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Debt - Summary of Debt Continuity (Detail) $ in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($)
Financial Instruments [Abstract] |  |  |  |
Borrowings at beginning of period | $ 4,913 | $ 6,255 | $ 3,204 | $ 4,162
Cash flows |  |  |  |
Proceeds from debt | 1,305 | 1,639 | 1,802 | 2,426
Redemption, purchase or repayment of debt | (124) | (155) | (338) | (457)
Revolving credit facilities | (262) | (335) | 262 | 363
Non-cash changes |  |  |  |
Loss on debt redemption or purchase | 0 | 0 | 8 | 11
Changes in foreign exchange rates | 0 | (10) | 0 | (216)
Finance fees and discount amortization | (29) | (36) | (29) | (39)
Other | 13 | 16 | 4 | 5
Borrowings at end of period | $ 5,816 | $ 7,374 | $ 4,913 | $ 6,255

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- Definition The increase (decrease) in liabilities arising from financing activities resulting from the effect of changes in foreign exchange rates. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 44B -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_44B_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The increase (decrease) in liabilities arising from financing activities resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Liabilities arising from financing activities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 44B -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_44B_e&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The amount of liabilities for which cash flows were, or future cash flows will be, classified in the statement of cash flows as cash flows from financing activities. [Refer: Cash flows from (used in) financing activities; Liabilities] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 44D -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_44D&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Cash Flows From Used In Increase Decrease In Borrowings [abstract] + References No definition available. + Details
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- Definition Financial Instruments [Abstract] + References No definition available. + Details
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- Definition Non-cash transactions, finance fees and discount amortization. + References No definition available. + Details
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