000 |  |  |  |  |
Series A preferred stock agreed to purchase (in shares) | shares |  |  |  | 100,000 |  |  |  |  |
Securities Purchase Agreement, Preferred Stock, Face Value | $ / shares |  |  |  | $ 100,000 |  |  |  |  |
Warrant to purchase common stock (in shares) | shares |  |  |  | 80,000,000.0 |  |  |  |  |
Exercise price of common stock (usd per share) | $ / shares |  |  |  | $ 62.50 |  |  |  |  |
Face value dividend accrual (percent) |  |  |  | 8.00% |  |  |  |  |
Unpaid amount dividend accrual (percent) |  |  |  | 9.00% |  |  |  |  |
Anadarko | Forecast |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Cash of acquirer in exchange for acquiree (usd per share) | $ / shares |  |  |  |  |  | $ 59.00 |  |  |
Exchange ratio | shares |  |  |  |  |  | 0.2934 |  |  |

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