Goodwill (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of detailed information about goodwill [Abstract]

Disclosure of detailed information about goodwill

Goodwill acquired through business combinations has been allocated to CGUs that are expected to benefit from the synergies of the acquisitions. Goodwill by segments are as follows:



As at Dec. 31	2018	2017
Hydro	259	259
Wind and Solar	175	174
Energy Marketing	30	30
Total goodwill	464	463

A reconciliation of the changes in the carrying amount of intangible assets is as follows:



	Coal rights		Software and other		Power sale contracts		Intangibles under development		Total
Cost
As at Dec. 31, 2016	178		268		223		24		693
Additions	—		31		—		20		51
Change in foreign exchange rates	—		(3	)	—		—		(3	)
Transfers	—		18		—		(15	)	3
As at Dec. 31, 2017	178		314		223		29		744
Additions⁽¹⁾	—		—		—		53		53
Retirements and disposals⁽²⁾	—		(2	)	—		—		(2	)
Change in foreign exchange rates	—		3		—		—		3
Transfers	7		24		14		(36	)	9
As at Dec. 31, 2018	185		339		237		46		807

Accumulated amortization
As at Dec. 31, 2016	115		163		60		—		338
Amortization	8		24		9		—		41
Change in foreign exchange rates	—		1		—		—		1
Transfers	2		—		(2	)	—		—
As at Dec. 31, 2017	125		188		67		—		380
Amortization	9		32		9		—		50
Retirements and disposals	—		(1	)	—		—		(1	)
Change in foreign exchange rates	—		2		—		—		2
Transfers	(17	)	—		20		—		3
As at Dec. 31, 2018	117		221		96		—		434

Carrying amount
As at Dec. 31, 2016	63		105		163		24		355
As at Dec. 31, 2017	53		126		156		29		364
As at Dec. 31, 2018	68		118		141		46		373