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Long-Term Employee Benefits (Schedule of Fair Value of Plan Assets Held in Level 3) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 16,656 |  | $ 17,497 |
Hedge Funds with gates in place |  | 5.00% |  |  |
Remaining useful life private market securities and real estate funds |  | 15 years |  |  |
Hedge Fund lock up period |  | 1 year |  |  |
U.S. Equity Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 4,071 | [1] | 3,873 | [2]
Non-U.S. Equity Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 3,278 |  | 3,597 |
US Treasury and Government [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 2,067 |  | 2,028 |
Debt - corporate issued [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 2,475 |  | 2,374 |
Debt - Asset-backed [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 721 |  | 831 |
Hedge funds [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 1 |  | 1 |
Private market securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 67 |  | 54 |
Real Estate Funds [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 275 |  | 246 |
Investments Measured at Net Asset Value [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 2,294 |  | 2,453 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments |  | 937 |  | 993 |
Investments Measured at Net Asset Value [Member] | US Treasury and Government [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0 |  | 8 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments |  | $ 0 |  | 0 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency |  | Monthly |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period |  | 3 days |  |  |
Investments Measured at Net Asset Value [Member] | Debt - corporate issued [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 0 |  | 6 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments |  | $ 0 |  | 0 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency |  | Monthly |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period |  | 3 days |  |  |
Investments Measured at Net Asset Value [Member] | Hedge funds [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [3] | $ 434 |  | 429 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | [3] | $ 0 |  | 0 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency |  | Monthly, Quarterly |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period, Range |  | Ranges from 3-45 days monthly, 3-90 days quarterly |  |  |
Investments Measured at Net Asset Value [Member] | Private market securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [4] | $ 1,416 |  | 1,553 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | [4] | $ 693 |  | 632 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency |  | Not applicable |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period, Not Applicable |  | Not applicable |  |  |
Investments Measured at Net Asset Value [Member] | Real Estate Funds [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | [4] | $ 444 |  | 457 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments | [4] | $ 244 |  | 361 |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Frequency |  | Not applicable |  |  |
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Investment Redemption, Notice Period, Not Applicable |  | Not applicable |  |  |
Fair Value, Inputs, Level 3 Inputs [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance |  | $ 238 |  | 286 |
Realized (loss) gain |  | (28) |  | (32) |
Change in unrealized (loss) gain |  | 19 |  | (11) |
Purchases, sales and settlements, net |  | (37) |  | (18) |
Transfers in (out) of Level 3 |  | 6 |  | 13 |
Ending balance |  | 198 |  | 238 |
Defined Benefit Plan, Fair Value of Plan Assets |  | 198 |  | 238 |
Fair Value, Inputs, Level 3 Inputs [Member] | U.S. Equity Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance |  | 20 |  | 29 |
Realized (loss) gain |  | (3) |  | (14) |
Change in unrealized (loss) gain |  | 1 |  | 5 |
Purchases, sales and settlements, net |  | 0 |  | 0 |
Transfers in (out) of Level 3 |  | 0 |  | 0 |
Ending balance |  | 18 |  | 20 |
Defined Benefit Plan, Fair Value of Plan Assets |  | 18 | [1] | 20 | [2]
Fair Value, Inputs, Level 3 Inputs [Member] | Non-U.S. Equity Securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance |  | 2 |  | 4 |
Realized (loss) gain |  | 0 |  | 0 |
Change in unrealized (loss) gain |  | (1) |  | (3) |
Purchases, sales and settlements, net |  | 0 |  | 0 |
Transfers in (out) of Level 3 |  | 0 |  | 1 |
Ending balance |  | 1 |  | 2 |
Defined Benefit Plan, Fair Value of Plan Assets |  | 1 |  | 2 |
Fair Value, Inputs, Level 3 Inputs [Member] | US Treasury and Government [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 Inputs [Member] | Debt - corporate issued [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance |  | 34 |  | 15 |
Realized (loss) gain |  | (25) |  | (18) |
Change in unrealized (loss) gain |  | 27 |  | 15 |
Purchases, sales and settlements, net |  | (3) |  | 10 |
Transfers in (out) of Level 3 |  | 6 |  | 12 |
Ending balance |  | 39 |  | 34 |
Defined Benefit Plan, Fair Value of Plan Assets |  | 39 |  | 34 |
Fair Value, Inputs, Level 3 Inputs [Member] | Debt - Asset-backed [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance |  | 1 |  | 1 |
Realized (loss) gain |  | 0 |  | 0 |
Change in unrealized (loss) gain |  | 0 |  | 0 |
Purchases, sales and settlements, net |  | (1) |  | 0 |
Transfers in (out) of Level 3 |  | 0 |  | 0 |
Ending balance |  | 0 |  | 1 |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0 |  | 1 |
Fair Value, Inputs, Level 3 Inputs [Member] | Hedge funds [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Defined Benefit Plan, Fair Value of Plan Assets |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 Inputs [Member] | Private market securities [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance |  | 37 |  | 37 |
Realized (loss) gain |  | 0 |  | 0 |
Change in unrealized (loss) gain |  | 2 |  | (5) |
Purchases, sales and settlements, net |  | 3 |  | 5 |
Transfers in (out) of Level 3 |  | 0 |  | 0 |
Ending balance |  | 42 |  | 37 |
Defined Benefit Plan, Fair Value of Plan Assets |  | 42 |  | 37 |
Fair Value, Inputs, Level 3 Inputs [Member] | Real Estate Funds [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |
Beginning balance |  | 144 |  | 200 |
Realized (loss) gain |  | 0 |  | 0 |
Change in unrealized (loss) gain |  | (10) |  | (23) |
Purchases, sales and settlements, net |  | (36) |  | (33) |
Transfers in (out) of Level 3 |  | 0 |  | 0 |
Ending balance |  | 98 |  | 144 |
Defined Benefit Plan, Fair Value of Plan Assets |  | $ 98 |  | $ 144 |
[1] | The company's pension plans directly held $732 (4 percent of total plan assets) of DuPont common stock at December 31, 2016.
[2] | The company's pension plans directly held $664 (4 percent of total plan assets) of DuPont common stock at December 31, 2015.
[3] | 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.
[4] | The remaining life of private market securities and real estate funds is an average of 15 years per investment.

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