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other comprehensive income (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Items that may subsequently be reclassified to income |  |
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance beginning | $ (1) | $ (20)
Changes in unrealized fair value of derivatives designated as cash flow hedges total, before tax | (24) | 26
Income tax relating to changes in unrealized fair value of derivatives designated as cash flow hedges total | (6) | 7
Changes in unrealized fair value of derivatives designated as cash flow hedges total, net | (18) | 19
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance ending | (19) | (1)
Accumulated foreign currency translation balance beginning | 53 | 48
Cumulative foreign currency translation adjustment, before tax | (30) | 5
Cumulative foreign currency translation adjustment, net | (30) | 5
Accumulated foreign currency translation balance ending | 23 | 53
Accumulated available-for-sale financial assets balance beginning | 1 | 13
Change in unrealized fair value of available-for-sale financial assets, before tax | (1) | (14)
Income tax related to change in unrealized fair value of available-for-sale financial assets |  | (2)
Change in measurement of investment financial assets | (1) | (12)
Accumulated available-for-sale financial assets balance ending |  | 1
Accumulated other comprehensive income balance beginning | 53 | 41
Accumulated other comprehensive income excluding employee defined benefit plan re-measurements, before tax | (55) | 17
Income tax relating to accumulated other comprehensive income | (6) | 5
Accumulated other comprehensive income excluding employee defined benefit plan re-measurements, net | (49) | 12
Accumulated other comprehensive income balance ending | 4 | 53
Item never reclassified to income |  |
Employee defined benefit plans re-measurements, before tax | 452 | (234)
Income tax relating to employee defined benefit plan re-measurements | 119 | (62)
Employee defined benefit plans re-measurements, net | 333 | (172)
Other comp. income, before tax | 397 | (217)
Aggregated income tax relating to components of other comprehensive income | 113 | (57)
Total | 284 | (160)
Attributable to: |  |
Accumulated other comprehensive income | 53 | 41
Currency risk |  |
Items that may subsequently be reclassified to income |  |
Changes in unrealized fair value of derivatives designated as cash flow hedges gains (losses) arising, before tax | 233 | (132)
Income tax relating to changes in unrealized fair value of derivatives designated as cash flow hedges gains (losses) arising | 40 | (21)
Changes in unrealized fair value of derivatives designated as cash flow hedges gains (losses) transferred to net income, before tax | 247 | (151)
Income tax relating to change in unrealized fair value of derivatives designated as cash flow hedges gains (losses) transferred to net income | (44) | 27
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance beginning | (9) | (22)
Changes in unrealized fair value of derivatives designated as cash flow hedges total, before tax | (14) | 19
Income tax relating to changes in unrealized fair value of derivatives designated as cash flow hedges total | (4) | 6
Changes in unrealized fair value of derivatives designated as cash flow hedges total, net | (10) | 13
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance ending | (19) | (9)
Other market risk |  |
Items that may subsequently be reclassified to income |  |
Changes in unrealized fair value of derivatives designated as cash flow hedges gains (losses) arising, before tax | (8) | 24
Income tax relating to changes in unrealized fair value of derivatives designated as cash flow hedges gains (losses) arising | (2) | 6
Changes in unrealized fair value of derivatives designated as cash flow hedges gains (losses) transferred to net income, before tax | 2 | 17
Income tax relating to change in unrealized fair value of derivatives designated as cash flow hedges gains (losses) transferred to net income |  | (5)
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance beginning | 8 | 2
Changes in unrealized fair value of derivatives designated as cash flow hedges total, before tax | (10) | 7
Income tax relating to changes in unrealized fair value of derivatives designated as cash flow hedges total | (2) | 1
Changes in unrealized fair value of derivatives designated as cash flow hedges total, net | (8) | 6
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance ending |  | 8
As previously reported |  |
Items that may subsequently be reclassified to income |  |
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance beginning |  | (20)
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance ending | (1) |
Accumulated foreign currency translation balance beginning |  | 48
Accumulated foreign currency translation balance ending | 53 |
Accumulated available-for-sale financial assets balance beginning |  | 16
Accumulated available-for-sale financial assets balance ending | 5 |
Accumulated other comprehensive income balance beginning |  | 44
Accumulated other comprehensive income balance ending | 57 |
Attributable to: |  |
Accumulated other comprehensive income | 57 | 44
As previously reported | Currency risk |  |
Items that may subsequently be reclassified to income |  |
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance beginning |  | (22)
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance ending | (9) |
As previously reported | Other market risk |  |
Items that may subsequently be reclassified to income |  |
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance beginning |  | 2
Accumulated change in unrealized fair value of derivatives designated as cash flow hedge balance ending | 8 |
IFRS 9 effects |  |
Items that may subsequently be reclassified to income |  |
Accumulated available-for-sale financial assets balance beginning |  | (3)
Accumulated available-for-sale financial assets balance ending | (4) |
Accumulated other comprehensive income balance beginning |  | (3)
Accumulated other comprehensive income balance ending | (4) |
Attributable to: |  |
Accumulated other comprehensive income | (4) | (3)
Common equity |  |
Items that may subsequently be reclassified to income |  |
Accumulated other comprehensive income balance ending | 12 |
Item never reclassified to income |  |
Total | 298 | (164)
Attributable to: |  |
Accumulated other comprehensive income | 12 |
Non-controlling interests |  |
Items that may subsequently be reclassified to income |  |
Accumulated other comprehensive income balance ending | (8) |
Item never reclassified to income |  |
Total | (14) | $ 4
Attributable to: |  |
Accumulated other comprehensive income | $ (8) |

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- Definition The amount of income tax relating to amounts recognised in other comprehensive income in relation to remeasurements of defined benefit plans. [Refer: Other comprehensive income; Reserve of remeasurements of defined benefit plans; Defined benefit plans [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph ab -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_ab&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 90 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_90&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of other comprehensive income, before tax, related to exchange differences on translation of financial statements of foreign operations. [Refer: Other comprehensive income, before tax] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_7&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition A component of equity representing accumulated gains and losses on remeasuring available-for-sale financial assets. [Refer: Financial assets available-for-sale] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-02&anchor=para_78_e&doctype=Standard&book=b_pdf -URIDate 2018-03-16 + Details
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- Definition The amount of income tax relating to amounts recognized in other comprehensive income in relation to cash flow hedges in accumulated other comprehensive income. + References No definition available. + Details
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