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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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