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Nature of Business and Basis of Presentation (Details) $ / shares in Units, $ in Millions | Oct. 10, 2018 $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Oct. 09, 2018 $ / shares shares
--- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reverse stock split ratio | 0.0833 |  |
Shares outstanding (in shares) | shares | 90,811,562 |  | 1,089,738,735
Shares authorized (shares) | shares | 300,000,000 | 300,000,000 | 3,500,000,000
Par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.01 | $ 0.00001
Minimum | ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Lease liabilities |  | $ 120 |
ROU asset |  | 120 |
Maximum | ASU 2016-02 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Lease liabilities |  | 135 |
ROU asset |  | $ 135 |

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