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Segment Disclosures and Related Information - Net Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | $ (450) | $ 3,056 | $ (1,929) | $ 6,469
Alaska [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | (16) | 306 | (76) | 1,152
Lower 48 [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | (78) | 26 | (880) | 425
Canada [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | (75) | 51 | (270) | 273
Europe, Middle East and North Africa [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 92 | 2,171 | 318 | 3,050
Asia Pacific [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 25 | 443 | 945 | 1,220
Other International [Member] | Operating Segments [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | (8) | 73 | 14 | 285
Corporate and Other [Member] | Corporate, Non-Segment [Member] |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | $ (390) | $ (14) | $ (1,980) | $ 64

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