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Accumulated Other Comprehensive Income (Loss) (Components of Accumulated Other Comprehensive Income) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | $ 8,358 | $ 7,204
Net current period other comprehensive income (loss) | [1] | (244) | 506
Ending Balance |  | 8,601 | 8,358
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | [2] | 338 | (165)
Other comprehensive income (loss) before reclassifications |  | (320) | 504
Amounts reclassified from accumulated other comprehensive income loss |  | 77 | (1)
Net current period other comprehensive income (loss) | [2] | (243) | 503
Ending Balance | [2] | 95 | 338
Unrealized (loss) gain on translation of self-sustaining foreign operations |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | 654 | 30
Other comprehensive income (loss) before reclassifications |  | (401) | 624
Amounts reclassified from accumulated other comprehensive income loss |  | 0 | 0
Net current period other comprehensive income (loss) |  | (401) | 624
Ending Balance |  | 253 | 654
Net change in net investment hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (74) | 48
Other comprehensive income (loss) before reclassifications |  | 78 | (122)
Amounts reclassified from accumulated other comprehensive income loss |  | 0 | 0
Net current period other comprehensive income (loss) |  | 78 | (122)
Ending Balance |  | 4 | (74)
(Losses) gains on derivatives recognized as cash flow hedges |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (7) | (3)
Other comprehensive income (loss) before reclassifications |  | 3 | 2
Amounts reclassified from accumulated other comprehensive income loss |  | 3 | (6)
Net current period other comprehensive income (loss) |  | 6 | (4)
Ending Balance |  | (1) | (7)
Net change on available-for-sale investments |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (1) | 3
Other comprehensive income (loss) before reclassifications |  | 0 | 0
Amounts reclassified from accumulated other comprehensive income loss |  | 0 | (4)
Net current period other comprehensive income (loss) |  | 0 | (4)
Ending Balance |  | (1) | (1)
Net change in unrecognized pension and post-retirement benefit costs |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  | (234) | (243)
Other comprehensive income (loss) before reclassifications |  | 0 | 0
Amounts reclassified from accumulated other comprehensive income loss |  | 74 | 9
Net current period other comprehensive income (loss) |  | 74 | 9
Ending Balance |  | $ (160) | $ (234)
[1] | 4) Net of tax expense of $10 million (2018 - $11 million tax recovery) for the year ended December 31, 2019.
[2] | (1) Accumulated Other Comprehensive Income (Loss) ("AOCI") ("AOCL")

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