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Stockholders' Equity (Schedule of tax benefit (expense) on net activity) (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
Successor |  |  |  |  |
Other Comprehensive Income (Loss), Tax | $ 0 |  |  |  |
Successor | Pension Plan |  |  |  |  |
Other Comprehensive Income (Loss), Tax | 0 |  |  |  |
Successor | Other Post Employment Benefit Plans |  |  |  |  |
Other Comprehensive Income (Loss), Tax | 0 |  |  |  |
Successor | Derivative Instruments |  |  |  |  |
Other Comprehensive Income (Loss), Tax | $ 0 |  |  |  |
Predecessor |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  | $ (32) | $ (33) | $ (144) | $ 773
Predecessor | Pension Plan |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  | (31) | (40) | (145) | 668
Predecessor | Other Post Employment Benefit Plans |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  | (1) | 6 | (5) | 125
Predecessor | Derivative Instruments |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  | $ 0 | $ 1 | $ 6 | $ (20)

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=66004124&loc=d3e640-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65896914&loc=d3e39076-109324 + Details
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