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Segment Disclosures and Related Information - Net Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | $ 1,861 | $ 420 | $ 4,389 | $ (2,434) |
Assets [Abstract] |  |  |  |  |
Assets | 70,556 |  | 70,556 |  | $ 73,362
Alaska [Member] | Operating Segments [Member] |  |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 427 | 103 | 1,369 | 291 |
Assets [Abstract] |  |  |  |  |
Assets | 12,688 |  | 12,688 |  | 12,108
Lower 48 [Member] | Operating Segments [Member] |  |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 513 | (97) | 1,231 | (2,995) |
Assets [Abstract] |  |  |  |  |
Assets | 15,308 |  | 15,308 |  | 14,632
Canada [Member] | Operating Segments [Member] |  |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 34 | 280 | 2 | 2,607 |
Assets [Abstract] |  |  |  |  |
Assets | 5,950 |  | 5,950 |  | 6,214
Europe and North Africa [Member] | Operating Segments [Member] |  |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 241 | 85 | 776 | 379 |
Assets [Abstract] |  |  |  |  |
Assets | 11,895 |  | 11,895 |  | 11,870
Asia Pacific and Middle East [Member] | Operating Segments [Member] |  |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 577 | 396 | 1,504 | (1,540) |
Assets [Abstract] |  |  |  |  |
Assets | 16,611 |  | 16,611 |  | 16,985
Other International [Member] | Operating Segments [Member] |  |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | 316 | (20) | 267 | (77) |
Assets [Abstract] |  |  |  |  |
Assets | 315 |  | 315 |  | 97
Corporate and Other [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Net Income (Loss) Attributable to ConocoPhillips [Abstract] |  |  |  |  |
Consolidated net income (loss) attributable to ConocoPhillips | (247) | $ (327) | (760) | $ (1,099) |
Assets [Abstract] |  |  |  |  |
Assets | $ 7,789 |  | $ 7,789 |  | $ 11,456

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