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Stockholders' Equity (Reclassifications out of accumulated other Comprehensive Income / (Loss)) (Details) (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 8 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 30, 2017 | Aug. 31, 2017 | Sep. 30, 2016 | Aug. 31, 2017 | Sep. 30, 2016
Predecessor |  |  |  |  |  |
Cost of goods sold |  |  | $ 1,975 | $ 2,997 | $ 10,205 | $ 10,923
Income Tax Expense (Benefit) |  |  | (132) | (85) | 149 | 559
Income from continuing operations after income taxes |  |  | (258) | (66) | 1,642 | 1,915
Sundry Income (Expense) - Net |  |  | (112) | (15) | 166 | 407
Successor |  |  |  |  |  |
Cost of goods sold |  | $ 1,511 |  |  |  |
Income Tax Expense (Benefit) |  | (23) |  |  |  |
Income from continuing operations after income taxes |  | (275) |  |  |  |
Sundry Income (Expense) - Net |  | 88 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Predecessor |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax |  |  | 84 | 157 | 321 | 441
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Derivative Instruments |  |  |  |  |  |
Cost of goods sold | [1] |  | 0 | 0 | (21) | 18
Income Tax Expense (Benefit) | [2] |  | 0 | 0 | 8 | (7)
Income from continuing operations after income taxes |  |  | 0 | 0 | (13) | 11
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Net realized gains (losses) on investments, before tax |  |  |  |  |  |
Income Tax Expense (Benefit) | [2] |  | 0 | 0 | 0 | 0
Income from continuing operations after income taxes |  |  | 0 | 6 | (1) | 19
Sundry Income (Expense) - Net | [3] |  | 0 | 6 | (1) | 19
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Pension Plan | Prior service benefit |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  | (1) | (2) | (3) | (5)
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Pension Plan | Actuarial losses |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  | 127 | 229 | 506 | 605
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Pension Plan | Curtailment loss (gain) |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  | 0 | (1) | 0 | 65
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Pension Plan | Settlement loss |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  | 0 | 22 | 0 | 60
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Pension Plan | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 126 | 248 | 503 | 725
Reclassification from AOCI, Current Period, Tax | [2] |  | (45) | (88) | (178) | (256)
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax |  |  | 81 | 160 | 325 | 469
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Other Post Employment Benefit Plans | Prior service benefit |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  | (11) | (36) | (46) | (111)
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Other Post Employment Benefit Plans | Actuarial losses |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  | 15 | 21 | 61 | 56
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Other Post Employment Benefit Plans | Curtailment loss (gain) |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] |  | 0 | 0 | 0 | (33)
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Other Post Employment Benefit Plans | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 4 | (15) | 15 | (88)
Reclassification from AOCI, Current Period, Tax | [2] |  | (1) | 6 | (5) | 30
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax |  |  | $ 3 | $ (9) | $ 10 | $ (58)
Reclassification out of Accumulated Other Comprehensive Income | Successor |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax |  | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Derivative Instruments |  |  |  |  |  |
Cost of goods sold | [1] | 0 |  |  |  |
Income Tax Expense (Benefit) | [2] | 0 |  |  |  |
Income from continuing operations after income taxes |  | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Net realized gains (losses) on investments, before tax |  |  |  |  |  |
Income Tax Expense (Benefit) | [2] | 0 |  |  |  |
Income from continuing operations after income taxes |  | 0 |  |  |  |
Sundry Income (Expense) - Net | [3] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Pension Plan | Prior service benefit |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Pension Plan | Actuarial losses |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Pension Plan | Curtailment loss (gain) |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Pension Plan | Settlement loss |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Pension Plan | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 0 |  |  |  |
Reclassification from AOCI, Current Period, Tax | [2] | 0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax |  | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Other Post Employment Benefit Plans | Prior service benefit |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Other Post Employment Benefit Plans | Actuarial losses |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Other Post Employment Benefit Plans | Curtailment loss (gain) |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | [4] | 0 |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Successor | Other Post Employment Benefit Plans | Accumulated Defined Benefit Plans Adjustment Attributable to Parent |  |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  | 0 |  |  |  |
Reclassification from AOCI, Current Period, Tax | [2] | 0 |  |  |  |
Reclassification from Accumulated Other Comprehensive Income (Loss), Current Period, Net of Tax |  | $ 0 |  |  |  |
[1] | Cost of goods sold.
[2] | Provision for income taxes from continuing operations.
[3] | Sundry income (expense) - net.
[4] | 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 15 for additional information.

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