Long-Term Employee Benefits (Schedule of Fair Value of Pension Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 20,446		$ 20,614
Fair value of plan assets excluding trust receivables and payables	20,786		20,884
Pension trust receivables	413	[1]	200	[1]
Pension trust payables	(753)	[2]	(470)	[2]
DuPont securities held in plan assets	737		648
Percent of plan assets which are DuPont securities	4.00%		3.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,310		3,076
U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,610	[3]	4,432	[3]
Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,870		4,005
Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,649		2,275
Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,600		1,961
Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	914		925
Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	445		435
Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,296		2,577
Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,065		1,179
Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	106		97
Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(79)		(78)
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	12,178		12,633
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,310		3,073
Fair Value, Inputs, Level 1 [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,566	[3]	4,383	[3]
Fair Value, Inputs, Level 1 [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,813		3,965
Fair Value, Inputs, Level 1 [Member] | Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	990		701
Fair Value, Inputs, Level 1 [Member] | Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	370		376
Fair Value, Inputs, Level 1 [Member] | Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46		51
Fair Value, Inputs, Level 1 [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Fair Value, Inputs, Level 1 [Member] | Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	76		73
Fair Value, Inputs, Level 1 [Member] | Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7		18
Fair Value, Inputs, Level 1 [Member] | Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		(7)
Level 2 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4,843		4,086
Level 2 Inputs [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		3
Level 2 Inputs [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15	[3]	22	[3]
Level 2 Inputs [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	53		37
Level 2 Inputs [Member] | Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,659		1,574
Level 2 Inputs [Member] | Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,215		1,566
Level 2 Inputs [Member] | Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	867		870
Level 2 Inputs [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		1
Level 2 Inputs [Member] | Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	11		5
Level 2 Inputs [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3		0
Level 2 Inputs [Member] | Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	99		79
Level 2 Inputs [Member] | Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(79)		(71)
Level 3 Inputs [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,765		4,165
Level 3 Inputs [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Level 3 Inputs [Member] | U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	29	[3]	27	[3]
Level 3 Inputs [Member] | Non-U.S. Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	4		3
Level 3 Inputs [Member] | Debt - government issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Level 3 Inputs [Member] | Debt - corporate issued [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	15		19
Level 3 Inputs [Member] | Debt - Asset-backed [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1		4
Level 3 Inputs [Member] | Hedge funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	445		434
Level 3 Inputs [Member] | Private market securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2,285		2,572
Level 3 Inputs [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	986		1,106
Level 3 Inputs [Member] | Derivatives - Asset Position [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0		0
Level 3 Inputs [Member] | Derivatives - Liability Position [Member]
Defined Benefit Plan Disclosure [Line Items]
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 $737 (4 percent of total plan assets) and $648 (3 percent of total plan assets) of DuPont common stock at December 31, 2014 and 2013, respectively.