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Assets Held for Sale or Sold (Details) - Operating Segments [Member] - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Jul. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 01, 2018
Lower 48 Segment | 2018 Q3 Undeveloped Acreage Exchanged |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Gain (Loss) on Sale of Oil and Gas Property |  |  | $ 56 |  |  |  |  |  |
Barnett [Member] | Lower 48 Segment |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Net carrying value |  |  | 201 |  |  |  | $ 201 |  |
Impairment of AHFS |  |  | 43 |  | $ 44 |  |  | $ 568 |
Fair Value - Net PP&E (held for sale) |  |  |  |  | 250 |  |  |  |
Amount of PP&E in carrying value of assets |  |  | 250 |  |  |  | 250 |  |
Pretax operating Income (Loss) on AHFS |  |  |  |  |  |  | (59) | (575) |
Barnett [Member] | Lower 48 Segment | Scenario Plan [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  | 230 |  |  |  |  |  |
Barnett [Member] | Lower 48 Segment | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Liabilities of AHFS |  |  | 49 |  |  |  | $ 49 |  |
2018 Q1 Certain properties sold. | Lower 48 Segment |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  | 112 |  |  |  |
Gain (Loss) on Sale of Oil and Gas Property |  |  |  |  | $ 0 |  |  |  |
2018 Q2 undeveloped acreage sold [Member] | Lower 48 Segment |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  | $ 105 |  |  |  |  |
Gain (Loss) on Sale of Oil and Gas Property |  |  |  | 0 |  |  |  |  |
Foster Creek Christina Lake (FCCL) and western Canada gas properties [Member] | Canada |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Cenovus Contingent Payment Trigger |  |  |  |  |  |  | The contingent payment, calculated on a quarterly basis, is $6 million Canadian dollars (CAD) for every $1 CAD by which the Western Canada Select quarterly average crude price exceeds $52 CAD per barrel. |  |
Gain (Loss) on Sale of Oil and Gas Property |  |  | 45 | $ 50 |  |  |  |  |
Clair Field [Member] | Europe and North Africa Segment [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Net carrying value |  |  | 945 |  |  |  | $ 945 |  |
Amount of PP&E in carrying value of assets |  |  | 1,552 |  |  |  | 1,552 |  |
Amount of deferred taxes in carrying value of asset |  |  | 544 |  |  |  | 544 |  |
Pretax operating Income (Loss) on AHFS |  |  |  |  |  |  | 13 | $ 1 |
Clair Field [Member] | Europe and North Africa Segment [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Percent Sold |  | 16.50% |  |  |  |  |  |  |
Percent Retained |  | 7.50% |  |  |  |  |  |  |
Clair Field [Member] | Europe and North Africa Segment [Member] | Minimum [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Non Cash Gain (Loss) On Sale |  | $ 500 |  |  |  |  |  |  |
Clair Field [Member] | Europe and North Africa Segment [Member] | Maximum [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Non Cash Gain (Loss) On Sale |  | $ 1,000 |  |  |  |  |  |  |
Clair Field [Member] | Europe and North Africa Segment [Member] | Asset Retirement Obligation Costs [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Liabilities of AHFS |  |  | $ 63 |  |  |  | $ 63 |  |
San Juan Basin [Member] | Lower 48 Segment |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
San Juan Contingent Trigger |  |  | The transaction includes a contingent payment of up to $300 million. |  |  |  |  |  |
Proceeds from asset dispositions |  |  |  |  |  | $ 2,500 |  |  |
Gain (Loss) on Sale of Oil and Gas Property |  |  |  |  |  | $ (22) |  |  |
Greater Sunrise Fields [Member] | Asia Pacific and Middle East Segment [Member] | Scenario Plan [Member] |  |  |  |  |  |  |  |  |
Long Lived Assets Held For Sale [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from asset dispositions | $ 350 |  |  |  |  |  |  |  |
Investment Owned, Percent of Net Assets |  |  |  |  |  |  |  |  | 30.00%

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