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Intangible Assets (Notes)
 12 Months Ended
Dec. 31, 2019
Disclosure of detailed information about intangible assets [abstract]  
Intangible Assets Intangible Assets
A reconciliation of the changes in the carrying amount of intangible assets is as follows:
 Coal rightsSoftware
and other		Power
sale
contracts		Intangibles
under
development		Total
Cost     
As at Dec. 31, 2017178  314  223  29  744  
Additions(1)
—  —  —  53  53  
Retirements and disposals(2)
—  (2) —  —  (2) 
Change in foreign exchange rates—  3  —  —  3  
Transfers7  24  14  (36) 9  
As at Dec. 31, 2018185  339  237  46  807  
Assets transferred to right of use assets on
implementation of IFRS 16 (Note 3 and 18)		—  (5) —  —  (5) 
Additions—  —  —  14  14  
Acquisition—  1  —  15  16  
Disposals (Note 4(D))(37) (1) —  —  (38) 
Change in foreign exchange rates—  (4) (1) (1) (6) 
Transfers1  48  14  (63) —  
As at Dec. 31, 2019149  378  250  11  788  
Accumulated amortization     
As at Dec. 31, 2017125  188  67  —  380  
Amortization9  32  9  —  50  
Retirements and disposals—  (1) —  —  (1) 
Change in foreign exchange rates—  2  —  —  2  
Transfers(17) —  20  —  3  
As at Dec. 31, 2018117  221  96  —  434  
Assets transferred to right of use assets on
implementation of IFRS 16 (Note 3 and 18)		—  (3) —  —  (3) 
Amortization8  31  11  —  50  
Disposals (Note 4(D))(9) (1) —  —  (10) 
Change in foreign exchange rates—  (1) —  —  (1) 
Transfers1  (1) —  —  —  
As at Dec. 31, 2019117  246  107  —  470  
Carrying amount     
As at Dec. 31, 201753  126  156  29  364  
As at Dec. 31, 201868  118  141  46  373  
As at Dec. 31, 201932  132  143  11  318  
(1) Includes $33 million related to the acquisition of Big Level.
(2) Includes the impairment charge of $1 million relating to Kent Breeze. See Note 7 for further details.