Condensed Consolidating Financial Information (Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents	$ 5,400		$ 3,474		$ 0	$ 0
Accounts and notes receivable	9,632		10,403
Inventories	3,354		3,430
Prepaid expenses and other current assets	851		655
Total Current Assets	19,237		17,962
Investments and long-term receivables	11,220		10,471
Net properties, plants and equipment	15,398	[1]	15,407	[1]
Goodwill	3,096		3,344		3,332
Intangibles	698		724
Other assets	149		165
Total Assets	49,798		48,073		43,211
Liabilities and Equity
Accounts payable	11,090		10,710
Short-term debt	24		13
Accrued income and other taxes	872		901
Employee benefit obligations	476		441
Other accruals	469		417
Total Current Liabilities	12,931		12,482
Long-term debt	6,131		6,961
Asset retirement obligations and accrued environmental costs	700		740
Deferred income taxes	6,125		5,444
Employee benefit obligations	921		1,325
Other liabilities and deferred credits	598		315
Total Liabilities	27,406		27,267
Common stock	16,291
Retained earnings	5,622		2,713
Net ConocoPhillips investments			18,376
Accumulated other comprehensive income (loss)	37		(314)		122	214
Noncontrolling interests	442		31
Total Liabilities and Equity	49,798		48,073
Consolidating Adjustments [Member]
Assets
Cash and cash equivalents	0		0		0	0
Accounts and notes receivable	(684)		(989)
Inventories	0		0
Prepaid expenses and other current assets	0		0
Total Current Assets	(684)		(989)
Investments and long-term receivables	(56,868)		(45,635)
Net properties, plants and equipment	0		0
Goodwill	0		0
Intangibles	0		0
Other assets	(4)		(36)
Total Assets	(57,556)		(46,660)
Liabilities and Equity
Accounts payable	(684)		(989)
Short-term debt	0		0
Accrued income and other taxes	0		0
Employee benefit obligations	0		0
Other accruals	0		0
Total Current Liabilities	(684)		(989)
Long-term debt	0		0
Asset retirement obligations and accrued environmental costs	0		0
Deferred income taxes	(4)		(36)
Employee benefit obligations	0		0
Other liabilities and deferred credits	(14,048)		(8,321)
Total Liabilities	(14,736)		(9,346)
Common stock	(34,240)
Retained earnings	(8,224)		(3,232)
Net ConocoPhillips investments			(34,100)
Accumulated other comprehensive income (loss)	(356)		18
Noncontrolling interests	0		0
Total Liabilities and Equity	(57,556)		(46,660)
Phillips 66 [Member]
Assets
Cash and cash equivalents	0		0		0	0
Accounts and notes receivable	9		47
Inventories	0		0
Prepaid expenses and other current assets	10		11
Total Current Assets	19		58
Investments and long-term receivables	33,178		28,934
Net properties, plants and equipment	0		0
Goodwill	0		0
Intangibles	0		0
Other assets	40		78
Total Assets	33,237		29,070
Liabilities and Equity
Accounts payable	1		17
Short-term debt	0		0
Accrued income and other taxes	0		0
Employee benefit obligations	0		0
Other accruals	49		50
Total Current Liabilities	50		67
Long-term debt	5,796		6,795
Asset retirement obligations and accrued environmental costs	0		0
Deferred income taxes	0		0
Employee benefit obligations	0		0
Other liabilities and deferred credits	5,441		1,433
Total Liabilities	11,287		8,295
Common stock	16,291
Retained earnings	5,622		2,713
Net ConocoPhillips investments			18,376
Accumulated other comprehensive income (loss)	37		(314)
Noncontrolling interests	0		0
Total Liabilities and Equity	33,237		29,070
Phillips 66 Company [Member]
Assets
Cash and cash equivalents	2,162		2,410		0	0
Accounts and notes receivable	2,176		2,889
Inventories	1,962		1,938
Prepaid expenses and other current assets	368		403
Total Current Assets	6,668		7,640
Investments and long-term receivables	27,414		20,937
Net properties, plants and equipment	12,031		11,714
Goodwill	3,094		3,344
Intangibles	694		710
Other assets	112		114
Total Assets	50,013		44,459
Liabilities and Equity
Accounts payable	7,508		7,014
Short-term debt	18		13
Accrued income and other taxes	250		245
Employee benefit obligations	422		391
Other accruals	178		279
Total Current Liabilities	8,376		7,942
Long-term debt	152		165
Asset retirement obligations and accrued environmental costs	527		563
Deferred income taxes	5,045		4,478
Employee benefit obligations	724		1,094
Other liabilities and deferred credits	2,153		1,435
Total Liabilities	16,977		15,677
Common stock	25,938
Retained earnings	7,061		3,145
Net ConocoPhillips investments			25,951
Accumulated other comprehensive income (loss)	37		(314)
Noncontrolling interests	0		0
Total Liabilities and Equity	50,013		44,459
All Other Subsidiaries [Member]
Assets
Cash and cash equivalents	3,238		1,064		0	0
Accounts and notes receivable	8,131		8,456
Inventories	1,392		1,492
Prepaid expenses and other current assets	473		241
Total Current Assets	13,234		11,253
Investments and long-term receivables	7,496		6,235
Net properties, plants and equipment	3,367		3,693
Goodwill	2		0
Intangibles	4		14
Other assets	1		9
Total Assets	24,104		21,204
Liabilities and Equity
Accounts payable	4,265		4,668
Short-term debt	6		0
Accrued income and other taxes	622		656
Employee benefit obligations	54		50
Other accruals	242		88
Total Current Liabilities	5,189		5,462
Long-term debt	183		1
Asset retirement obligations and accrued environmental costs	173		177
Deferred income taxes	1,084		1,002
Employee benefit obligations	197		231
Other liabilities and deferred credits	7,052		5,768
Total Liabilities	13,878		12,641
Common stock	8,302
Retained earnings	1,163		87
Net ConocoPhillips investments			8,149
Accumulated other comprehensive income (loss)	319		296
Noncontrolling interests	442		31
Total Liabilities and Equity	$ 24,104		$ 21,204

[1] At December 31, 2013, net PP&E of $58 million associated with discontinued operations was classified as current assets.