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Segment Disclosures - Net Income (Loss), Investments, Total Assets (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 18, 2018
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | $ 7,189 | $ 6,257 | $ (855) |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 8,453 | 9,340 | 9,590 |
Total Assets |  |  |  |
Total assets | 70,514 | 69,980 | 73,362 |
Corporate, Non-Segment [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | 38 | (1,667) | (2,136) |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 0 | 0 | 0 |
Total Assets |  |  |  |
Total assets | 11,164 | 8,573 | 11,456 |
Alaska Segment [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | 1,466 | 1,814 | 1,520 |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 83 |  | 56 | $ 86
Total Assets |  |  |  |
Total assets | 15,453 |  | 12,108 | 14,648
Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | (2,371) | 1,747 | 436 |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 35 |  | 402 | 378
Total Assets |  |  |  |
Total assets | 14,425 |  | 14,632 | 14,888
Canada Segment [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | 2,564 | 63 | 279 |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 0 |  | 0 | 0
Total Assets |  |  |  |
Total assets | 6,350 |  | 6,214 | 5,748
Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | 1,116 | 2,594 | 3,170 |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 1,070 |  | 1,402 | 1,311
Total Assets |  |  |  |
Total assets | 9,269 |  | 13,346 | 11,276
Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | (1,661) | 1,342 | 1,483 |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 7,265 |  | 7,730 | 7,565
Total Assets |  |  |  |
Total assets | 13,568 |  | 15,509 | 14,758
Other International Segment [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips |  |  |  |
Net income (loss) attributable to ConocoPhillips | 167 | $ 364 | 263 |
Investments In and Advances To Affiliates |  |  |  |
Investments in and advances to affiliates | 0 |  | 0 | 0
Total Assets |  |  |  |
Total assets | $ 285 |  | $ 97 | $ 89

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