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Accumulated Other Comprehensive Income (Details) - CAD
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period CAD 399,000,000 CAD 399,000,000    
Currency translation adjustment        
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax   25,000,000 CAD 53,000,000  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax [1]   50,000,000 18,000,000 CAD (172,000,000)
Cash flow hedges        
Net gains on derivatives designated as cash flow hedges, net of tax 3,000,000 214,000,000 [2] 179,000,000 [2] 375,000,000 [2]
Other        
Intercompany available-for-sale investments   0 0  
Accumulated other comprehensive income, end of the period   489,000,000 399,000,000  
Income tax relating to exchange differences on translation of other comprehensive income   0 11,000,000 0
Income tax relating to hedges of net investments in foreign operations of other comprehensive income   2,000,000 5,000,000 7,000,000
Net impact related to cash flow hedges   (108,000,000) 51,000,000 89,000,000
Income tax relating to net actuarial gains (losses)   (4,000,000) 4,000,000 0
Reserve of exchange differences on translation [member]        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period (1,000,000) (1,000,000) 52,000,000  
Currency translation adjustment        
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax   (89,000,000) (71,000,000)  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax   64,000,000 18,000,000  
Other        
Accumulated other comprehensive income, end of the period   (26,000,000) (1,000,000) 52,000,000
Income tax relating to exchange differences on translation of other comprehensive income   11,000,000 11,000,000  
Income tax relating to hedges of net investments in foreign operations of other comprehensive income   4,000,000 5,000,000  
Reserve of cash flow hedges [member]        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period 456,000,000 456,000,000 350,000,000  
Cash flow hedges        
Net gains on derivatives designated as cash flow hedges, net of tax   106,000,000 106,000,000  
Other        
Accumulated other comprehensive income, end of the period   562,000,000 456,000,000 350,000,000
Net impact related to cash flow hedges   (108,000,000) 51,000,000  
Reserve of remeasurements of defined benefit plans [member]        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period (38,000,000) (38,000,000) (46,000,000)  
Employee future benefits        
Net actuarial gains (losses) on defined benefit plans, net of tax   (6,000,000) 8,000,000  
Other        
Accumulated other comprehensive income, end of the period   (44,000,000) (38,000,000) (46,000,000)
Income tax relating to net actuarial gains (losses)   (4,000,000) 4,000,000  
Other reserves [member]        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period CAD (18,000,000) (18,000,000) (3,000,000)  
Other        
Change in ownership of TransAlta Renewables   4,000,000 0  
Intercompany available-for-sale investments   11,000,000 (15,000,000)  
Accumulated other comprehensive income, end of the period   CAD (3,000,000) CAD (18,000,000) CAD (3,000,000)
[1] (5) Net of income tax expense of 2 for the year ended Dec. 31, 2017 (2016 - 5 expense, 2015 - 7 expense)
[2] (7) Net of income tax recovery of 77 for the year ended Dec. 31, 2017 (2016 - 92 expense, 2015 - 138 expense).