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Goodwill and Intangible Assets - Summary of Carrying Amounts of Goodwill and Intangible Assets (Parenthetical) (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | $ 4,215 | $ 4,232 | $ 4,233
Distribution networks [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | 806 | 801 | 868
Customer relationships [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | 738 | 795 | 860
Software [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | 1,059 | 991 | 821
Other [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | 52 | 61 | 67
Fund management contracts and other [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | 796 | 805 | $ 798
US wealth and asset management [member] | Fund management contracts and other [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | 273 | 273 |
Canada wealth and asset management [member] | Fund management contracts and other [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Intangible assets ending balance | 373 | 380 |
Gross Carrying Value [Member] | Distribution networks [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Gross carrying amount of finite life intangible assets | 1,332 | 1,292 |
Gross Carrying Value [Member] | Customer relationships [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Gross carrying amount of finite life intangible assets | 1,130 | 1,133 |
Gross Carrying Value [Member] | Software [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Gross carrying amount of finite life intangible assets | 2,310 | 2,239 |
Gross Carrying Value [Member] | Other [Member] |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [Line Items] |  |  |
Gross carrying amount of finite life intangible assets | $ 123 | $ 130 |

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- Definition The amount of intangible assets that are material to the entity’s financial statements. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 122 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_122_b&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2020-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=38&code=ifrs-tx-2020-en-r&anchor=para_118_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_54_c&doctype=Standard -URIDate 2020-01-01 + Details
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