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Share Capital - Common Shares Issued and Outstanding (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2019 CAD ($) shares $ / shares | Dec. 31, 2018 CAD ($) shares $ / shares | Aug. 14, 2019 shares | Aug. 14, 2018 shares | Aug. 14, 2017 shares
Reconciliation of number of shares outstanding [abstract] |  |  |  |  |
Stock options exercised (in shares) | 772,000 | 399,000 |  |  |
Common shares issued as consideration for business acquisition (in shares) | 0 | 100,000 |  |  |
Common shares issued as consideration for business acquisition | $ | $ 0 | $ 4,000,000 |  |  |
Payments to acquire or redeem entity's shares | $ | $ 592,000,000 | $ 641,000,000 |  |  |
Common shares |  |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |  |
Number of shares outstanding, beginning of year (in shares) | 598,500,000 | 610,500,000 |  |  |
Stock options exercised (in shares) | 800,000 | 400,000 |  |  |
Common shares purchased for cancellation (in shares) | (11,500,000) | (12,500,000) |  |  |
Number of shares outstanding, end of year (in shares) | 587,800,000 | 598,500,000 |  |  |
Balance, beginning of year | $ | $ 8,419,000,000 | $ 8,582,000,000 |  |  |
Stock options exercised | $ | 28,000,000 | 16,000,000 |  |  |
Common shares purchased for cancellation | $ | (158,000,000) | (183,000,000) |  |  |
Balance, end of year | $ | $ 8,289,000,000 | $ 8,419,000,000 |  |  |
Number of shares authorized for purchase and cancellation (in shares) |  |  | 15,000,000 | 18,000,000 | 11,500,000.0
Purchase and cancellation of treasury shares (cad per share) | $ / shares | $ 52.01 | $ 44.91 |  |  |
Payments to acquire or redeem entity's shares | $ | $ 592,000,000 | $ 0 |  |  |
2018 NCIB | Common shares |  |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |  |
Common shares purchased for cancellation (in shares) |  | 100,000.0 |  |  |
Third-Party Share Repurchase Program | Common shares |  |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |  |
Common shares purchased for cancellation (in shares) |  | 1,100,000 |  |  |
2018 NCIB and 2019 NCIB | Common shares |  |  |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |  |  |
Common shares purchased for cancellation (in shares) | 11,400,000.0 |  |  |  |

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- Definition The increase (decrease) in equity resulting from the exercise of options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_106_d&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2019-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2019-03-27 + Details
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