Industry Segments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended		1 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2013 segment	Jun. 30, 2013	Sep. 30, 2012 segment	Sep. 30, 2013 segment	Sep. 30, 2012 segment	May 31, 2013 Brazilian chemical facility	Sep. 30, 2013 Operating segments Oil and Gas	Sep. 30, 2012 Operating segments Oil and Gas	Sep. 30, 2013 Operating segments Oil and Gas	Sep. 30, 2012 Operating segments Oil and Gas	Sep. 30, 2013 Operating segments Chemical	Sep. 30, 2012 Operating segments Chemical	Sep. 30, 2013 Operating segments Chemical	Sep. 30, 2012 Operating segments Chemical	Sep. 30, 2013 Operating segments Chemical Brazilian chemical facility	Sep. 30, 2013 Operating segments Midstream and Marketing	Sep. 30, 2012 Operating segments Midstream and Marketing	Sep. 30, 2013 Operating segments Midstream and Marketing	Sep. 30, 2012 Operating segments Midstream and Marketing	Sep. 30, 2013 Corporate and Eliminations	Sep. 30, 2012 Corporate and Eliminations	Sep. 30, 2013 Corporate and Eliminations	Sep. 30, 2012 Corporate and Eliminations
Industry Segments
Number of operating segments	3		3	3	3
Segment Information
Net sales	$ 6,449		$ 5,965	$ 18,283	$ 18,001		$ 5,018	$ 4,635	$ 14,179	$ 14,032	$ 1,200	$ 1,119	$ 3,562	$ 3,439		$ 442	$ 389	$ 1,164	$ 1,044	$ (211)	$ (178)	$ (622)	$ (514)
Pretax operating profit (loss)	2,625		2,234	7,056	7,140		2,363	2,026	6,383	6,573	181	162	615	540		212	156	475	364	(131)	(110)	(417)	(337)
Income taxes	(1,037)		(855)	(2,782)	(2,869)															(1,037)	(855)	(2,782)	(2,869)
Discontinued operations, net	(5)		(4)	(14)	(9)															(5)	(4)	(14)	(9)
Net income (loss)	1,583		1,375	4,260	4,262		2,363	2,026	6,383	6,573	181	162	615	540		212	156	475	364	(1,173)	(969)	(3,213)	(3,215)
Charge for former executives and consultants		55																				55
Gain on sale of equity investment				$ 131		$ 131									$ 131