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Summary of Significant Accounting Policies - Stock Split (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 21, 2018 | Mar. 31, 2018 | Dec. 31, 2018 USD ($)
Class of Stock [Line Items] |  |  |
Stock split ratio | 2 | 2 |
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Adjustments due stock split, APIC |  |  | $ 4
Additional Paid-In Capital |  |  |
Class of Stock [Line Items] |  |  |
Adjustments due stock split, APIC |  |  | $ (4)

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