Supplementary Information - Condensed Consolidating Financial Information - Cash Flow (Details 2) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	$ 13,995	$ 11,941
Net cash provided by (used in) discontinued operations	143	235
Net Cash Provided by (Used in) Operating Activities	14,138	12,176
Cash Flows From Investing Activities
Capital expenditures and investments	(12,729)	(11,281)
Proceeds from asset dispositions	1,434	3,175
Net sales (purchases) of short-term investments	(109)	1
Collection of advances/loans-related parties	143	130
Other	(454)	(51)
Net cash provided by (used in) continuing investing activities	(11,715)	(8,026)
Net cash used in discontinued operations	(59)	(540)
Net Cash Provided by (Used in) Investing Activities	(11,774)	(8,566)
Cash Flows From Financing Activities
Repayment of debt	(505)	(946)
Change in restricted cash		748
Issuance of company common stock	27	12
Dividends paid	(2,618)	(2,481)
Other	(20)	(593)
Net cash provided by (used in) continuing financing activities	(3,116)	(3,260)
Net Cash Provided by (Used in) Financing Activities	(3,116)	(3,260)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(86)	(85)
Net Change in Cash and Cash Equivalents	(838)	265
Cash and cash equivalents at beginning of period	6,246	3,618
Cash and Cash Equivalents at End of Period	5,408	3,883
ConocoPhillips [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	14,722	(377)	[1]
Net Cash Provided by (Used in) Operating Activities	14,722	(377)	[1]
Cash Flows From Investing Activities
Proceeds from asset dispositions	16,912
Intercompany cash management	(28,922)	1,793	[1]
Net cash provided by (used in) continuing investing activities	(12,010)	1,793	[1]
Net Cash Provided by (Used in) Investing Activities	(12,010)	1,793	[1]
Cash Flows From Financing Activities
Repayment of debt	(400)
Change in restricted cash		748	[1]
Issuance of company common stock	308	313	[1]
Dividends paid	(2,618)	(2,481)	[1]
Other	(2)	2	[1]
Net cash provided by (used in) continuing financing activities	(2,712)	(1,418)	[1]
Net Cash Provided by (Used in) Financing Activities	(2,712)	(1,418)	[1]
Net Change in Cash and Cash Equivalents		(2)	[1]
Cash and cash equivalents at beginning of period		2	[1]
ConocoPhillips Company [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	(146)	2,959	[1]
Net cash provided by (used in) discontinued operations	202	91	[1]
Net Cash Provided by (Used in) Operating Activities	56	3,050	[1]
Cash Flows From Investing Activities
Capital expenditures and investments	(3,235)	(1,456)	[1]
Proceeds from asset dispositions	1,386	581	[1]
Long-term advances/loans-related parties	(635)	(283)	[1]
Collection of advances/loans-related parties	47	153	[1]
Intercompany cash management	33,392	(432)	[1]
Other	(429)	3	[1]
Net cash provided by (used in) continuing investing activities	30,526	(1,434)	[1]
Net cash used in discontinued operations	133	(52)	[1]
Net Cash Provided by (Used in) Investing Activities	30,659	(1,486)	[1]
Cash Flows From Financing Activities
Issuance of debt		523	[1]
Repayment of debt	(16)	(1,939)	[1]
Dividends paid	(15,088)
Other	(16,863)	39	[1]
Net cash provided by (used in) continuing financing activities	(31,967)	(1,377)	[1]
Net Cash Provided by (Used in) Financing Activities	(31,967)	(1,377)	[1]
Effect of Exchange Rate Changes on Cash and Cash Equivalents		(9)	[1]
Net Change in Cash and Cash Equivalents	(1,252)	178	[1]
Cash and cash equivalents at beginning of period	2,434	12	[1]
Cash and Cash Equivalents at End of Period	1,182	190	[1]
ConocoPhillips Australia Funding Company [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities		(2)	[1]
Net Cash Provided by (Used in) Operating Activities		(2)	[1]
Cash Flows From Investing Activities
Collection of advances/loans-related parties		750	[1]
Net cash provided by (used in) continuing investing activities		750	[1]
Net Cash Provided by (Used in) Investing Activities		750	[1]
Cash Flows From Financing Activities
Repayment of debt		(750)	[1]
Dividends paid		(4)	[1]
Net cash provided by (used in) continuing financing activities		(754)	[1]
Net Cash Provided by (Used in) Financing Activities		(754)	[1]
Net Change in Cash and Cash Equivalents		(6)	[1]
Cash and cash equivalents at beginning of period		6
ConocoPhillips Canada Funding Company I [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	10	(1)	[1]
Net Cash Provided by (Used in) Operating Activities	10	(1)	[1]
Cash Flows From Investing Activities
Collection of advances/loans-related parties		2	[1]
Net cash provided by (used in) continuing investing activities		2	[1]
Net Cash Provided by (Used in) Investing Activities		2	[1]
Cash Flows From Financing Activities
Net Change in Cash and Cash Equivalents	10	1	[1]
Cash and cash equivalents at beginning of period	229	59	[1]
Cash and Cash Equivalents at End of Period	239	60	[1]
All Other Subsidiaries [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	14,423	10,978	[1]
Net cash provided by (used in) discontinued operations	394	579	[1]
Net Cash Provided by (Used in) Operating Activities	14,817	11,557	[1]
Cash Flows From Investing Activities
Capital expenditures and investments	(11,132)	(9,825)	[1]
Proceeds from asset dispositions	105	2,646	[1]
Net sales (purchases) of short-term investments	(109)	1	[1]
Long-term advances/loans-related parties	(7)	(541)	[1]
Collection of advances/loans-related parties	112	2,026	[1]
Intercompany cash management	(4,470)	(1,361)	[1]
Other	(25)	(54)	[1]
Net cash provided by (used in) continuing investing activities	(15,526)	(7,108)	[1]
Net cash used in discontinued operations	(59)	(540)	[1]
Net Cash Provided by (Used in) Investing Activities	(15,585)	(7,648)	[1]
Cash Flows From Financing Activities
Issuance of debt	642	301	[1]
Repayment of debt	(105)	(1,058)	[1]
Dividends paid	(458)	(2,257)	[1]
Other	1,514	(686)	[1]
Net cash provided by (used in) continuing financing activities	1,593	(3,700)	[1]
Net cash provided by (used in) discontinued operations	(335)	(39)	[1]
Net Cash Provided by (Used in) Financing Activities	1,258	(3,739)	[1]
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(86)	(76)	[1]
Net Change in Cash and Cash Equivalents	404	94	[1]
Cash and cash equivalents at beginning of period	3,583	3,539	[1]
Cash and Cash Equivalents at End of Period	3,987	3,633	[1]
Consolidating Adjustments [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	(15,014)	(1,616)	[1]
Net cash provided by (used in) discontinued operations	(453)	(435)	[1]
Net Cash Provided by (Used in) Operating Activities	(15,467)	(2,051)	[1]
Cash Flows From Investing Activities
Capital expenditures and investments	1,638
Proceeds from asset dispositions	(16,969)	(52)	[1]
Long-term advances/loans-related parties	642	824	[1]
Collection of advances/loans-related parties	(16)	(2,801)	[1]
Net cash provided by (used in) continuing investing activities	(14,705)	(2,029)	[1]
Net cash used in discontinued operations	(133)	52	[1]
Net Cash Provided by (Used in) Investing Activities	(14,838)	(1,977)	[1]
Cash Flows From Financing Activities
Issuance of debt	(642)	(824)	[1]
Repayment of debt	16	2,801	[1]
Issuance of company common stock	(281)	(301)	[1]
Dividends paid	15,546	2,261	[1]
Other	15,331	52	[1]
Net cash provided by (used in) continuing financing activities	29,970	3,989	[1]
Net cash provided by (used in) discontinued operations	335	39	[1]
Net Cash Provided by (Used in) Financing Activities	$ 30,305	$ 4,028	[1]

[1] *Revised to reflect intercompany cash management activities previously presented as cash flows from continuing operating activities as both continuing activities and discontinued operations in "Cash Flows from Investing Activities" and "Cash Flows From Financing Activities." There was no impact on Total Consolidated balances.