XML 71 R43.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Accounting Changes - (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2018
Disclosure of changes in accounting policies, accounting estimates and errors [Abstract] |
Disclosure Of Comparative Information Prepared Under Previous GAAP [Table Text Block] | Condensed Consolidated Statement of Earnings (Loss)
Year ended Dec. 31, 2018 |  | Reported in accordance with IAS 18 and IAS 11 |  | Adjustments |  | As reported under IFRS 15 |
Revenues |  | 2,253 |  | (4 | ) | 2,249 |
Fuel, carbon costs and purchased power |  | (1,109 | ) | 9 |  | (1,100 | )
Net interest expense |  | (243 | ) | (7 | ) | (250 | )
Net earnings impact |  | (88 | ) | (2 | ) | (90 | )
Condensed Consolidated Statements of Financial Position
As at Dec. 31, 2018 |  | Reported in accordance with IAS 18 and IAS 11 |  | Adjustments |  | As reported under IFRS 15 |
Deferred income tax liabilities |  | 505 |  | (4 | ) | 501 |
Contract liability |  | 68 |  | 19 |  | 87 |
Deficit |  | (1,481 | ) | (15 | ) | (1,496 | )

X
- Definition Disclosure Of Comparative Information Prepared Under Previous GAAP [Table Text Block] + References No definition available. + Details
Name: | tac_DisclosureOfComparativeInformationPreparedUnderPreviousGAAPTableTextBlock
Namespace Prefix: | tac_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Disclosure of changes in accounting policies, accounting estimates and errors [Abstract] + References No definition available. + Details
Name: | tac_DisclosureofchangesinaccountingpoliciesaccountingestimatesanderrorsAbstract
Namespace Prefix: | tac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration