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Stockholders' Equity Reclassifications out of AOCI (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 | [1] | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods Sold |  | $ 1,511 |  | $ 4,654 |  |  |  |  |  |  | $ 6,165 |  |  |
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  | (2,673) |  |  |
Income from continuing operations after income taxes |  |  |  |  |  |  |  |  |  |  | 1,087 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Successor [Member] | Derivative Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods Sold | [2] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Income Tax Expense (Benefit) | [3] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Income from continuing operations after income taxes |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Successor [Member] | Unrealized gain (loss) on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reclassification from AOCI, Current Period, Tax | [3] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods Sold |  |  | $ 1,975 |  | $ 4,021 | $ 4,209 | $ 3,032 | $ 2,997 | $ 3,823 | $ 4,103 |  | $ 10,205 | $ 13,955 | $ 14,591
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  |  | 149 | 641 | 575
Income from continuing operations after income taxes |  |  |  |  |  |  |  |  |  |  |  | 1,642 | 2,082 | 1,447
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | 321 | 335 | 297
Predecessor [Member] | Derivative Instruments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost of Goods Sold | [2] |  |  |  |  |  |  |  |  |  |  | (21) | 18 | 12
Income Tax Expense (Benefit) | [3] |  |  |  |  |  |  |  |  |  |  | 8 | (7) | (5)
Income from continuing operations after income taxes |  |  |  |  |  |  |  |  |  |  |  | (13) | 11 | 7
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | (13) | 11 | 7
Predecessor [Member] | Unrealized gain (loss) on investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  |  |  |  |  |  |  |  |  |  | (1) | 28 | (2)
Reclassification from AOCI, Current Period, Tax | [3] |  |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | (1) | 28 | (2)
Pension Plan | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Pension Plan | Successor [Member] | Prior Service Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Pension Plan | Successor [Member] | Actuarial Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Pension Plan | Successor [Member] | Curtailment (loss) gain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Pension Plan | Successor [Member] | Settlement loss |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Pension Plan | Successor [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reclassification from AOCI, Current Period, Tax | [3] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Pension Plan | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | 325 | 594 | 535
Pension Plan | Predecessor [Member] | Prior Service Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  |  | (3) | (6) | (9)
Pension Plan | Predecessor [Member] | Actuarial Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  |  | 506 | 822 | 768
Pension Plan | Predecessor [Member] | Curtailment (loss) gain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  |  | 0 | 40 | (6)
Pension Plan | Predecessor [Member] | Settlement loss |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  |  | 0 | 62 | 76
Pension Plan | Predecessor [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  |  |  |  |  |  |  |  |  |  | 503 | 918 | 829
Reclassification from AOCI, Current Period, Tax | [3] |  |  |  |  |  |  |  |  |  |  | (178) | (324) | (294)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | 325 | 594 | 535
Other Benefit Plans | Successor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other Benefit Plans | Successor [Member] | Prior Service Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other Benefit Plans | Successor [Member] | Actuarial Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other Benefit Plans | Successor [Member] | Curtailment (loss) gain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Other Benefit Plans | Successor [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reclassification from AOCI, Current Period, Tax | [3] |  |  |  |  |  |  |  |  |  | 0 |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |
Other Benefit Plans | Predecessor [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | 10 | (298) | (243)
Other Benefit Plans | Predecessor [Member] | Prior Service Benefit |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  |  | (46) | (134) | (182)
Other Benefit Plans | Predecessor [Member] | Actuarial Losses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  |  | 61 | 78 | 78
Other Benefit Plans | Predecessor [Member] | Curtailment (loss) gain |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [5] |  |  |  |  |  |  |  |  |  |  | 0 | (392) | (274)
Other Benefit Plans | Predecessor [Member] | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  |  |  |  |  |  |  |  |  |  | 15 | (448) | (378)
Reclassification from AOCI, Current Period, Tax | [3] |  |  |  |  |  |  |  |  |  |  | (5) | 150 | 135
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax |  |  |  |  |  |  |  |  |  |  |  | $ 10 | $ (298) | $ (243)
[1] | Includes charges of $(360) million and $(1,109) million during the period September 1 - September 30, 2017 and the fourth quarter 2017, respectively, related to the amortization of inventory step-up as a result of the Merger and the acquisition of the H&N Business, which was included in cost of goods sold. See Note 3 for additional information.
[2] | Cost of goods sold.
[3] | Provision for income taxes from continuing operations.
[4] | Sundry income - net.
[5] | These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost of the company's pension and other benefit plans. See Note 16 for additional information.

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