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Shareholders Capital - Additional Information (Detail) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jan. 31, 2020 | Dec. 31, 2019
Disclosure Of Classes Of Share Capital [Line Items] |  |
Number of share purchase and cancel |  | 16,000,000
Percentage of share purchase and cancel |  | 10.00%
Purchase and cancel of shares |  | $ 26
Events After Reporting Period [Member] |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |
Number of share purchase and cancel | 3,000,000 |
Purchase and cancel of shares | $ 5 |
Top of Range [Member] |  |
Disclosure Of Classes Of Share Capital [Line Items] |  |
Number of share purchase and cancel |  | 29,170,887

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