Segment Information - Additional Information (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Number of reporting segments	3
Sales to individual customers that exceeded 10% of the Company's total sales revenues		$ 0	$ 0
Midstream Reporting Segment [Member]
Segment Reporting Information [Line Items]
Number of operating segments	2
Oil and Gas Exploration and Production Reporting Segment [Member] | Total SA [Member]
Segment Reporting Information [Line Items]
Sales to individual customers that exceeded 10% of the Company's total sales revenues	1,900,000,000
Oil and Gas Exploration and Production Reporting Segment [Member] | Total SA [Member] | Algeria Exceptional Profits Tax Settlement [Member]
Segment Reporting Information [Line Items]
Sales to individual customers that exceeded 10% of the Company's total sales revenues	532,000,000