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Capital Disclosure of cash flow statement (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of classes of share capital [line items] |  |  |
Cash flows from (used in) operating activities | $ 820 | $ 626 | $ 744
Increase (decrease) in cash flow from (used in) operating activities | 194 |  |
Change in non-cash operating working capital balances | 44 | 114 | (73)
Increase (decrease) in non cash working capital | (70) |  |
Cash flow from operations before changes in working capital | 864 | 740 | 671
Increase (decrease) in cash flow from operations before changes in working capital | 124 |  |
Distributions paid to subsidiaries’ non-controlling interests | 165 | 172 | 151
Increase (decrease) in dividends paid to non controlling interests | 7 |  |
Property, plant and equipment expenditures | 277 | 338 | 358
Increase (decrease) in property, plant and equipment expenditure | 61 |  |
Net inflows (outflows) of cash | 336 | 144 |
Increase (decrease) in net inflows (outflows) of cash | 192 |  |
Undrawn credit facilities | 900 | 1,400 |
Common shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Dividends paid | 46 | 46 | 69
Increase (decrease) in dividends paid | 0 |  |
Preferred shares |  |  |
Disclosure of classes of share capital [line items] |  |  |
Dividends paid | 40 | $ 40 | $ 42
Increase (decrease) in dividends paid | $ 0 |  |

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