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Stockholders' Equity Narrative) (Details) - USD ($) $ in Millions |  | 8 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2017 | Aug. 31, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Treasury Stock, Shares | 87,000,000 | 87,000,000 |  |
Predecessor |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Excess of cost of treasury stock over par value |  | $ 0 | $ 3 |
Treasury Stock, Shares |  |  |  | 87,041,000
Retained Earnings [Member] | Predecessor |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Excess of cost of treasury stock over par value | $ 5,657 |  |  |
Additional Paid-in Capital [Member] | Predecessor |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |
Excess of cost of treasury stock over par value | $ 1,044 |  |  |

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