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Restructuring and Asset Related Charges 2017 Restructuring Program (Details) - USD ($) $ in Millions | 2 Months Ended | 8 Months Ended |
--- | --- | --- | ---
Aug. 31, 2017 | Aug. 31, 2017 | Sep. 30, 2018
2017 Restructuring Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring Reserve |  |  | $ 7
Predecessor [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Asset Related Charges - Net | $ 11 | $ 323 |
Predecessor [Member] | 2017 Restructuring Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Asset Related Charges - Net |  | 313 |
Predecessor [Member] | Asset Related Charges [Member] | 2017 Restructuring Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Asset Related Charges - Net |  | 279 |
Predecessor [Member] | Employee Severance [Member] | 2017 Restructuring Program [Member] |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring and Asset Related Charges - Net | $ 1 | $ 34 |

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- Definition Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747 + Details
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- Definition Amount of restructuring charges, remediation cost, and asset impairment loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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