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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | $ 3,288 | $ 3,080
Recognized in Income Statement | (930) | 331
Recognized in Other Comprehensive Income | 148 | (320)
Recognized in Equity | 7 | 2
Translation and Other | (9) | 195
Ending balance | 2,504 | 3,288
Loss carry forwards [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 596 | 942
Recognized in Income Statement | 387 | (311)
Recognized in Equity | 7 | 3
Translation and Other | 29 | (38)
Ending balance | 1,019 | 596
Actuarial liabilities [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 7,878 | 9,366
Recognized in Income Statement | (2,697) | (1,053)
Recognized in Other Comprehensive Income |  | (17)
Recognized in Equity | 3 |
Translation and Other | 282 | (418)
Ending balance | 5,466 | 7,878
Pensions and post-employment benefits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 208 | 352
Recognized in Income Statement | 27 | (87)
Recognized in Other Comprehensive Income | 7 | (54)
Translation and Other |  | (3)
Ending balance | 242 | 208
Tax credits [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 454 | 875
Recognized in Income Statement | (224) | (369)
Translation and Other | 31 | (52)
Ending balance | 261 | 454
Accrued interest [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | 1 | 17
Recognized in Income Statement |  | (12)
Recognized in Equity |  | (3)
Translation and Other |  | (1)
Ending balance | 1 | 1
Real estate [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (1,062) | (1,396)
Recognized in Income Statement | 150 | 284
Recognized in Other Comprehensive Income | (1) | (9)
Translation and Other | (46) | 59
Ending balance | (959) | (1,062)
Securities and other investments [member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (3,807) | (6,064)
Recognized in Income Statement | 1,234 | 2,172
Recognized in Other Comprehensive Income | 136 | (239)
Recognized in Equity | 1 |
Translation and Other | (253) | 324
Ending balance | (2,689) | (3,807)
Sale of investments [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (105) | (163)
Recognized in Income Statement | 18 | 58
Ending balance | (87) | (105)
Goodwill and intangible assets [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (825) | (1,059)
Recognized in Income Statement | 18 | 197
Translation and Other | (40) | 37
Ending balance | (847) | (825)
Other [Member] |  |
Reconciliation of changes in deferred tax liability (asset) [line items] |  |
Beginning balance | (50) | 210
Recognized in Income Statement | 157 | (548)
Recognized in Other Comprehensive Income | 6 | (1)
Recognized in Equity | (4) | 2
Translation and Other | (12) | 287
Ending balance | $ 97 | $ (50)

X
- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81&doctype=Standard -URIDate 2018-03-16 + Details
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