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Segment Disclosures (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure of entity's operating segments [Abstract] |
Disclosure of operating segments | Earnings Information
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 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 and other |  |  |  |  |  |  |  |  | 2 |
Losses before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (54 | )
Year ended Dec 31, 2016 | Canadian Coal |  | US Coal |  | Canadian Gas |  | Australian Gas |  | Wind and Solar |  | 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 charge | — |  | — |  | — |  | — |  | 28 |  | — |  | — |  | — |  | 28 |
Restructuring provision | — |  | — |  | — |  | — |  | — |  | — |  | — |  | 1 |  | 1 |
Taxes, other than income taxes | 13 |  | 4 |  | 1 |  | 1 |  | 8 |  | 3 |  | — |  | 1 |  | 31 |
Net other operating (income) loss | (2 | ) | — |  | (191 | ) | — |  | (1 | ) | — |  | — |  | — |  | (194 | )
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 |
Year ended Dec 31, 2015 | Canadian Coal |  | US Coal |  | Canadian Gas |  | Australian Gas |  | Wind |  | Hydro |  | Energy Marketing |  | Corporate |  | Total |
Revenues | 912 |  | 372 |  | 454 |  | 114 |  | 250 |  | 116 |  | 49 |  | — |  | 2,267 |
Fuel and purchased power | 441 |  | 316 |  | 204 |  | 20 |  | 19 |  | 8 |  | — |  | — |  | 1,008 |
Gross margin | 471 |  | 56 |  | 250 |  | 94 |  | 231 |  | 108 |  | 49 |  | — |  | 1,259 |
Operations, maintenance, and administration | 194 |  | 50 |  | 67 |  | 21 |  | 48 |  | 29 |  | 12 |  | 71 |  | 492 |
Depreciation and amortization | 237 |  | 63 |  | 75 |  | 20 |  | 99 |  | 25 |  | 1 |  | 25 |  | 545 |
Asset impairment reversals | — |  | (2 | ) | — |  | — |  | — |  | — |  | — |  | — |  | (2 | )
Restructuring provision | 11 |  | 1 |  | 1 |  | — |  | — |  | — |  | 3 |  | 6 |  | 22 |
Taxes, other than income taxes | 12 |  | 3 |  | 3 |  | — |  | 7 |  | 3 |  | — |  | 1 |  | 29 |
Net other operating (income) losses | (7 | ) | — |  | — |  | — |  | — |  | (24 | ) | 56 |  | — |  | 25 |
Operating income (loss) | 24 |  | (59 | ) | 104 |  | 53 |  | 77 |  | 75 |  | (23 | ) | (103 | ) | 148 |
Finance lease income | — |  | — |  | 9 |  | 49 |  | — |  | — |  | — |  | — |  | 58 |
Gain on sale of assets | — |  | — |  | 262 |  | — |  | — |  | — |  | — |  | — |  | 262 |
Net interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (251 | )
Foreign exchange gain |  |  |  |  |  |  |  |  | 4 |
Earnings before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 221 |
Disclosure of selected consolidated statements of financial position information | Selected Consolidated Statements of Financial Position Information
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 |
Intangible assets | 91 |  | 7 |  | 3 |  | 42 |  | 149 |  | 3 |  | 13 |  | 56 |  | 364 |
As at Dec. 31, 2016 | Canadian Coal |  | US Coal |  | Canadian Gas |  | Australian Gas |  | Wind and Solar |  | Hydro |  | Energy Marketing |  | Corporate |  | Total |
Goodwill | — |  | — |  | — |  | — |  | 175 |  | 259 |  | 30 |  | — |  | 464 |
PP&E | 3,069 |  | 428 |  | 414 |  | 527 |  | 1,856 |  | 503 |  | 2 |  | 25 |  | 6,824 |
Intangibles | 93 |  | 7 |  | 4 |  | 12 |  | 163 |  | 3 |  | 15 |  | 58 |  | 355 |
Disclosure of components in other non-current assets | The components of other assets are as follows:
As at Dec. 31 | 2017 |  | 2016 |
South Hedland prepaid transmission access and distribution | 75 |  | — |
Deferred licence fees | 13 |  | 15 |
Project development costs | 53 |  | 46 |
Deferred service costs | 15 |  | 16 |
Mississauga long-term receivable (Note 4) | — |  | 116 |
Long-term prepaids and other assets | 44 |  | 44 |
Loan receivable | 33 |  | — |
Keephills Unit 3 transmission deposit | 4 |  | 5 |
Total other assets | 237 |  | 242 |
Additions to non-current assets are as follows:
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 |
Intangible assets | 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 |
Year ended Dec. 31, 2015 | Canadian Coal |  | US Coal |  | Canadian Gas |  | Australian Gas |  | Wind and Solar |  | Hydro |  | Energy Marketing |  | Corporate |  | Total |
Additions to non-current assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
PP&E | 179 |  | 13 |  | 19 |  | 204 |  | 13 |  | 43 |  | 1 |  | 4 |  | 476 |
Intangibles | 6 |  | — |  | — |  | — |  | — |  | — |  | 3 |  | 17 |  | 26 |
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 | 2017 |  | 2016 |  | 2015 |
Depreciation and amortization expense on the Consolidated Statements of Earnings (Loss) | 635 |  | 601 |  | 545 |
Depreciation included in fuel and purchased power (Note 5) | 73 |  | 63 |  | 59 |
Loss on disposal of property, plant, and equipment | — |  | — |  | 1 |
Depreciation and amortization on the Consolidated Statements of Cash Flows | 708 |  | 664 |  | 605 |
Disclosure of geographical areas | Revenues
Year ended Dec. 31 | 2017 |  | 2016 |  | 2015 |
Canada | 1,663 |  | 1,828 |  | 1,705 |
US | 509 |  | 450 |  | 448 |
Australia | 135 |  | 119 |  | 114 |
Total revenue | 2,307 |  | 2,397 |  | 2,267 |
II. Non-Current Assets
| Property, plant, and equipment |  | Intangible assets |  | Other assets |  | Goodwill |
As at Dec. 31 | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | 2017 |  | 2016 |
Canada | 5,353 |  | 5,583 |  | 297 |  | 315 |  | 105 |  | 184 |  | 417 |  | 417 |
US | 619 |  | 714 |  | 25 |  | 28 |  | 43 |  | 42 |  | 46 |  | 47 |
Australia | 606 |  | 527 |  | 42 |  | 12 |  | 89 |  | 16 |  | — |  | — |
Total | 6,578 |  | 6,824 |  | 364 |  | 355 |  | 237 |  | 242 |  | 463 |  | 464 |

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