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Long-Term Employee Benefits (Schedule of Fair Value of Pension Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 17,497 | $ 20,446 |
Fair value of plan assets excluding trust receivables and payables |  | 17,418 | 20,786 |
Pension trust receivables | [1] | 783 | 413 |
Pension trust payables | [2] | (704) | (753) |
DuPont securities held in plan assets |  | $ 664 | $ 737 |
Percent of plan assets which are DuPont securities |  | 4.00% | 4.00% |
Pension asset fair value hierarchy revision |  |  | $ 566 |
Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | $ 1,962 | 2,310 |
U.S. Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 3,873 | 4,610 |
Non-U.S. Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3,597 | 4,436 |
Debt - government issued [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,036 | 2,649 |
Debt - corporate issued [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,380 | 2,600 |
Debt - Asset-backed [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 831 | 914 |
Hedge funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 430 | 445 |
Private market securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,607 | 1,730 |
Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 703 | 1,065 |
Derivatives - Asset Position [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 58 | 106 |
Derivatives - Liability Position [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | (59) | (79) |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 10,580 | 12,178 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,961 | 2,310 | [4]
Fair Value, Inputs, Level 1 [Member] | U.S. Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 3,843 | 4,566 | [4]
Fair Value, Inputs, Level 1 [Member] | Non-U.S. Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 3,480 | 3,813 | [4]
Fair Value, Inputs, Level 1 [Member] | Debt - government issued [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 852 | 990 | [4]
Fair Value, Inputs, Level 1 [Member] | Debt - corporate issued [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 291 | 370 | [4]
Fair Value, Inputs, Level 1 [Member] | Debt - Asset-backed [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 44 | 46 | [4]
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 |  | 98 | 76 |
Fair Value, Inputs, Level 1 [Member] | Derivatives - Asset Position [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 10 | 7 | [4]
Fair Value, Inputs, Level 1 [Member] | Derivatives - Liability Position [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1 | 0 | [4]
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 4,161 | 5,409 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1 | 0 |
Fair Value, Inputs, Level 2 [Member] | U.S. Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets | [3] | 10 | 15 | [4]
Fair Value, Inputs, Level 2 [Member] | Non-U.S. Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 115 | 619 | [4],[5]
Fair Value, Inputs, Level 2 [Member] | Debt - government issued [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,184 | 1,659 | [4]
Fair Value, Inputs, Level 2 [Member] | Debt - corporate issued [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,055 | 2,215 | [4]
Fair Value, Inputs, Level 2 [Member] | Debt - Asset-backed [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 786 | 867 | [4]
Fair Value, Inputs, Level 2 [Member] | Hedge funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1 | 0 |
Fair Value, Inputs, Level 2 [Member] | Private market securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 17 | 11 |
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 4 | 3 |
Fair Value, Inputs, Level 2 [Member] | Derivatives - Asset Position [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 48 | 99 |
Fair Value, Inputs, Level 2 [Member] | Derivatives - Liability Position [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | (60) | (79) | [4]
Level 3 Inputs [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2,677 | 3,199 |
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 | [3] | 20 | 29 |
Level 3 Inputs [Member] | Non-U.S. Equity Securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 2 | 4 |
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 |  | 34 | 15 |
Level 3 Inputs [Member] | Debt - Asset-backed [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1 | 1 |
Level 3 Inputs [Member] | Hedge funds [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 429 | 445 |
Level 3 Inputs [Member] | Private market securities [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 1,590 | 1,719 | [5]
Level 3 Inputs [Member] | Real Estate [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  | 601 | 986 |
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 |
Performance Chemicals [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  |  | 109 |
Performance Chemicals [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Fair value of plan assets |  |  | $ 1,090 |
[1] | Primarily receivables for investment securities sold.
[2] | Primarily payables for investment securities purchased.
[3] | The company's pension plans directly held $664 (4 percent of total plan assets) and $737 (4 percent of total plan assets) of DuPont common stock at December 31, 2015 and 2014, respectively.
[4] | The company's pension assets by fair value hierarchy table at December 31, 2014 included approximately $109 of Level 1 assets and $1,090 of Level 2 assets that were transferred to Chemours upon completion of the spin-off transaction.
[5] | The company’s pension assets by fair value hierarchy table at December 31, 2014 have been revised for the following correction: increase in Level 2 - Non-U.S. Equity Securities of $566 with a corresponding reduction in Level 3 - Private Market Securities.

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