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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
Disclosure of changes in accounting policies, accounting estimates and errors [Abstract]  
Disclosure of detailed information about property, plant and equipment
Estimated remaining useful lives of the components of depreciable assets, categorized by asset class, are as follows:
Coal generation
2-10 years
Pipeline
50 years
Gas generation
2-30 years
Hydro generation
2-60 years
Wind generation
2-30 years
Mining property and equipment
2-10 years
Capital spares and other
2-60 years
A reconciliation of the changes in the carrying amount of PP&E is as follows:
 LandCoal
generation		Gas generationRenewable
generation		Mining property
and equipment		Assets under
construction
Capital spares
and other(1)
Total
Cost        
As at Dec. 31, 201795  5,888  1,982  3,228  1,315  95  370  12,973  
Additions(2)
—  —  —  1  —  275  8  284  
Additions - finance lease—  —  —  —  10  —  —  10  
Disposals(3) —  —  —  (1) —  (3) (7) 
Impairment charge (Note 7)—  (38) —  (11) —  —  —  (49) 
Revisions and additions to decommissioning and restoration costs—  (12) (1) (3) (16) —  —  (32) 
Retirement of assets—  (47) (17) (6) (16) —  (4) (90) 
Change in foreign exchange rates2  105  (13) 26  7  4  —  131  
Transfers—  41  13  51  39  (174) 12  (18) 
As at Dec. 31, 201894  5,937  1,964  3,286  1,338  200  383  13,202  
Adjustments on implementation of IFRS 16 (Note 3)(3)
—  —  —  (7) (101) —  —  (108) 
Additions(4)
—  —  —  —  —  407  115  522  
Acquisitions (Note 4(D) and 4(J))(5)
—  300  —  —  —  139  —  439  
Disposals(6)
(2) (389) (260) —  (34) —  (19) (704) 
Impairment (charges) reversals (Note 7)—  448  —  (2) (15) —  —  431  
Revisions and additions to decommissioning and restoration costs—  (62) 11  2  26  —  —  (23) 
Retirement of assets—  (158) (26) (7) (10) —  —  (201) 
Change in foreign exchange rates(1) (63) (40) (17) (3) (4) (6) (134) 
Transfers(7)
—  103  22  319  25  (514) 16  (29) 
As at Dec. 31, 201991  6,116  1,671  3,574  1,226  228  489  13,395  
Accumulated depreciation                        
As at Dec. 31, 2017—  3,431  1,072  1,037  713  —  142  6,395  
Depreciation—  306  79  123  125  —  16  649  
Retirement of assets—  (56) (13) (2) (12) —  —  (83) 
Disposals—  —  —  —  (1) —  (4) (5) 
Change in foreign exchange rates—  84  (3) 6  5  —  —  92  
Transfers—  —  (7) (3) —  —  —  (10) 
As at Dec. 31, 2018—  3,765  1,128  1,161  830  —  154  7,038  
Adjustments on implementation of IFRS 16 (Note 3)(3)
—  —  —  (3) (43) —  —  (46) 
Depreciation—  304  77  136  97  —  16  630  
Retirement of assets—  (158) (23) (3) (6) —  —  (190) 
Disposals(5)
—  (170) (255) —  (14) —  —  (439) 
Impairment reversal (Note 7)—  297  —  —  —  —  —  297  
Change in foreign exchange rates—  (52) (16) (4) (2) —  (2) (76) 
Transfers—  10  (11) (3) (22) —  —  (26) 
As at Dec. 31, 2019—  3,996  900  1,284  840  —  168  7,188  
Carrying amount                        
As at Dec. 31, 201795  2,457  910  2,191  602  95  228  6,578  
As at Dec. 31, 201894  2,172  836  2,125  508  200  229  6,164  
As at Dec. 31, 201991  2,120  771  2,290  386  228  321  6,207  
(1) Includes major spare parts and stand-by equipment available, but not in service, and spare parts used for routine, preventive or planned maintenance, and the Australian gas pipeline.
(2) Includes $7 million related to the acquisition of Big Level.
(3) Includes net $33 million transferred to right of use assets and $29 million of finance lease assets that were derecognized on implementation of IFRS 16. Refer to Note 3 for further details.
(4) Includes cash additions of $417 million (including $169 million related to the construction of the US Wind Projects), $100 million related to the Pioneer Pipeline (including $15 million transferred from other assets) and $5 million related to the Keephills 3 and Genesee 3 asset swap. Refer to Note 4 for further details of these transactions.
(5) Includes $308 million related to the acquisition of the Keephills 3 facility with $300 million included in coal generation and the remainder in assets under construction.
(6) In 2019, we sold the Genesee 3 facility and sold the major components of the Mississauga facility. In addition, Centralia sold boiler parts included in capital spares and other for a net loss of $17 million. The Sunhills mine also sold trucks included in mining property and equipment for a net loss of $18 million. Both were recognized in other gains on the statement of earnings (loss).
(7) Mainly relates to transferring the Pioneer Pipeline and US Wind Projects from assets under construction to coal generation and renewable generation, respectively.
Disclosure of detailed information about intangible assets Estimated remaining useful lives of intangible assets are as follows:
Software
2-7 years
Power sale contracts
1-20 years