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Long-Term Employee Benefits (Schedule of Fair Value of Pension Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 16,656 |  | $ 17,497 |
Fair value of plan assets excluding trust receivables and payables and assets measured at NAV |  | 14,470 |  | 14,965 |
Pension trust receivables |  | 264 | [1] | 783 | [2]
Pension trust payables |  | (372) | [3] | (704) | [4]
DuPont securities held in plan assets |  | $ 732 |  | $ 664 |
Percent of plan assets which are DuPont securities |  | 4.00% |  | 4.00% |
Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | $ 1,505 |  | $ 1,962 |
U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 4,071 | [5] | 3,873 | [6]
Non-U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 3,278 |  | 3,597 |
Debt - government issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 2,067 |  | 2,028 |
Debt - corporate issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 2,475 |  | 2,374 |
Debt - Asset-backed [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 721 |  | 831 |
Hedge funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 1 |  | 1 |
Private market securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 67 |  | 54 |
Real Estate Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 275 |  | 246 |
Derivatives - Asset Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 53 |  | 58 |
Derivatives - Liability Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | (47) |  | (59) |
Other Assets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 4 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 9,997 |  | 10,580 |
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 1,480 |  | 1,961 |
Fair Value, Inputs, Level 1 [Member] | U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 4,033 | [5] | 3,843 | [6]
Fair Value, Inputs, Level 1 [Member] | Non-U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 3,126 |  | 3,480 |
Fair Value, Inputs, Level 1 [Member] | Debt - government issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 864 |  | 852 |
Fair Value, Inputs, Level 1 [Member] | Debt - corporate issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 273 |  | 291 |
Fair Value, Inputs, Level 1 [Member] | Debt - Asset-backed [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 39 |  | 44 |
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 Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 175 |  | 98 |
Fair Value, Inputs, Level 1 [Member] | Derivatives - Asset Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 7 |  | 10 |
Fair Value, Inputs, Level 1 [Member] | Derivatives - Liability Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 1 |
Fair Value, Inputs, Level 1 [Member] | Other Assets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 4,275 |  | 4,147 |
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 25 |  | 1 |
Fair Value, Inputs, Level 2 [Member] | U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 20 | [5] | 10 | [6]
Fair Value, Inputs, Level 2 [Member] | Non-U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 151 |  | 115 |
Fair Value, Inputs, Level 2 [Member] | Debt - government issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 1,203 |  | 1,176 |
Fair Value, Inputs, Level 2 [Member] | Debt - corporate issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 2,163 |  | 2,049 |
Fair Value, Inputs, Level 2 [Member] | Debt - Asset-backed [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 682 |  | 786 |
Fair Value, Inputs, Level 2 [Member] | Hedge funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 1 |  | 1 |
Fair Value, Inputs, Level 2 [Member] | Private market securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 25 |  | 17 |
Fair Value, Inputs, Level 2 [Member] | Real Estate Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 2 |  | 4 |
Fair Value, Inputs, Level 2 [Member] | Derivatives - Asset Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 46 |  | 48 |
Fair Value, Inputs, Level 2 [Member] | Derivatives - Liability Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | (47) |  | (60) |
Fair Value, Inputs, Level 2 [Member] | Other Assets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 4 |  |  |
Fair Value, Inputs, Level 3 Inputs [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 198 |  | 238 |
Fair Value, Inputs, Level 3 Inputs [Member] | Cash and Cash Equivalents [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 Inputs [Member] | U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 18 | [5] | 20 | [6]
Fair Value, Inputs, Level 3 Inputs [Member] | Non-U.S. Equity Securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 1 |  | 2 |
Fair Value, Inputs, Level 3 Inputs [Member] | Debt - government issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 Inputs [Member] | Debt - corporate issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 39 |  | 34 |
Fair Value, Inputs, Level 3 Inputs [Member] | Debt - Asset-backed [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 1 |
Fair Value, Inputs, Level 3 Inputs [Member] | Hedge funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 Inputs [Member] | Private market securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 42 |  | 37 |
Fair Value, Inputs, Level 3 Inputs [Member] | Real Estate Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 98 |  | 144 |
Fair Value, Inputs, Level 3 Inputs [Member] | Derivatives - Asset Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 Inputs [Member] | Derivatives - Liability Position [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 Inputs [Member] | Other Assets [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  |  |
Investments Measured at Net Asset Value [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 2,294 |  | 2,453 |
Investments Measured at Net Asset Value [Member] | Debt - government issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 8 |
Investments Measured at Net Asset Value [Member] | Debt - corporate issued [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets |  | 0 |  | 6 |
Investments Measured at Net Asset Value [Member] | Hedge funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [7] | 434 |  | 429 |
Investments Measured at Net Asset Value [Member] | Private market securities [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [8] | 1,416 |  | 1,553 |
Investments Measured at Net Asset Value [Member] | Real Estate Funds [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Fair value of plan assets | [8] | $ 444 |  | $ 457 |
[1] | Primarily receivables for investment securities sold.
[2] | Primarily receivables for investment securities sold.
[3] | Primarily payables for investment securities purchased.
[4] | Primarily payables for investment securities purchased.
[5] | The company's pension plans directly held $732 (4 percent of total plan assets) of DuPont common stock at December 31, 2016.
[6] | The company's pension plans directly held $664 (4 percent of total plan assets) of DuPont common stock at December 31, 2015.
[7] | Less than 5 percent of hedge funds have gates in place at the investor level for year end redemptions. Hedge funds also contain either no lock up or a lock up period of less than 1 year.
[8] | The remaining life of private market securities and real estate funds is an average of 15 years per investment.

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