Segment Disclosures - Net Income, Investments, Total Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	$ 9,156	$ 8,428	$ 12,436
Investments In and Advances To Affiliates
Investments in and advances to affiliates	24,337	23,948	32,660
Total Assets
Total assets	118,057	117,144	153,230
Alaska State [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	2,274	2,276	1,984
Investments In and Advances To Affiliates
Investments in and advances to affiliates	53	56	58
Total Assets
Total assets	11,662	10,950	10,723
Lower 48 and Latin America [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	1,081	1,029	1,288
Investments In and Advances To Affiliates
Investments in and advances to affiliates	905	1,133	1,168
Total Assets
Total assets	29,571	28,895	25,872
Canada [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	718	(684)	91
Investments In and Advances To Affiliates
Investments in and advances to affiliates	10,273	9,973	9,045
Total Assets
Total assets	22,394	22,308	20,847
Europe [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	1,199	1,498	1,830
Investments In and Advances To Affiliates
Investments in and advances to affiliates	216	242	195
Total Assets
Total assets	17,299	15,562	12,452
Asia Pacific and Middle East [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	3,532	3,928	3,032
Investments In and Advances To Affiliates
Investments in and advances to affiliates	12,806	12,468	11,571
Total Assets
Total assets	25,473	23,721	22,374
Other International [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	(6)	359	(377)
Investments In and Advances To Affiliates
Investments in and advances to affiliates	68	61	339
Total Assets
Total assets	1,610	1,418	1,542
Lukoil [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips			239
Corporate and Other [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	(820)	(993)	(960)
Investments In and Advances To Affiliates
Investments in and advances to affiliates	16	15	9
Total Assets
Total assets	8,367	6,823	8,485
Discontinued Operations [Member]
Net Income Attributable to ConocoPhillips
Consolidated net income attributable to ConocoPhillips	1,178	1,015	5,309
Investments In and Advances To Affiliates
Investments in and advances to affiliates			10,275
Total Assets
Total assets	$ 1,681	$ 7,467	$ 50,935