Long-Term Employee Benefits (Schedule of Fair Value of Pension Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 19,399		$ 17,794
Fair value of plan assets excluding trust receivables and payables	19,797		17,927
Pension trust receivables	312	[1]	463	[1]
Pension trust payables	(710)	[2]	(596)	[2]
DuPont securities held in plan assets	449		457
Percent of plan assets which are DuPont securities	2.00%		3.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,613		2,085
U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,647	[3]	3,624	[3]
Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,928		3,227
Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,714		1,596
Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,236		1,844
Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,059		963
Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	389		396
Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,926		2,959
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,236		1,196
Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	129		127
Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	(80)		(90)
Level 1 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	10,978		9,356
Level 1 Inputs [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,584		1,962
Level 1 Inputs [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,604	[3]	3,576	[3]
Level 1 Inputs [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	3,842		3,166
Level 1 Inputs [Member] | Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	443		391
Level 1 Inputs [Member] | Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	378		114
Level 1 Inputs [Member] | Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	40		36
Level 1 Inputs [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0		0
Level 1 Inputs [Member] | Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0		0
Level 1 Inputs [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	82		109
Level 1 Inputs [Member] | Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	6		4
Level 1 Inputs [Member] | Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	(1)		(2)
Level 2 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	4,309		4,071
Level 2 Inputs [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	29		123
Level 2 Inputs [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	25	[3]	20	[3]
Level 2 Inputs [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	86		61
Level 2 Inputs [Member] | Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,271		1,205
Level 2 Inputs [Member] | Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,831		1,700
Level 2 Inputs [Member] | Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,017		923
Level 2 Inputs [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2		4
Level 2 Inputs [Member] | Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	4		0
Level 2 Inputs [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0		0
Level 2 Inputs [Member] | Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	123		123
Level 2 Inputs [Member] | Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	(79)		(88)
Level 3 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	4,510		4,500
Level 3 Inputs [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	18	[3]	28	[3]
Level 3 Inputs [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	27		30
Level 3 Inputs [Member] | Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2		4
Level 3 Inputs [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	387		392
Level 3 Inputs [Member] | Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	2,922		2,959
Level 3 Inputs [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	1,154		1,087
Level 3 Inputs [Member] | Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	0		0
Level 3 Inputs [Member] | Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Total fair value of plan assets	$ 0		$ 0

[1] Primarily receivables for investment securities sold.

[2] Primarily payables for investment securities purchased.

[3] The company's pension plans directly held $449 (2 percent of total plan assets) and $457 (3 percent of total plan assets) of DuPont common stock at December 31, 2012 and 2011, respectively.