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accounting policy developments - Impacts of application of IFRS 16 on consolidated statements of financial position (Details) $ in Millions | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Jan. 01, 2019 CAD ($) | Dec. 31, 2017 CAD ($) | Jan. 01, 2017 CAD ($) | Dec. 31, 2016 CAD ($)
Non-current assets |  |  |  |  |
Property, plant and equipment, net | $ 12,091 | $ 12,100 | $ 11,368 | $ 10,464 |
Current liabilities |  |  |  |  |
Provisions | 129 | 100 | 78 | 124 |
Current maturities of long-term debt | 836 | 800 | 1,404 | 1,327 |
Non-current liabilities |  |  |  |  |
Provisions | 728 | 700 | 511 | 395 |
Long-term debt | 13,265 | 13,300 | 12,256 | 11,604 |
Other long-term liabilities | 738 | 700 | 847 | 736 |
Deferred income taxes | 3,152 | 3,200 | 2,941 | 2,511 |
Owners' equity |  |  |  |  |
Retained earnings |  | 4,500 |  |  |
Accumulated other comprehensive income | 4 |  | 53 |  | $ 41
Non-controlling interests | $ 82 | 100 | $ 42 | $ 19 |
Weighted-average discount rate reflected in the lease liability recognized on transition | 4.55 |  |  |  |
Impact from discounting minimum lease payments (as a percent) | 0.667 |  |  |  |
Impact from including payments for leases that commence subsequent to December 31, 2018 (as a percent) | 0.333 |  |  |  |
Maximum |  |  |  |  |
Owners' equity |  |  |  |  |
Accumulated other comprehensive income |  | 100 |  |  |
IFRS 16 effects |  |  |  |  |
Non-current assets |  |  |  |  |
Property, plant and equipment, net |  | 1,000 |  |  |
Current liabilities |  |  |  |  |
Current maturities of long-term debt |  | 200 |  |  |
Non-current liabilities |  |  |  |  |
Long-term debt |  | 1,100 |  |  |
Deferred income taxes |  | (100) |  |  |
Owners' equity |  |  |  |  |
Retained earnings |  | (200) |  |  |
IFRS 16 effects | Maximum |  |  |  |  |
Current liabilities |  |  |  |  |
Provisions |  | 100 |  |  |
Non-current liabilities |  |  |  |  |
Provisions |  | 100 |  |  |
Other long-term liabilities |  | 100 |  |  |
Owners' equity |  |  |  |  |
Accumulated other comprehensive income |  | 100 |  |  |
Non-controlling interests |  | 100 |  |  |
Pro forma |  |  |  |  |
Non-current assets |  |  |  |  |
Property, plant and equipment, net |  | 13,100 |  |  |
Current liabilities |  |  |  |  |
Provisions |  | 100 |  |  |
Current maturities of long-term debt |  | 1,000 |  |  |
Non-current liabilities |  |  |  |  |
Provisions |  | 700 |  |  |
Long-term debt |  | 14,400 |  |  |
Other long-term liabilities |  | 700 |  |  |
Deferred income taxes |  | 3,100 |  |  |
Owners' equity |  |  |  |  |
Retained earnings |  | 4,300 |  |  |
Non-controlling interests |  | 100 |  |  |
Pro forma | Maximum |  |  |  |  |
Owners' equity |  |  |  |  |
Accumulated other comprehensive income |  | $ 100 |  |  |

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