Segment Disclosures (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure of entity's operating segments [Abstract]

Earnings Information



Year ended Dec. 31, 2018	Canadian Coal		US Coal		Canadian Gas	Australian Gas	Wind and Solar		Hydro	Energy Marketing	Corporate		Total
Revenues	912		442		232	165	282		156	67	(7	)	2,249
Fuel and purchased power	666		314		96	8	17		6	—	(7	)	1,100
Gross margin	246		128		136	157	265		150	67	—		1,149
Operations, maintenance and administration	171		61		48	37	50		38	24	86		515
Depreciation and amortization	241		74		43	49	110		30	2	25		574
Asset impairment charge	38		—		—	—	12		—	—	23		73
Taxes, other than income taxes	13		5		1	—	8		3	—	1		31
Net other operating expense (income)	(198	)	—		—	—	(6	)	—	—	—		(204	)
Operating income (loss)	(19	)	(12	)	44	71	91		79	41	(135	)	160
Finance lease income	—		—		8	—	—		—	—	—		8
Net interest expense													(250	)
Foreign exchange loss													(15	)
Gain on sale of assets and other													1
Losses before income taxes													(96	)



Year ended Dec. 31, 2017	Canadian Coal		US Coal	Canadian Gas		Australian Gas	Wind and Solar	Hydro	Energy Marketing	Corporate		Total
Revenues	999		435	261		135	287	121	69	—		2,307
Fuel and purchased power	585		293	101		14	17	6	—	—		1,016
Gross margin	414		142	160		121	270	115	69	—		1,291
Operations, maintenance and administration	192		51	50		31	48	37	24	84		517
Depreciation and amortization	317		73	38		37	111	31	2	26		635
Asset impairment charge	20		—	—		—	—	—	—	—		20
Taxes, other than income taxes	13		4	1		—	8	3	—	1		30
Net other operating expense (income)	(40	)	—	(9	)	—	—	—	—	—		(49	)
Operating income (loss)	(88	)	14	80		53	103	44	43	(111	)	138
Finance lease income	—		—	11		43	—	—	—	—		54
Net interest expense												(247	)
Foreign exchange loss												(1	)
Gain on sale of assets												2
Earnings before income taxes												(54	)



Year ended Dec. 31, 2016	Canadian Coal		US Coal		Canadian Gas		Australian Gas	Wind		Hydro	Energy Marketing	Corporate		Total
Revenues	1,048		354		402		119	272		126	76	—		2,397
Fuel and purchased power	451		281		185		20	18		8	—	—		963
Gross margin	597		73		217		99	254		118	76	—		1,434
Operations, maintenance and administration	178		54		54		25	52		33	24	69		489
Depreciation and amortization	242		61		100		17	119		33	3	26		601
Asset impairment reversals	—		—		—		—	28		—	—	—		28
Taxes, other than income taxes	13		4		1		1	8		3	—	1		31
Net other operating expense (income)	(2	)	—		(191	)	—	(1	)	—	—	1		(193	)
Operating income (loss)	166		(46	)	253		56	48		49	49	(97	)	478
Finance lease income	—		—		14		52	—		—	—	—		66
Net interest expense														(229	)
Foreign exchange loss														(5	)
Gain on sale of assets														4
Earnings before income taxes														314

Disclosure of selected consolidated statements of financial position information

Selected Consolidated Statements of Financial Position Information



As at Dec. 31, 2018	Canadian Coal	US Coal	Canadian Gas	Australian Gas	Wind and Solar	Hydro	Energy Marketing	Corporate	Total
Goodwill	—	—	—	—	175	259	30	—	464
PP&E	2,587	332	391	554	1,799	481	1	19	6,164
Intangible assets	81	7	4	41	173	4	11	52	373

As at Dec. 31, 2017	Canadian Coal	US Coal	Canadian Gas	Australian Gas	Wind and Solar	Hydro	Energy Marketing	Corporate	Total
Goodwill	—	—	—	—	174	259	30	—	463
PP&E	2,902	370	416	606	1,764	497	1	22	6,578
Intangibles	91	7	3	42	149	3	13	56	364

Disclosure of components in other non-current assets

Additions to non-current assets are as follows:



Year ended Dec. 31, 2018	Canadian Coal	US Coal	Canadian Gas	Australian Gas	Wind and Solar	Hydro	Energy Marketing	Corporate	Total
Additions to non-current assets:
PP&E	101	14	21	6	117	16	—	2	277
Intangible assets	3	—	—	—	—	—	—	17	20

Year ended Dec. 31, 2017	Canadian Coal	US Coal	Canadian Gas	Australian Gas	Wind and Solar	Hydro	Energy Marketing	Corporate	Total
Additions to non-current assets:
PP&E	116	35	31	114	20	16	—	6	338
Intangibles	5	1	—	29	—	—	—	16	51

Year ended Dec. 31, 2016	Canadian Coal	US Coal	Canadian Gas	Australian Gas	Wind and Solar	Hydro	Energy Marketing	Corporate	Total
Additions to non-current assets:
PP&E	159	15	11	107	16	43	—	7	358
Intangibles	3	1	1	—	—	—	—	16	21

Disclosure of reconciliation between depreciation and amortization

The reconciliation between depreciation and amortization reported on the Consolidated Statements of Earnings (Loss) and the Consolidated Statements of Cash Flows is presented below:



Year ended Dec. 31	2018	2017	2016
Depreciation and amortization expense on the Consolidated Statements of Earnings (Loss)	574	635	601
Depreciation included in fuel and purchased power (Note 6)	136	73	63
Depreciation and amortization on the Consolidated Statements of Cash Flows	710	708	664

Disclosure of geographical areas

Revenues



Year ended Dec. 31	2018	2017	2016
Canada	1,573	1,663	1,828
US	511	509	450
Australia	165	135	119
Total revenue	2,249	2,307	2,397

II. Non-Current Assets



	Property, plant and equipment		Intangible assets		Other assets		Goodwill

As at Dec. 31	2018	2017	2018	2017	2018	2017	2018	2017
Canada	4,953	5,353	273	297	101	105	417	417
US	657	619	59	25	50	43	47	46
Australia	554	606	41	42	83	89	—	—
Total	6,164	6,578	373	364	234	237	464	463