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Asset Acquisitions and Dispositions - Asset Acquisition - Textual (Details) $ in Millions | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2020 USD ($) a | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Asset Acquisition |  |  |
Asset retirement obligations and accrued environmental costs |  | $ 5,651 | $ 5,352
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt |  | $ 3,900 |
Canada Segment [Member] | Operating Segments [Member] | Montney [Member] |  |  |
Asset Acquisition |  |  |
Oil and Gas, Undeveloped Acreage, Net | a | 295,000 |  |
Noncontrolling Interest, Ownership Percentage by Parent | 100.00% |  |
Additional Montney acreage [Member] | Canada Segment [Member] | Operating Segments [Member] |  |  |
Asset Acquisition |  |  |
Payments to Acquire Businesses, Gross | $ 382 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities | $ 31 |  |
Oil and Gas, Undeveloped Acreage, Net | a | 140,000 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 490 |  |
Asset retirement obligations and accrued environmental costs | 77 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $ 31 |  |

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- Definition Non current portion of the carrying amount of a liability for an asset retirement obligation, as well as the carrying value of an obligation (known or estimated) arising from requirements to perform activities to remediate one of more sites, payable after twelve months or beyond the next operating cycle if longer. + References No definition available. + Details
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- Definition Leased area representing summation of fractional ownership working interest to whole on which oil and gas wells have not been drilled or completed that would permit production of economic quantities of oil and gas. Excludes area of undrilled acreage held by production under terms of lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Regulation S-K (SK) -Number 229 -Section 1208 -Paragraph (b) + Details
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- Definition The amount of financial liabilities assumed (as defined) which have been recognized as of the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=121600890&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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