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Shareholders' Equity - Summary of Revaluation Reserve for Available-for-sale Investments (Detail) - shares shares in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of revaluation reserve [Line Items] |  |  |
Revaluation reserve for available-for-sale investments | 4,348 | 1,910 | 3,427
Equity securities [member] |  |  |
Disclosure of revaluation reserve [Line Items] |  |  |
Revaluation reserve for available-for-sale investments | 25 | 22 | 40
Debt securities [member] |  |  |
Disclosure of revaluation reserve [Line Items] |  |  |
Revaluation reserve for available-for-sale investments | 4,348 | 1,911 | 3,401
Other securities [member] |  |  |
Disclosure of revaluation reserve [Line Items] |  |  |
Revaluation reserve for available-for-sale investments | (26) | (23) | (14)

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