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Accumulated Other Comprehensive Income (Details) - CAD CAD in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015
Accumulated other comprehensive income |  |
Beginning balance | CAD 10,353 | CAD 9,112
Other comprehensive (loss) income | (46) | 662
Ending balance | 16,450 | 10,353
Unrealized foreign currency translation gains (losses) on net investments in foreign operations |  |
Accumulated other comprehensive income |  |
Accumulated other comprehensive income (loss), before tax, opening balance | 1,281 | 273
Other comprehensive income (loss), before tax | (54) | 1,008
Accumulated other comprehensive income (loss), before tax, ending balance | 1,227 | 1,281
(Losses) gains on hedges of net investments in foreign operations |  |
Accumulated other comprehensive income |  |
Accumulated other comprehensive income (loss), before tax, opening balance | (476) | (131)
Other comprehensive income (loss), before tax | 4 | (345)
Accumulated other comprehensive income (loss), before tax, ending balance | (472) | (476)
Net unrealized foreign currency translation gains (losses) |  |
Accumulated other comprehensive income |  |
Income tax recovery (expense), opening balance | 1 | 2
Beginning balance | 806 | 144
Other comprehensive income (loss), tax recovery (expense) | 0 | (1)
Other comprehensive (loss) income | (50) | 662
Income tax recovery (expense), ending balance | 1 | 1
Ending balance | 756 | 806
Realized gain on available-for-sale investment |  |
Accumulated other comprehensive income |  |
Beginning balance | (2) | 0
Other comprehensive (loss) income | 2 | (2)
Ending balance | 0 | (2)
Cash flow hedges (Note 30) |  |
Accumulated other comprehensive income |  |
Accumulated other comprehensive income (loss), before tax, opening balance | 3 | 1
Income tax recovery (expense), opening balance | (1) | 0
Beginning balance | 2 | 1
Other comprehensive income (loss), before tax | 5 | 2
Other comprehensive income (loss), tax recovery (expense) | (2) | (1)
Other comprehensive (loss) income | 3 | 1
Accumulated other comprehensive income (loss), before tax, ending balance | 8 | 3
Income tax recovery (expense), ending balance | (3) | (1)
Ending balance | 5 | 2
Unamortized net actuarial (losses) gains |  |
Accumulated other comprehensive income |  |
Accumulated other comprehensive income (loss), before tax, opening balance | (20) | (20)
Other comprehensive income (loss), before tax | 1 | 0
Accumulated other comprehensive income (loss), before tax, ending balance | (19) | (20)
Unamortized past service costs |  |
Accumulated other comprehensive income |  |
Accumulated other comprehensive income (loss), before tax, opening balance | (1) | (2)
Other comprehensive income (loss), before tax | (2) | 1
Accumulated other comprehensive income (loss), before tax, ending balance | (3) | (1)
Unrealized employee future benefits (losses) gains |  |
Accumulated other comprehensive income |  |
Income tax recovery (expense), opening balance | 6 | 6
Beginning balance | (15) | (16)
Other comprehensive income (loss), tax recovery (expense) | 0 | 0
Other comprehensive (loss) income | (1) | 1
Income tax recovery (expense), ending balance | 6 | 6
Ending balance | (16) | (15)
Accumulated other comprehensive income |  |
Accumulated other comprehensive income |  |
Beginning balance | 791 | 129
Other comprehensive (loss) income | (46) | 662
Ending balance | CAD 745 | CAD 791

X
- Definition Amount before tax of increase (decrease) in accumulated equity from transactions and other events and circumstances from non-owner sources, including portion attributable to noncontrolling interest. Excludes net income (loss), and accumulated changes in equity from transactions resulting from investments by owners (distributions to owners). + References No definition available. + Details
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- Definition Amount before tax, after reclassification adjustments of other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669625-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33775-111570 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669619-108580 + Details
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