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Summary of Significant Accounting Policies - Stock Split (Details) $ in Millions |  | 12 Months Ended
--- | --- | ---
Feb. 21, 2018 | Dec. 31, 2020 USD ($)
Class of Stock [Line Items] |  |
Stock split ratio | 2 |
Common Stock |  |
Class of Stock [Line Items] |  |
(Increase)/Decrease adjustments due stock split, APIC |  | $ (4)
Additional Paid-In Capital |  |
Class of Stock [Line Items] |  |
(Increase)/Decrease adjustments due stock split, APIC |  | $ 4

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