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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.