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Stockholders' Equity Stockholders' Equity (Narrative) (Details) - USD ($) $ in Millions |  | 8 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 30, 2017 | Aug. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2014
Predecessor [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Shares | 87,041,000 | 0 | 87,041,000 | 87,041,000 |  | 87,041,000
Excess of Cost of Treasury Stock over Par Value |  | $ 0 | $ 0 | $ 0 |  |
Tax benefit (expense) recorded in Stockholders' Equity |  |  | 33 | (138) |  |
Tax benefits |  |  | 21 | 37 |  |
Successor [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Treasury Stock, Shares |  | 0 |  |  | 0 |
Retained Earnings [Member] | Predecessor [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Excess of Cost of Treasury Stock over Par Value | $ 5,657 | $ 5,657 | 758 | 1,890 |  |
Additional Paid-in Capital [Member] | Predecessor [Member] |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Excess of Cost of Treasury Stock over Par Value | $ 1,044 | $ 1,044 | $ 154 | $ 451 |  |

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