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Other Financial Information (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Production and Operating Expenses |  | $ 5,322,000,000 | $ 5,213,000,000 | $ 5,162,000,000
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 58,000,000 | (13,000,000) | 31,000,000
Incurred |  |  |  |
Debt |  | 799,000,000 | 838,000,000 | 1,114,000,000
Other |  | 36,000,000 | 67,000,000 | 103,000,000
Interest Costs Incurred, Total |  | 835,000,000 | 905,000,000 | 1,217,000,000
Capitalized |  | (57,000,000) | (170,000,000) | (119,000,000)
Expensed |  | 778,000,000 | 735,000,000 | 1,098,000,000
Other Income |  |  |  |
Interest income |  | 166,000,000 | 97,000,000 | 112,000,000
Unrealized Gain (Loss) on Securities, before tax | [1] | 649,000,000 | (437,000,000) | 0
Other, net |  | 543,000,000 | 513,000,000 | 417,000,000
Other Nonoperating Income |  | 1,358,000,000 | 173,000,000 | 529,000,000
Research and Development Expenditures - expensed |  | 82,000,000 | 78,000,000 | 100,000,000
Shipping and Handling [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Production and Operating Expenses |  | 1,008,000,000 | 1,075,000,000 | 1,050,000,000
Corporate, Non-Segment [Member] |  |  |  |
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 21,000,000 | 21,000,000 | (3,000,000)
Incurred |  |  |  |
Expensed |  | 778,000,000 | 735,000,000 | 1,098,000,000
Other Income |  |  |  |
Interest income |  | 149,000,000 | 80,000,000 | 101,000,000
Alaska Segment [Member] | Operating Segments [Member] |  |  |  |
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 0 | 0 | 0
Other Income |  |  |  |
Interest income |  | 0 | 0 | 0
Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 0 | 0 | 0
Other Income |  |  |  |
Interest income |  | 0 | 0 | 0
Canada Segment [Member] | Operating Segments [Member] |  |  |  |
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 5,000,000 | (11,000,000) | 3,000,000
Other Income |  |  |  |
Interest income |  | 0 | 0 | 0
Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] |  |  |  |
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 0 | (26,000,000) | 7,000,000
Other Income |  |  |  |
Interest income |  | 11,000,000 | 12,000,000 | 11,000,000
Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 31,000,000 | 3,000,000 | 23,000,000
Other Income |  |  |  |
Interest income |  | 6,000,000 | 5,000,000 | 0
Other International Segment [Member] | Operating Segments [Member] |  |  |  |
Foreign Currency Transaction [Abstract] |  |  |  |
Foreign Currency Transaction Gain Loss After Tax |  | 1,000,000 | 0 | 1,000,000
Other Income |  |  |  |
Interest income |  | $ 0 | $ 0 | $ 0
[1] | *See Note 7—Investment in Cenovus Energy, for additional information.

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