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Financial Risks - Summary of Closing Levels of Certain Major Indices (Detail) Unit_pure in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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S & P 500 [member] |  |  |  |  |
Disclosure of equities prices [line items] |  |  |  |  |
Closing levels of major indices | 3,231 | 2,507 | 2,674 | 2,239 | 2,044
Nasdaq [member] |  |  |  |  |
Disclosure of equities prices [line items] |  |  |  |  |
Closing levels of major indices | 8,973 | 6,635 | 6,903 | 5,383 | 5,007
FTSE 100 [member] |  |  |  |  |
Disclosure of equities prices [line items] |  |  |  |  |
Closing levels of major indices | 7,542 | 6,728 | 7,688 | 7,143 | 6,242
AEX [member] |  |  |  |  |
Disclosure of equities prices [line items] |  |  |  |  |
Closing levels of major indices | 605 | 488 | 545 | 483 | 442

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