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Restructuring and Asset Related Charges 2017 Restructuring Program (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2017 | [1] | Aug. 31, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | [1] | Mar. 31, 2017 | [1] | Dec. 31, 2016 | [1] | Sep. 30, 2016 | [1] | Jun. 30, 2016 | [1] | Mar. 31, 2016 | [1] | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  | $ 11 | [1] |  |  | $ 160 | $ 152 | $ 394 | $ 172 | $ (88) | $ 78 |  | $ 323 | $ 556 | $ 795
Predecessor [Member] | 2017 Restructuring Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  |  | 313 |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  | (8) |  |
Asset write-offs |  |  |  |  |  |  |  |  |  |  |  |  |  | (279) |  |
Restructuring Reserve |  |  | 26 |  |  |  |  |  |  |  |  |  |  | 26 |  |
Predecessor [Member] | Employee Severance [Member] | 2017 Restructuring Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  |  | 34 |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  | (8) |  |
Asset write-offs |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Restructuring Reserve |  |  | 26 |  |  |  |  |  |  |  |  |  |  | 26 |  |
Predecessor [Member] | Asset Related Charges [Member] | 2017 Restructuring Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net | [2] |  |  |  |  |  |  |  |  |  |  |  |  | 279 |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |
Asset write-offs | [2] |  |  |  |  |  |  |  |  |  |  |  |  | (279) |  |
Restructuring Reserve |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  | $ 40 |  |  | $ 140 | [1] |  |  |  |  |  |  | $ 180 |  |  |
Successor [Member] | 2017 Restructuring Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |
Restructuring Reserve |  |  |  |  | 19 |  |  |  |  |  |  |  | 19 |  |  |
Successor [Member] | Employee Severance [Member] | 2017 Restructuring Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  | (7) |  |  |
Restructuring Reserve |  |  |  |  | 19 |  |  |  |  |  |  |  | 19 |  |  |
Successor [Member] | Asset Related Charges [Member] | 2017 Restructuring Program [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restructuring and Asset Related Charges - Net |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Payments for Restructuring |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Restructuring Reserve |  |  |  |  | $ 0 |  |  |  |  |  |  |  | $ 0 |  |  |
[1] | See Note 5 for additional information.
[2] | Includes accelerated depreciation related to site closure. Charge for accelerated depreciation represents the difference between the depreciation expense to be recognized over the revised useful life of the site, based upon the anticipated date the site will be closed and depreciation expense as determined utilizing the useful life prior to the restructuring action.

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