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Summary of Common Shares (Detail) - shares | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Class of Stock [Line Items] |  |
Authorized | 1,100,000,000 | 1,100,000,000
Common shares outstanding | 743,902,000 | 782,565,000

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- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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