Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2011 OilRefinery	Dec. 31, 2013 Phillips 66 and Affiliated Companies [Member]	Dec. 31, 2013 Shell Oil and Affiliates [Member]	Dec. 31, 2012 Shell Oil [Member]	Dec. 31, 2011 Shell Oil [Member]	Dec. 31, 2012 BP [Member]	Dec. 31, 2011 BP [Member]	Dec. 31, 2012 Petronas [Member]	Dec. 31, 2011 Petronas [Member]
Segment Reporting Information [Line Items]
Number of oil refineries sold	2
Percentage of net sales revenue in oil and natural gas production		17.00%	14.00%	17.00%	16.00%	13.00%	15.00%	12.00%	11.00%