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income taxes - Temporary differences (Details) - CAD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of temporary differences |  |  |
Balance at beginning of period | $ 3,208 | $ 3,090 |
Deferred income tax expense recognized in Net income | 76 | 115 |
Deferred income tax expense recognized in Other comprehensive income | (122) | (78) |
Deferred income taxes charged directly to owners' equity and other | 603 | 81 |
Balance at end of period | 3,765 | 3,208 |
Deferred tax assets and liabilities |  |  |
Deferred tax liabilities | 3,776 | 3,214 | $ 3,095
Deferred tax assets | 11 | 6 | $ 5
Property, plant, and equipment owned and intangible assets subject to amortization |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | 1,616 | 1,204 |
Deferred income tax expense recognized in Net income | 85 | 332 |
Deferred income taxes charged directly to owners' equity and other | 621 | 80 |
Balance at end of period | 2,322 | 1,616 |
Intangible assets with indefinite lives |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | 1,608 | 1,718 |
Deferred income tax expense recognized in Net income | 82 | (110) |
Deferred income taxes charged directly to owners' equity and other | 2 |  |
Balance at end of period | 1,692 | 1,608 |
Property plant and equipment (leased), net of lease liabilities |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | (77) | (83) |
Deferred income tax expense recognized in Net income | 37 | 6 |
Balance at end of period | (40) | (77) |
Contract assets and liabilities |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | 418 | 496 |
Deferred income tax expense recognized in Net income | (111) | (78) |
Balance at end of period | 307 | 418 |
Net pension and share-based compensation amounts |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | (140) | (21) |
Deferred income tax expense recognized in Net income | (31) | (9) |
Deferred income tax expense recognized in Other comprehensive income | (109) | (110) |
Balance at end of period | (280) | (140) |
Provisions not currently deductible |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | (212) | (189) |
Deferred income tax expense recognized in Net income | 8 | (23) |
Balance at end of period | (204) | (212) |
Losses available to be carried forward |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | (11) | (6) |
Deferred income tax expense recognized in Net income | (33) | (5) |
Deferred income taxes charged directly to owners' equity and other | (4) |  |
Balance at end of period | (48) | (11) |
Other |  |  |
Reconciliation of temporary differences |  |  |
Balance at beginning of period | 6 | (29) |
Deferred income tax expense recognized in Net income | 39 | 2 |
Deferred income tax expense recognized in Other comprehensive income | (13) | 32 |
Deferred income taxes charged directly to owners' equity and other | (16) | 1 |
Balance at end of period | $ 16 | $ 6 |

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