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Supplementary Cash Flow Information - Summary of Reconciliation of Liabilities to Cash Flows from Financing Activities (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Lease Liabilities, Beginning of Year | $ 2,957 | $ 1,757 |
Changes From Financing Cash Flows: |  |  |
Issuance of Long-Term Debt | 0 | 1,557 | $ 1,326
(Repayment) of Long-Term Debt | (4,149) | (2,870) | (112)
Principal Repayment of Leases | (302) | (300) | (197)
Non-Cash Changes: |  |  |
Lease Additions | 25 | 110 |
Lease Modifications | 83 | 22 |
Lease Termination | (5) | (1) |
Other inflows (outflows) of cash, classified as financing activities | 2 | 0 | 0
Lease Liabilities, End of Year | 2,836 | 2,957 | 1,757
Common shares |  |  |
Changes From Financing Cash Flows: |  |  |
Variable dividends paid on common shares | 219 | 0 | 0
Dividends Payable |  |  |
Non-Cash Changes: |  |  |
Ending balance, debt | 9 |  |
Dividends Payable | Common shares |  |  |
Changes From Financing Cash Flows: |  |  |
Dividends paid | (682) | (176) | (77)
Variable dividends paid on common shares | (219) |  |
Non-Cash Changes: |  |  |
Base Dividends Declared on Common Shares | 682 | 176 | 77
Dividends Payable | Preference shares |  |  |
Changes From Financing Cash Flows: |  |  |
Dividends paid | (26) | (34) |
Non-Cash Changes: |  |  |
Base Dividends Declared on Common Shares | 35 | 34 |
Short-Term Borrowings |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance, debt | 79 | 121 |
Changes From Financing Cash Flows: |  |  |
Net Issuance (Repayment) of Short-Term Borrowings | 34 | (77) | 117
Acquisition (Note 5) |  | 40 |
Non-Cash Changes: |  |  |
Exchange Rate Movements and Other | 2 | (5) | 4
Ending balance, debt | 115 | 79 | 121
Long-Term Debt |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Beginning balance, debt | 12,385 | 7,441 | 6,699
Changes From Financing Cash Flows: |  |  |
(Repayment) of Revolving Long-Term Debt |  | (350) | (220)
Issuance of Long-Term Debt |  | 1,557 | 1,326
(Repayment) of Long-Term Debt | (4,149) | (2,870) | (112)
Acquisition (Note 5) |  | 6,602 |
Non-Cash Changes: |  |  |
Net Premium (Discount) on Redemption of Long-Term Debt | (29) | 121 | (25)
Finance Costs | (28) | (59) | 5
Exchange Rate Movements and Other | 512 | (57) | (232)
Ending balance, debt | 8,691 | 12,385 | 7,441
Lease Liabilities |  |  |
Disclosure of reconciliation of liabilities arising from financing activities [line items] |  |  |
Lease Liabilities, Beginning of Year | 2,957 | 1,757 | 1,916
Changes From Financing Cash Flows: |  |  |
Principal Repayment of Leases | (302) | (300) | (197)
Acquisition (Note 5) |  | 1,441 |
Non-Cash Changes: |  |  |
Lease Additions | 25 | 110 | 49
Lease Modifications | 83 | 22 | (2)
Lease Re-measurements | 7 | (4) | (2)
Lease Termination | (5) | (1) | (1)
Exchange Rate Movements and Other | 71 | (10) | (6)
Transfers to liabilities related to assets held for sale |  | (58) |
Lease Liabilities, End of Year | $ 2,836 | $ 2,957 | $ 1,757

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