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Significant Accounting Policies - Adoption of ASC 842 on Unaudited Condensed Consolidated Balance Sheet (Parenthetical) (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jan. 01, 2019 | Dec. 31, 2019 | Dec. 31, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Recorded a net increase in opening retained earnings |  | $ 3 | $ 4
Accounting Standards Update 2016-02 | Adjustments Due to ASC 842 |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Recorded a net increase in opening retained earnings | $ 3 |  |

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- Definition Amount of the cumulative effect on retained earnings net of related income tax effect. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 250 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=109234566&loc=d3e22663-107794 + Details
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