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v3.19.3.a.u2

Revenue Recognition - Additional Information (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 Segment | Dec. 31, 2019 USD ($) Segment | Dec. 31, 2018 USD ($) | Jan. 01, 2019 USD ($) | Jan. 01, 2018 USD ($)
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Customer invoices due period |  | 30 days |  |  |
Number of reportable segment | Segment | 2 | 2 |  |  |
Deferred revenue |  | $ 62 | $ 63 | $ 63 | $ 59
Revenue recognized |  | 61 | 57 |  |
Contract with customer revenue refunded due to cancellations |  | 2 | 2 |  |
Selling and Marketing |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Amortization expense |  | $ 1 |  |  |
Maximum |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Capitalized contract cost, Amortization period |  | 1 year |  |  |
Sales Incentive Program | Minimum |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Capitalized contract cost, Amortization period |  | 1 year |  |  |
ASC 606 |  |  |  |  |
Disaggregation Of Revenue [Line Items] |  |  |  |  |
Customer invoices due period |  | 30 days |  |  |
Capitalized costs to obtain a contract |  | $ 4 | $ 2 |  |

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