Supplementary Information - Condensed Consolidating Financial Information - Cash Flow (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	$ 6,278	$ 4,608
Net cash provided by (used in) discontinued operations	58	122
Net Cash Provided by (Used in) Operating Activities	6,336	4,730
Cash Flows From Investing Activities
Capital expenditures and investments	(3,895)	(3,391)
Proceeds from asset dispositions	48	1,134
Net sales (purchases) of short-term investments	63	(23)
Collection of advances/loans-related parties	62	57
Other	46	(21)
Net cash provided by (used in) continuing investing activities	(3,676)	(2,244)
Net cash used in discontinued operations	(22)	(189)
Net Cash Provided by (Used in) Investing Activities	(3,698)	(2,433)
Cash Flows From Financing Activities
Repayment of debt	(450)	(48)
Change in restricted cash	0	748
Issuance of company common stock	(32)	(10)
Dividends paid	(855)	(815)
Other	(17)	(205)
Net cash provided by (used in) continuing financing activities	(1,354)	(330)
Net cash provided by (used in) discontinued operations		0
Net Cash Provided by (Used in) Financing Activities	(1,354)	(330)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(10)	(163)
Net Change in Cash and Cash Equivalents	1,274	1,804
Cash and cash equivalents at beginning of period	6,246	3,618
Cash and Cash Equivalents at End of Period	7,520	5,422
ConocoPhillips [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	(134)	(185)	[1]
Net Cash Provided by (Used in) Operating Activities	(134)	(185)	[1]
Cash Flows From Investing Activities
Intercompany cash management	1,325	148	[1]
Net cash provided by (used in) continuing investing activities	1,325	148	[1]
Net Cash Provided by (Used in) Investing Activities	1,325	148	[1]
Cash Flows From Financing Activities
Repayment of debt	(400)
Change in restricted cash		748	[1]
Issuance of company common stock	63	101	[1]
Dividends paid	(855)	(815)	[1]
Other	1	1	[1]
Net cash provided by (used in) continuing financing activities	(1,191)	35	[1]
Net Cash Provided by (Used in) Financing Activities	(1,191)	35	[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	373	1,308	[1]
Net cash provided by (used in) discontinued operations	100	50	[1]
Net Cash Provided by (Used in) Operating Activities	473	1,358	[1]
Cash Flows From Investing Activities
Capital expenditures and investments	(662)	(448)	[1]
Proceeds from asset dispositions	(1)	4	[1]
Long-term advances/loans-related parties	(44)	2	[1]
Collection of advances/loans-related parties	15	14	[1]
Intercompany cash management	1,486	903	[1]
Other	18
Net cash provided by (used in) continuing investing activities	812	475	[1]
Net cash used in discontinued operations	(1)
Net Cash Provided by (Used in) Investing Activities	811	475	[1]
Cash Flows From Financing Activities
Repayment of debt		(1,566)	[1]
Net cash provided by (used in) continuing financing activities		(1,566)	[1]
Net Cash Provided by (Used in) Financing Activities		(1,566)	[1]
Net Change in Cash and Cash Equivalents	1,284	267	[1]
Cash and cash equivalents at beginning of period	2,434	12	[1]
Cash and Cash Equivalents at End of Period	3,718	279	[1]
ConocoPhillips Canada Funding Company I [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	1	(10)	[1]
Net Cash Provided by (Used in) Operating Activities	1	(10)	[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	1	(8)	[1]
Cash and cash equivalents at beginning of period	229	59	[1]
Cash and Cash Equivalents at End of Period	230	51	[1]
All Other Subsidiaries [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	5,976	3,610	[1]
Net cash provided by (used in) discontinued operations	121	239	[1]
Net Cash Provided by (Used in) Operating Activities	6,097	3,849	[1]
Cash Flows From Investing Activities
Capital expenditures and investments	(3,378)	(2,943)	[1]
Proceeds from asset dispositions	49	1,130	[1]
Net sales (purchases) of short-term investments	63	(23)	[1]
Long-term advances/loans-related parties	(2)	(7)	[1]
Collection of advances/loans-related parties	47	1,609	[1]
Intercompany cash management	(2,811)	(1,051)	[1]
Other	(6)	(21)	[1]
Net cash provided by (used in) continuing investing activities	(6,038)	(1,306)	[1]
Net cash used in discontinued operations	(22)	(189)	[1]
Net Cash Provided by (Used in) Investing Activities	(6,060)	(1,495)	[1]
Cash Flows From Financing Activities
Issuance of debt	46	5	[1]
Repayment of debt	(50)	(50)	[1]
Dividends paid	(96)	(343)	[1]
Other	161	(206)	[1]
Net cash provided by (used in) continuing financing activities	61	(594)	[1]
Net cash provided by (used in) discontinued operations	(99)	(50)	[1]
Net Cash Provided by (Used in) Financing Activities	(38)	(644)	[1]
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(10)	(163)	[1]
Net Change in Cash and Cash Equivalents	(11)	1,547	[1]
Cash and cash equivalents at beginning of period	3,583	3,539	[1]
Cash and Cash Equivalents at End of Period	3,572	5,086	[1]
Consolidating Adjustments [Member]
Cash Flows From Operating Activities
Net cash provided by (used in) continuing operating activities	62	(115)	[1]
Net cash provided by (used in) discontinued operations	(163)	(167)	[1]
Net Cash Provided by (Used in) Operating Activities	(101)	(282)	[1]
Cash Flows From Investing Activities
Capital expenditures and investments	145
Long-term advances/loans-related parties	46	5	[1]
Collection of advances/loans-related parties		(1,568)	[1]
Other	34
Net cash provided by (used in) continuing investing activities	225	(1,563)	[1]
Net cash used in discontinued operations	1
Net Cash Provided by (Used in) Investing Activities	226	(1,563)	[1]
Cash Flows From Financing Activities
Issuance of debt	(46)	(5)	[1]
Repayment of debt		1,568	[1]
Issuance of company common stock	(95)	(111)	[1]
Dividends paid	96	343	[1]
Other	(179)
Net cash provided by (used in) continuing financing activities	(224)	1,795	[1]
Net cash provided by (used in) discontinued operations	99	50	[1]
Net Cash Provided by (Used in) Financing Activities	$ (125)	$ 1,845	[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.