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Pension Plans and Other Post Employment Benefit Plans Summary of Fair Value Measurement of Level 3 Pension Plan Assets (Details) - Pension Plan - USD ($) $ in Millions | 4 Months Ended | 8 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Predecessor [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | $ 19,685 |  | $ 16,656 | $ 17,497
Predecessor [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 181 |  | 198 | 238
Actual Return (Loss) on Plan Assets Sold |  |  | (19) |  | (28) |
Actual Return (Loss) on Plan Assets Still Held |  |  | 15 |  | 19 |
Purchases, Sales, and Settlements |  |  | 0 |  | (37) |
Assets Transferred into (out of) Level 3 |  |  | (13) |  | 6 |
Predecessor [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 2,475 |
Predecessor [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 46 |  | 39 | 34
Actual Return (Loss) on Plan Assets Sold |  |  | (20) |  | (25) |
Actual Return (Loss) on Plan Assets Still Held |  |  | 22 |  | 27 |
Purchases, Sales, and Settlements |  |  | (1) |  | (3) |
Assets Transferred into (out of) Level 3 |  |  | 6 |  | 6 |
Predecessor [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 721 |
Predecessor [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 2 |  | 0 | 1
Actual Return (Loss) on Plan Assets Sold |  |  | 0 |  | 0 |
Actual Return (Loss) on Plan Assets Still Held |  |  | 0 |  | 0 |
Purchases, Sales, and Settlements |  |  | 0 |  | (1) |
Assets Transferred into (out of) Level 3 |  |  | 2 |  | 0 |
Predecessor [Member] | Hedge Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 1 |
Predecessor [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 0 |  | 0 | 0
Actual Return (Loss) on Plan Assets Sold |  |  | 0 |  | 0 |
Actual Return (Loss) on Plan Assets Still Held |  |  | 0 |  | 0 |
Purchases, Sales, and Settlements |  |  | 0 |  | 0 |
Assets Transferred into (out of) Level 3 |  |  | 0 |  | 0 |
Predecessor [Member] | Private Market Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 67 |
Predecessor [Member] | Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 17 |  | 42 | 37
Actual Return (Loss) on Plan Assets Sold |  |  | 0 |  | 0 |
Actual Return (Loss) on Plan Assets Still Held |  |  | (5) |  | 2 |
Purchases, Sales, and Settlements |  |  | 1 |  | 3 |
Assets Transferred into (out of) Level 3 |  |  | (21) |  | 0 |
Predecessor [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 275 |
Predecessor [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 98 |  | 98 | 144
Actual Return (Loss) on Plan Assets Sold |  |  | 0 |  | 0 |
Actual Return (Loss) on Plan Assets Still Held |  |  | 7 |  | (10) |
Purchases, Sales, and Settlements |  |  | (7) |  | (36) |
Assets Transferred into (out of) Level 3 |  |  | 0 |  | 0 |
Successor [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | $ 20,284 | 20,395 | [1] |  |
Successor [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 161 | 181 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | (3) |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | 6 |  |  |  |
Purchases, Sales, and Settlements |  | (23) |  |  |  |
Successor [Member] | Corporate Debt Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,181 |  |  |  |
Successor [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 27 | 46 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | (3) |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | 5 |  |  |  |
Purchases, Sales, and Settlements |  | (21) |  |  |  |
Successor [Member] | Asset-backed Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 706 |  |  |  |
Successor [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2 | 2 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | 0 |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | 0 |  |  |  |
Purchases, Sales, and Settlements |  | 0 |  |  |  |
Successor [Member] | Hedge Funds [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 85 |  |  |  |
Successor [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 2 | 0 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | 0 |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | 0 |  |  |  |
Purchases, Sales, and Settlements |  | 2 |  |  |  |
Successor [Member] | Private Market Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 14 |  |  |  |
Successor [Member] | Private Market Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 14 | 17 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | 0 |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | (3) |  |  |  |
Purchases, Sales, and Settlements |  | 0 |  |  |  |
Successor [Member] | Real Estate [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 342 |  |  |  |
Successor [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 96 | 98 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | 0 |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | 4 |  |  |  |
Purchases, Sales, and Settlements |  | (6) |  |  |  |
UNITED STATES | Predecessor [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [2] |  |  |  | 4,071 |
UNITED STATES | Predecessor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 16 |  | 18 | 20
Actual Return (Loss) on Plan Assets Sold |  |  | (1) |  | (3) |
Actual Return (Loss) on Plan Assets Still Held |  |  | (7) |  | 1 |
Purchases, Sales, and Settlements |  |  | 6 |  | 0 |
Assets Transferred into (out of) Level 3 |  |  | 0 |  | 0 |
UNITED STATES | Successor [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets | [3] | 4,043 |  |  |  |
UNITED STATES | Successor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 17 | 16 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | 0 |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | 1 |  |  |  |
Purchases, Sales, and Settlements |  | 0 |  |  |  |
Non-US [Member] | Predecessor [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  |  |  | 3,278 |
Non-US [Member] | Predecessor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  |  | 2 |  | 1 | $ 2
Actual Return (Loss) on Plan Assets Sold |  |  | 2 |  | 0 |
Actual Return (Loss) on Plan Assets Still Held |  |  | (2) |  | (1) |
Purchases, Sales, and Settlements |  |  | 1 |  | 0 |
Assets Transferred into (out of) Level 3 |  |  | 0 |  | $ 0 |
Non-US [Member] | Successor [Member] | Equity Securities [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3,064 |  |  |  |
Non-US [Member] | Successor [Member] | Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Fair value of plan assets |  | 3 | $ 2 |  |  |
Actual Return (Loss) on Plan Assets Sold |  | 0 |  |  |  |
Actual Return (Loss) on Plan Assets Still Held |  | (1) |  |  |  |
Purchases, Sales, and Settlements |  | $ 2 |  |  |  |
[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] | The DuPont pension plans directly held $732 million (4 percent of total plan assets) of DuPont common stock at December 31, 2016.
[3] | The DuPont pension plans directly held $910 million (4 percent of total plan assets) of DowDuPont common stock at December 31, 2017.

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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets sold. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(02)(A) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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