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Aquisitons (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2018 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 18, 2018
Business Combinations [Abstract] |  |  |  |  |  |
Property, Plant and Equipment, Net |  | $ 45,698,000,000 | $ 42,269,000,000 | $ 45,698,000,000 |  |
Capitalized Costs, Unproved Properties |  | 4,662,000,000 | 3,980,000,000 | 4,662,000,000 |  |
Capitalized Costs Proved Properties |  | 100,657,000,000 | 88,284,000,000 | 100,657,000,000 |  |
Inventories Acquired |  |  | 0 | 42,000,000 | $ 0 |
Investments and long-term receivables |  | 9,329,000,000 | 8,687,000,000 | 9,329,000,000 |  |
Asset Retirement Obligation |  | 7,908,000,000 | $ 6,206,000,000 | $ 7,908,000,000 | $ 7,798,000,000 |
Kuparuk Assets [Member] | Alaska Segment [Member] | Operating Segments [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Costs Incurred, Acquisition of Oil and Gas Properties, Total | $ 386,000,000 | 1,490,000,000 |  |  |  |
Percent Acquired | 22.00% |  |  |  |  |
Fair Value of Assets Acquired |  | 1,743,000,000 |  |  |  |
Business Combinations [Abstract] |  |  |  |  |  |
Capitalized Costs, Unproved Properties | $ 114,000,000 |  |  |  |  |
Capitalized Costs Proved Properties | 297,000,000 |  |  |  |  | $ 1,900,000,000
Inventories Acquired | 20,000,000 | $ 42,000,000 |  |  |  |
Investments and long-term receivables | 14,000,000 |  |  |  |  | 15,000,000
Net Working Capital |  |  |  |  |  | (100,000,000)
Kuparuk Assets [Member] | Alaska Segment [Member] | Operating Segments [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |
Business Combinations [Abstract] |  |  |  |  |  |
Asset Retirement Obligation | $ 59,000,000 |  |  |  |  | $ 374,000,000

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- Definition Capitalized costs of proved properties incurred for any combination mineral interests acquisitions; wells and related equipment; support equipment and facilities; and uncompleted wells and equipment and other costs not previously disclosed within this table. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 360 -URI http://asc.fasb.org/subtopic&trid=2145654 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 235 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e61901-109447 + Details
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