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Pension Plans and Other Post Employment Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
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
December 31, 2018
December 31, 2017
Discount rate
4.23
%
3.56
%

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 Year Ended December 31, 2018
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
Discount rate
3.56
%
3.62
%
4.03
%
3.87
%

Assumed Health Care Cost Trend Rates

December 31, 2018
December 31, 2017
Health care cost trend rate assumed for next year
7.50
%
6.40
%
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
2028

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
December 31, 2018
December 31, 2017
Discount rate
3.94
%
3.37
%
Rate of increase in future compensation levels 1
2.90
%
4.04
%
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 December 31, 2018 rate is only applicable for non-U.S. pension plans since employees who participate in the U.S. pension plans no longer accrue additional benefits for future service and eligible compensation as of November 30, 2018.
  
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 Year Ended December 31, 2018
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
Discount rate
3.38
%
3.42
%
3.80
%
3.77
%
Rate of increase in future compensation levels
4.04
%
3.80
%
3.80
%
3.96
%
Expected long-term rate of return on plan assets
6.19
%
6.24
%
7.66
%
7.74
%

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 Year Ended December 31, 2018
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
Discount rate
3.65
%
3.73
%
4.16
%
4.04
%
Rate of increase in future compensation levels
4.25
%
3.95
%
3.95
%
4.15
%
Expected long-term rate of return on plan assets
6.25
%
6.25
%
8.00
%
8.00
%
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 Year Ended December 31, 2018
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, 2018
For the Period September 1 through December 31, 2017 1
For the Period January 1 through August 31, 2017
Change in benefit obligations:
 
 
 
 
 
 
 
Benefit obligation at beginning of the period
$
25,550

$
26,036

$
24,831

 
$
2,810

$
2,772

$
2,829

Service cost
131

49

92

 
9

3

6

Interest cost
752

247

524

 
85

26

60

Plan participants' contributions
10

6

8

 
38

12

26

Actuarial (gain) loss
(1,078
)
(23
)
—

 
(172
)
68

—

Benefits paid2
(1,747
)
(730
)
(1,118
)
 
(254
)
(71
)
(192
)
Plan amendments
17

—

—

 
—

—

—

Net effects of acquisitions / divestitures / other
(12
)
22

—

 
—

—

—

Effect of foreign exchange rates
(209
)
(57
)
429

 
(2
)
—

2

Benefit obligations at end of the period
$
23,414

$
25,550

$
24,766

 
$
2,514

$
2,810

$
2,731

 
 
 
 
 
 
 
 
Change in plan assets:
 
 
 
 
 
 
 
Fair value of plan assets at beginning of the period
$
20,284

$
20,395

$
16,656

 
$
—

$
—

$
—

Actual return on plan assets
(782
)
549

846

 
—

—

—

Employer contributions
1,308

68

3,024

 
216

59

166

Plan participants' contributions
10

6

8

 
38

12

26

Benefits paid2
(1,747
)
(730
)
(1,118
)
 
(254
)
(71
)
(192
)
Net effects of acquisitions / divestitures / other
(7
)
29

—

 
—

—

—

Effect of foreign exchange rates
(148
)
(33
)
269

 
—

—

—

Fair value of plan assets at end of the period
$
18,918

$
20,284

$
19,685

 
$
—

$
—

$
—

Funded status
 
 
 
 
 
 
 
U.S. plan with plan assets
$
(2,890
)
$
(3,628
)
$
(3,277
)
 
$
—

$
—

$
—

Non-U.S. plans with plan assets
(488
)
(447
)
(609
)
 
—

—

—

All other plans 3, 4
(1,118
)
(1,191
)
(1,187
)
 
(2,514
)
(2,810
)
(2,731
)
Plans of discontinued operations
—

—

(8
)
 
—

—

—

Funded status at end of the period
$
(4,496
)
$
(5,266
)
$
(5,081
)
 
$
(2,514
)
$
(2,810
)
$
(2,731
)
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 2017, about $140 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.
3.
As of December 31, 2018, and December 31, 2017, $349 million and $389 million respectively 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)
December 31, 2018
December 31, 2017
December 31, 2018
December 31, 2017
Amounts recognized in the Consolidated Balance Sheets:
 
 
 
 
Other Assets
$
11

$
47

$
—

$
—

Accrued and other current liabilities
(95
)
(86
)
(243
)
(250
)
Pension and other post employment benefits - noncurrent
(4,412
)
(5,227
)
(2,271
)
(2,560
)
Net amount recognized
$
(4,496
)
$
(5,266
)
$
(2,514
)
$
(2,810
)
 
 
 
 
 
Pretax amounts recognized in accumulated other comprehensive loss (income):
 
 
 
 
Net loss (gain)
$
737

$
(165
)
$
(104
)
$
68

Prior service cost
17

—

—

—

Pretax balance in accumulated other comprehensive loss (income) at end of year
$
754

$
(165
)
$
(104
)
$
68
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
December 31, 2018
December 31, 2017
(In millions)
Projected benefit obligations
$
23,143

$
25,254

Fair value of plan assets
18,636

19,941
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
December 31, 2018
December 31, 2017
(In millions)
Accumulated benefit obligations
$
22,185

$
24,315

Fair value of plan assets
17,901

19,335
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 Year Ended December 31, 2018
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, 2018
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
Net Periodic Benefit Cost:
 
 
 
 
 
 
 
 
 
Service cost
$
131

$
49

$
92

$
174

 
$
9

$
3

$
6

$
11

Interest cost
752

247

524

800

 
85

26

60

87

Expected return on plan assets
(1,202
)
(407
)
(824
)
(1,320
)
 
—

—

—

—

Amortization of unrecognized loss
7

—

506

822

 
—

—

61

78

Amortization of prior service benefit
—

—

(3
)
(6
)
 
—

—

(46
)
(134
)
Curtailment (gain) loss
(11
)
—

—

40

 
—

—

—

(392
)
Settlement loss
1

—

—

62

 
—

—

—

—

Net periodic (credit) benefit cost - Total
$
(322
)
$
(111
)
$
295

$
572

 
$
94

$
29

$
81

$
(350
)
Less: Discontinued operations
—

1

3

—

 
—

—

—

—

Net periodic (credit) benefit cost - Continuing operations
$
(322
)
$
(112
)
$
292

$
572

 
$
94

$
29

$
81

$
(350
)
Changes in plan assets and benefit obligations recognized in other comprehensive (income) loss:
 
 
 
 
 
 
 
 
 
Net loss (gain)
$
906

$
(165
)
$
(22
)
$
570

 
$
(172
)
$
68

$
—

$
153

Amortization of unrecognized loss
(7
)
—

(506
)
(822
)
 
—

—

(61
)
(78
)
Prior service cost (benefit)
17

—

—

—

 
—

—

—

(28
)
Amortization of prior service benefit
—

—

3

6

 
—

—

46

134

Curtailment (loss) gain
—

—

—

(40
)
 
—

—

—

392

Settlement gain (loss)
2

—

—

(62
)
 
—

—

—

—

Effect of foreign exchange rates
1

—

133

(138
)
 
—

—

—

—

Total loss (benefit) recognized in other comprehensive loss, attributable to Historical DuPont
$
919

$
(165
)
$
(392
)
$
(486
)
 
$
(172
)
$
68

$
(15
)
$
573

Total recognized in net periodic benefit cost and other comprehensive loss (income)
$
597

$
(276
)
$
(97
)
$
86

 
$
(78
)
$
97

$
66

$
223
Schedule of Expected Benefit Payments [Table Text Block]
Estimated Future Benefit Payments at December 31, 2018
Defined Benefit Pension Plans
Other Post Employment Benefits
(In millions)
2019
$
1,648

$
240

2020
1,613

235

2021
1,597

226

2022
1,574

219

2023
1,556

210

Years 2024-2028
7,437

861

Total
$
15,425

$
1,991
Schedule of Allocation of Plan Assets [Table Text Block]
Target Allocation for Plan Assets
December 31, 2018
December 31, 2017
Asset Category
U.S. equity securities
19
%
17
%
Non-U.S. equity securities
16

18

Fixed income securities
50

50

Hedge funds
2

2

Private market securities
8

8

Real estate
3

3

Cash and cash equivalents
2

2

Total
100
%
100
%
Basis of Fair Value Measurements
 
 
 
 
For the year ended December 31, 2018
 
 
 
 
(In millions)
Total
Level 1
Level 2
Level 3
Cash and cash equivalents
$
1,824

$
1,824

$
—

$
—

U.S. equity securities 1
3,537

3,521

2

14

Non-U.S. equity securities
2,582

2,565

15

2

Debt – government-issued
3,659

211

3,448

—

Debt – corporate-issued
3,037

253

2,770

14

Debt – asset-backed
721

39

682

—

Hedge funds
162

162

—

—

Private market securities
1

—

—

1

Real estate
336

243

—

93

Derivatives – asset position
10

1

9

—

Derivatives – liability position
(18
)
—

(18
)
—

Other
206

—

—

206

     Subtotal
$
16,057

$
8,819

$
6,908

$
330

Investments measured at net asset value
 
 
 
 
     Debt - government issued
208

 
 
 
     Hedge funds
678

 
 
 
     Private market securities
1,861

 
 
 
     Real estate funds
112

 
 
 
Total investments measured at net asset value
$
2,859

 
 
 
Other items to reconcile to fair value of plan assets
 
 
 
 
     Pension trust receivables 2
210

 

 

 

     Pension trust payables 3
(208
)
 

 

 

Total
$
18,918

 

 

 

1.
The Historical DuPont pension plans directly held $684 million (4 percent of total plan assets) of DowDuPont common stock at December 31, 2018.
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, 2017
 
 
 
 
(In millions)
Total
Level 1
Level 2
Level 3
Cash and cash equivalents
$
3,057

$
3,057

$
—

$
—

U.S. equity securities1
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 receivables2
127

 

 

 

     Pension trust payables3
(175
)
 

 

 

Total
$
20,284

 

 

 

1.
The Historical 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
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
Other
Total
(In millions)
Predecessor
 
 
 
 
 
 
 
 
 
Balance at January 1, 2017
$
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

Actual return on assets:














 
 
Relating to assets sold during the year ended December 31, 2018
(1
)
(4
)
(80
)
—

—

—

2

—

(83
)
Relating to assets held at December 31, 2018
(4
)
3

87

—

—

(3
)
—

(11
)
72

Purchases, sales and settlements, net
3

—

(15
)
—

—

—

(3
)
217

202

Transfers out of Level 3, net
(1
)
—

(5
)
(2
)
(2
)
(10
)
(2
)
—

(22
)
Balance at December 31, 2018
$
14

$
2

$
14

$
—

$
—

$
1

$
93

$
206

$
330