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Pension Plans and Other Post Employment Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Retirement Benefits [Abstract]  
Schedule of Assumptions Used [Table Text Block]
The weighted-average assumptions used to determine benefit obligations for OPEB plans are summarized in the table below:
Weighted-Average Assumptions used to Determine Benefit Obligations
Successor
Predecessor
 
December 31, 2017
December 31, 2016
Discount rate
3.56
%
4.03
%

The weighted-average assumptions used to determine net periodic benefit costs for the OPEB plans are summarized in the two tables below:
Weighted-Average Assumptions used to Determine Net Periodic Benefit Cost
Successor
Predecessor
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
For the Year Ended December 31, 2016
For the Year Ended December 31, 2015
Discount rate
3.62
%
4.03
%
3.87
%
4.13
%

Assumed Health Care Cost Trend Rates

Successor
Predecessor
 
December 31, 2017
December 31, 2016
Health care cost trend rate assumed for next year
6.40
%
7.00
%
Rate to which the cost trend rate is assumed to decline (the ultimate health care trend rate)
5.00
%
5.00
%
Year that the rate reached the ultimate health care cost trend rate
2023

2023

The weighted-average assumptions used to determine pension plan obligations for all pension plans are summarized in the table below:
Weighted-Average Assumptions used to Determine Benefit Obligations
Successor
Predecessor
 
December 31, 2017
December 31, 2016
Discount rate
3.37
%
3.80
%
Rate of increase in future compensation levels 1
4.04
%
3.80
%
1.
The rate of compensation increase represents the single annual effective salary increase that an average plan participant would receive during the participant's entire career at the company.
  
The weighted-average assumptions used to determine net periodic benefit costs for all pension plans are summarized in the two tables below:
Weighted-Average Assumptions used to Determine Net Periodic Benefit Cost
Successor
Predecessor
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
For the Year Ended December 31, 2016
For the Year Ended December 31, 2015
Discount rate
3.42
%
3.80
%
3.77
%
3.93
%
Rate of increase in future compensation levels
3.80
%
3.80
%
3.96
%
4.01
%
Expected long-term rate of return on plan assets
6.24
%
7.66
%
7.74
%
8.10
%

The weighted-average assumptions used to determine net periodic benefit costs for U.S. plans are summarized in the table below:
Weighted- Average Assumptions used to Determine Net Periodic Benefit Cost
Successor
Predecessor
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
For the Year Ended December 31, 2016
For the Year Ended December 31, 2015
Discount rate
3.73
%
4.16
%
4.04
%
4.29
%
Rate of increase in future compensation levels
3.95
%
3.95
%
4.15
%
4.20
%
Expected long-term rate of return on plan assets
6.25
%
8.00
%
8.00
%
8.50
%
Schedule of Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
Pension Plans with Projected Benefit Obligations in Excess of Plan Assets

Successor
Predecessor
(In millions)
December 31, 2017
December 31, 2016
Projected benefit obligations
$
25,254

$
24,779

Accumulated benefit obligations
24,864

24,297

Fair value of plan assets
19,941

16,601
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block]
Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets

Successor
Predecessor
(In millions)
December 31, 2017
December 31, 2016
Projected benefit obligations
$
24,625

$
23,946

Accumulated benefit obligations
24,315

23,591

Fair value of plan assets
19,335

15,838
Schedule of Net Benefit Costs [Table Text Block]
 
 
Defined Benefit Pension Plans
Other Post Employment Benefits
(In millions)
Successor
Predecessor

Successor
Predecessor

Components of net periodic benefit cost (credit) and amounts recognized in other comprehensive loss
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
For the Year Ended December 31, 2016
For the Year Ended December 31, 2015
For the Period September 1 through December 31, 2017
For the Period January 1 through August 31, 2017
For the Year Ended December 31, 2016
For the Year Ended December 31, 2015
Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
Service cost
$
49

$
92

$
174

$
232

$
3

$
6

$
11

$
15

Interest cost
247

524

800

1,084

26

60

87

112

Expected return on plan assets
(407
)
(824
)
(1,320
)
(1,554
)
—

—

—

—

Amortization of unrecognized loss
—

506

822

768

—

61

78

78

Amortization of prior service benefit
—

(3
)
(6
)
(9
)
—

(46
)
(134
)
(182
)
Curtailment loss (gain)
—

—

40

(6
)
—

—

(392
)
(274
)
Settlement loss
—

—

62

76

—

—

—

—

Net periodic (credit) benefit cost - Total
$
(111
)
$
295

$
572

$
591

$
29

$
81

$
(350
)
$
(251
)
Less: Discontinued operations
1

3

—

—

—

—

—

(272
)
Net periodic (credit) benefit cost - Continuing operations
$
(112
)
$
292

$
572

$
591

$
29

$
81

$
(350
)
$
21

Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
 
 
 
 
 
 
 
 
Net (gain) loss
$
(165
)
$
(22
)
$
570

$
57

$
68

$
—

$
153

$
(4
)
Amortization of unrecognized loss
—

(506
)
(822
)
(768
)
—

(61
)
(78
)
(78
)
Prior service benefit
—

—

—

—

—

—

(28
)
—

Amortization of prior service benefit
—

3

6

9

—

46

134

182

Curtailment (loss) gain
—

—

(40
)
6

—

—

392

274

Settlement loss
—

—

(62
)
(76
)
—

—

—

—

Effect of foreign exchange rates
—

133

(138
)
(119
)
—

—

—

1

Spin-off of Chemours
—

—

—

(382
)
—

—

—

—

Total (benefit) loss recognized in other comprehensive loss, attributable to DuPont
$
(165
)
$
(392
)
$
(486
)
$
(1,273
)
$
68

$
(15
)
$
573

$
375

Total recognized in net periodic benefit cost and other comprehensive (income) loss
$
(276
)
$
(97
)
$
86

$
(682
)
$
97

$
66

$
223

$
124
Schedule of Expected Benefit Payments [Table Text Block]
Estimated Future Benefit Payments at December 31, 2017 (Successor)
Defined Benefit Pension Plans
Other Post Employment Benefits
(In millions)
2018
$
1,636

$
250

2019
1,614

243

2020
1,600

236

2021
1,587

227

2022
1,568

218

Years 2023-2027
7,533

906

Total
15,538

2,080
Schedule of Allocation of Plan Assets [Table Text Block]
Target Allocation for Plan Assets
Successor
Predecessor
Asset Category
December 31, 2017
December 31, 2016
U.S. equity securities
17
%
27
%
Non-U.S. equity securities
18

24

Fixed income securities
50

33

Hedge funds
2

2

Private market securities
8

8

Real estate
3

4

Cash and cash equivalents
2

2

Total
100
%
100
%
Basis of Fair Value Measurements
 
 
 
 
For the year ended December 31, 2017 (Successor)
 
 
 
 
(In millions)
Total
Level 1
Level 2
Level 3
Cash and cash equivalents
$
3,057

$
3,057

$
—

$
—

U.S. equity securities 1
4,043

4,012

14

17

Non-U.S. equity securities
3,064

2,866

195

3

Debt – government-issued
3,263

497

2,766

—

Debt – corporate-issued
3,181

270

2,884

27

Debt – asset-backed
706

17

687

2

Hedge funds
85

—

83

2

Private market securities
14

—

—

14

Real estate
342

239

7

96

Derivatives – asset position
24

3

21

—

Derivatives – liability position
(16
)
—

(16
)
—

Other
2

—

2

—

     Subtotal
$
17,765

$
10,961

$
6,643

$
161

Investments measured at net asset value
 
 
 
 
     Hedge funds
747

 
 
 
     Private market securities
1,383

 
 
 
     Real estate funds
437

 
 
 
Total investments measured at net asset value
$
2,567

 
 
 
Other items to reconcile to fair value of plan assets
 
 
 
 
     Pension trust receivables 2
127

 

 

 

     Pension trust payables 3
(175
)
 

 

 

Total
$
20,284

 

 

 

1.
The DuPont pension plans directly held $910 million (4 percent of total plan assets) of DowDuPont common stock at December 31, 2017.
2.
Primarily receivables for investments securities sold.
3.
Primarily payables for investment securities purchased


Basis of Fair Value Measurements
 
 
 
 
For the year ended December 31, 2016 (Predecessor)
 
 
 
 
(In millions)
Total
Level 1
Level 2
Level 3
Cash and cash equivalents
$
1,505

$
1,480

$
25

$
—

U.S. equity securities1
4,071

4,033

20

18

Non-U.S. equity securities
3,278

3,126

151

1

Debt – government-issued
2,067

864

1,203

—

Debt – corporate-issued
2,475

273

2,163

39

Debt – asset-backed
721

39

682

—

Hedge funds
1

—

1

—

Private market securities
67

—

25

42

Real estate
275

175

2

98

Derivatives – asset position
53

7

46

—

Derivatives – liability position
(47
)
—

(47
)
—

Other
4

—

4

—

     Subtotal
$
14,470

$
9,997

$
4,275

$
198

Investments measured at net asset value


 
 
 
     Hedge funds
434

 
 
 
     Private market securities
1,416

 
 
 
     Real estate funds
444

 
 
 
Total investments measured at net asset value
$
2,294

 
 
 
Other items to reconcile to fair value of plan assets


 
 
 
     Pension trust receivables2
264

 

 

 

     Pension trust payables3
(372
)
 

 

 

Total
$
16,656

 

 

 

1.
The DuPont pension plans directly held $732 million (4 percent of total plan assets) of DuPont common stock at December 31, 2016.
2.
Primarily receivables for investments securities sold.
3.
Primarily payables for investment securities purchased.
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block]
Fair Value Measurement of Level 3 Pension Plan Assets
U.S. equity securities
Non-U.S. equity securities
Debt – corporate-issued
Debt-
asset-
backed
Hedge funds
Private market securities
Real estate
Total
(In millions)
Predecessor
 
 
 
 
 
 
 
 
Balance at January 1, 2016
$
20

$
2

$
34

$
1

$
—

$
37

$
144

$
238

Actual return on assets:






 
 


 
 
Relating to assets sold during the year ended December 31, 2016
(3
)
—

(25
)
—

—

—

—

(28
)
Relating to assets held at December 31, 2016
1

(1
)
27

—

—

2

(10
)
19

Purchases, sales and settlements, net
—

—

(3
)
(1
)
—

3

(36
)
(37
)
Transfers in Level 3, net
—

—

6

—

—

—

—

6

Balance at December 31, 2016
$
18

$
1

$
39

$
—

$
—

$
42

$
98

$
198

Actual return on assets:
 
 
 
 
 
 
 
 
Relating to assets sold during the period January 1 through August 31, 2017
(1
)
2

(20
)
—

—

—

—

(19
)
Relating to assets held at August 31, 2017
(7
)
(2
)
22

—

—

(5
)
7

15

Purchases, sales and settlements, net
6

1

(1
)
—

—

1

(7
)
—

Transfers in (out) of Level 3, net
—

—

6

2

—

(21
)
—

(13
)
Balance at August 31, 2017
$
16

$
2

$
46

$
2

$
—

$
17

$
98

$
181

Successor
 
 
 
 
 
 
 
 
Balance at September 1, 2017
$
16

$
2

$
46

$
2

$
—

$
17

$
98

$
181

Actual return on assets:
 
 
 
 
 
 
 
 
Relating to assets sold during the period September 1 through December 31, 2017
—

—

(3
)
—

—

—

—

(3
)
Relating to assets held at December 31, 2017
1

(1
)
5

—

—

(3
)
4

6

Purchases, sales and settlements, net
—

2

(21
)
—

2

—

(6
)
(23
)
Balance at December 31, 2017
$
17

$
3

$
27

$
2

$
2

$
14

$
96

$
161
Schedule of Pension Plans and Other Postemployment Benefits [Table Text Block]
Change in Projected Benefit Obligations, Plan Assets and Funded Status
 
Defined Benefit Pension Plans
Other Post Employment Benefits
 
Successor
Predecessor

Successor
Predecessor

(In millions)
For the Period September 1 through December 31, 2017 1
For the Period January 1 through August 31, 2017
For the Year Ended December 31, 2016
For the Period September 1 through December 31, 2017 1
For the Period January 1 through August 31, 2017
For the Year Ended December 31, 2016
Change in benefit obligations:
 
 
 
 
 
 
Benefit obligation at beginning of the period
$
26,036

$
24,831

$
26,094

$
2,772

$
2,829

$
2,758

Service cost
49

92

174

3

6

11

Interest cost
247

524

800

26

60

87

Plan participants' contributions
6

8

18

12

26

36

Actuarial (gain) loss
(23
)
—

460

68

—

153

Benefits paid2
(730
)
(1,118
)
(2,374
)
(71
)
(192
)
(254
)
Plan amendments
—

—

—

—

—

(28
)
Net effects of acquisitions / divestitures / other
22

—

7

—

—

65

Effect of foreign exchange rates
(57
)
429

(348
)
—

2

1

Benefit obligations at end of the period
$
25,550

$
24,766

$
24,831

$
2,810

$
2,731

$
2,829

 
 
 
 
 
 
 
Change in plan assets:
 
 
 
 
 
 
Fair value of plan assets at beginning of the period
$
20,395

$
16,656

$
17,497

$
—

$
—

$
—

Actual return on plan assets
549

846

1,219

—

—

—

Employer contributions
68

3,024

535

59

166

218

Plan participants' contributions
6

8

18

12

26

36

Benefits paid2
(730
)
(1,118
)
(2,374
)
(71
)
(192
)
(254
)
Net effects of acquisitions / divestitures / other
29

—

—

—

—

—

Effect of foreign exchange rates
(33
)
269

(239
)
—

—

—

Fair value of plan assets at end of the period
$
20,284

$
19,685

$
16,656

$
—

$
—

$
—

Funded status
 
 
 
 
 
 
U.S. plan with plan assets
$
(3,628
)
$
(3,277
)
$
(6,391
)
$
—

$
—

$
—

Non-U.S. plans with plan assets
(447
)
(609
)
(674
)
—

—

—

All other plans 3, 4
(1,191
)
(1,187
)
(1,102
)
(2,810
)
(2,731
)
(2,829
)
Plans of discontinued operations
—

(8
)
(8
)
—

—

—

Funded status at end of the period
$
(5,266
)
$
(5,081
)
$
(8,175
)
$
(2,810
)
$
(2,731
)
$
(2,829
)
1.
The benefit obligation and the fair value of plan assets at the beginning of the period September 1 through December 31, 2017, reflects the remeasurement of the plans at the Merger Effectiveness Time.
2.
In the fourth quarter of 2016, about $550 million of lump-sum payments were made from the principal U.S. pension plan trust fund to a group of separated, vested plan participants who were extended a limited-time opportunity and voluntarily elected to receive their pension benefits in a single lump-sum payment. In the fourth quarter of 2017, about $140 million of lump-sum payments were made from the principal U.S. pension plan trust fund under a similar program.
3.
As of December 31, 2017, $389 million of the benefit obligations are supported by funding under the Trust agreement, defined in the "Trust Assets" section below.
4.
Includes pension plans maintained around the world where funding is not customary.

 
Defined Benefit Pension Plans
Other Post Employment Benefits
(In millions)
Successor
Predecessor
Successor
Predecessor
December 31, 2017
December 31, 2016
December 31, 2017
December 31, 2016
Amounts recognized in the Consolidated Balance Sheets:
 
 
 
 
Other Assets
$
47

$
3

$
—

$
—

Accrued and other current liabilities
(86
)
(78
)
(250
)
(275
)
Liabilities held for sale - current
—

(8
)
—

—

Pension and other post employment benefits - noncurrent 1
(5,227
)
 
(2,560
)
 
Other noncurrent obligations 1
—

(8,092
)
—

(2,554
)
Net amount recognized
$
(5,266
)
$
(8,175
)
$
(2,810
)
$
(2,829
)
 
 
 
 
 
Pretax amounts recognized in accumulated other comprehensive (income) loss:
 
 
 
 
Net (gain) loss
$
(165
)
$
10,280

$
68

$
830

Prior service benefit
—

(17
)
—

(281
)
Pretax balance in accumulated other comprehensive (income) loss at end of year
$
(165
)
$
10,263

$
68

$
549

1.
In the Successor Period, non-current pension and OPEB liabilities are included within pension and other post employment benefits - noncurrent in the Consolidated Balance Sheets.  In the Predecessor period, these liabilities are included within other noncurrent obligations. 
(In millions)
Successor
Predecessor
 
 
December 31, 2017
December 31, 2016
 
 
Fair Value
Unfunded Commitments
Fair Value
Unfunded Commitments
Redemption Frequency
Redemption Notice Period Range
Hedge funds 1
747

—

434

—

Monthly, Quarterly
Ranges from 15-45 days monthly, 10-185 days quarterly
Private market securities 2
1,383

797

1,416

693

Not applicable
Not applicable
Real estate funds 2
437

371

444

244

Not applicable
Not applicable
Total
$
2,567

$
1,168

$
2,294

$
937

 
1.
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.
2.
The remaining life of private market securities and real estate funds is an average of 15 years per investment.