Long-Term Employee Benefits (Schedule of Fair Value of Pension Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010
Total fair value of plan assets	$ 17,927		$ 18,580
Pension trust receivables	463	[1]	471	[1]
Pension trust payables	(596)	[2]	(648)	[2]
Total plan assets	17,794		18,403
DuPont securities held in plan assets	457		498
Percent of plan assets which are DuPont securities	3.00%		3.00%
Cash and Cash Equivalents [Member]
Total fair value of plan assets	2,085		2,603
U.S. Equity Securities [Member]
Total fair value of plan assets	3,624	[3]	4,016	[3]
Non-U.S. Equity Securities [Member]
Total fair value of plan assets	3,227		3,663
Debt - government issued [Member]
Total fair value of plan assets	1,596		1,514
Debt - corporate issued [Member]
Total fair value of plan assets	1,844		1,813
Debt - Asset-backed [Member]
Total fair value of plan assets	963		970
Hedge funds [Member]
Total fair value of plan assets	396
Private market securities [Member]
Total fair value of plan assets	2,959		2,931
Real Estate [Member]
Total fair value of plan assets	1,196		1,049
Derivatives - Asset Position [Member]
Total fair value of plan assets	127		95
Derivatives - Liability Position [Member]
Total fair value of plan assets	(90)		(75)
Other [Member]
Total fair value of plan assets			1
Level 1 Inputs [Member]
Total fair value of plan assets	9,356		10,614
Level 1 Inputs [Member] | Cash and Cash Equivalents [Member]
Total fair value of plan assets	1,962		2,535
Level 1 Inputs [Member] | U.S. Equity Securities [Member]
Total fair value of plan assets	3,576	[3]	3,964	[3]
Level 1 Inputs [Member] | Non-U.S. Equity Securities [Member]
Total fair value of plan assets	3,166		3,602
Level 1 Inputs [Member] | Debt - government issued [Member]
Total fair value of plan assets	391		195
Level 1 Inputs [Member] | Debt - corporate issued [Member]
Total fair value of plan assets	114		151
Level 1 Inputs [Member] | Debt - Asset-backed [Member]
Total fair value of plan assets	36		43
Level 1 Inputs [Member] | Hedge funds [Member]
Total fair value of plan assets	0
Level 1 Inputs [Member] | Private market securities [Member]
Total fair value of plan assets	0		0
Level 1 Inputs [Member] | Real Estate [Member]
Total fair value of plan assets	109		118
Level 1 Inputs [Member] | Derivatives - Asset Position [Member]
Total fair value of plan assets	4		6
Level 1 Inputs [Member] | Derivatives - Liability Position [Member]
Total fair value of plan assets	(2)		(1)
Level 1 Inputs [Member] | Other [Member]
Total fair value of plan assets			1
Level 2 Inputs [Member]
Total fair value of plan assets	4,071		4,046
Level 2 Inputs [Member] | Cash and Cash Equivalents [Member]
Total fair value of plan assets	123		68
Level 2 Inputs [Member] | U.S. Equity Securities [Member]
Total fair value of plan assets	20	[3]	32	[3]
Level 2 Inputs [Member] | Non-U.S. Equity Securities [Member]
Total fair value of plan assets	61		61
Level 2 Inputs [Member] | Debt - government issued [Member]
Total fair value of plan assets	1,205		1,319
Level 2 Inputs [Member] | Debt - corporate issued [Member]
Total fair value of plan assets	1,700		1,628
Level 2 Inputs [Member] | Debt - Asset-backed [Member]
Total fair value of plan assets	923		923
Level 2 Inputs [Member] | Hedge funds [Member]
Total fair value of plan assets	4
Level 2 Inputs [Member] | Private market securities [Member]
Total fair value of plan assets	0		0
Level 2 Inputs [Member] | Real Estate [Member]
Total fair value of plan assets	0		0
Level 2 Inputs [Member] | Derivatives - Asset Position [Member]
Total fair value of plan assets	123		89
Level 2 Inputs [Member] | Derivatives - Liability Position [Member]
Total fair value of plan assets	(88)		(74)
Level 2 Inputs [Member] | Other [Member]
Total fair value of plan assets			0
Level 3 Inputs [Member]
Total fair value of plan assets	4,500		3,920
Level 3 Inputs [Member] | Cash and Cash Equivalents [Member]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | U.S. Equity Securities [Member]
Total fair value of plan assets	28	[3]	20	[3]
Level 3 Inputs [Member] | Non-U.S. Equity Securities [Member]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | Debt - government issued [Member]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | Debt - corporate issued [Member]
Total fair value of plan assets	30		34
Level 3 Inputs [Member] | Debt - Asset-backed [Member]
Total fair value of plan assets	4		4
Level 3 Inputs [Member] | Hedge funds [Member]
Total fair value of plan assets	392
Level 3 Inputs [Member] | Private market securities [Member]
Total fair value of plan assets	2,959		2,931
Level 3 Inputs [Member] | Real Estate [Member]
Total fair value of plan assets	1,087		931
Level 3 Inputs [Member] | Derivatives - Asset Position [Member]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | Derivatives - Liability Position [Member]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | Other [Member]
Total fair value of plan assets			$ 0

[1] Primarily receivables for investment securities sold.

[2] Primarily payables for investment securities purchased.

[3] The company's pension plans directly held $457 (3 percent of total plan assets) and $498 (3 percent of total plan assets) of DuPont common stock at December 31, 2011 and 2010, respectively.