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Credit Facilities, Long-Term Debt, and Finance Lease Obligations (Tables) | 12 Months Ended
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Dec. 31, 2017
Subclassifications of assets, liabilities and equities [abstract] |
Disclosure of borrowings outstanding | The amounts outstanding are as follows:
As at Dec. 31 | 2017 | 2016
| Carrying value |  | Face value |  | Interest(1) |  | Carrying value |  | Face value |  | Interest(1) |
Credit facilities(2) | 27 |  | 27 |  | 2.8 | % | — |  | — |  | — | %
Debentures | 1,046 |  | 1,051 |  | 6.0 | % | 1,045 |  | 1,051 |  | 6.0 | %
Senior notes(3) | 1,499 |  | 1,510 |  | 6.0 | % | 2,151 |  | 2,158 |  | 5.0 | %
Non-recourse(4) | 1,022 |  | 1,032 |  | 4.3 | % | 1,038 |  | 1,048 |  | 4.5 | %
Other(5) | 44 |  | 44 |  | 9.2 | % | 54 |  | 54 |  | 9.2 | %
| 3,638 |  | 3,664 |  |  |  | 4,288 |  | 4,311 |  |  |
Finance lease obligations | 69 |  |  |  |  |  | 73 |  |  |  |  |
| 3,707 |  |  |  |  |  | 4,361 |  |  |  |  |
Less: current portion of long-term debt | (729 | ) |  |  |  |  | (623 | ) |  |  |  |
Less: current portion of finance lease obligations | (18 | ) |  |  |  |  | (16 | ) |  |  |  |
Total current long-term debt and finance lease obligations | (747 | ) |  |  |  |  | (639 | ) |  |  |  |
Total credit facilities, long-term debt, and finance lease obligations | 2,960 |  |  |  |  |  | 3,722 |  |  |  |  |
(1) Interest is an average rate weighted by principal amounts outstanding before the effect of hedging. (2) Composed of bankers’ acceptances and other commercial borrowings under long-term committed credit facilities. (3) US face value at Dec. 31, 2017 - US$1.2 billion (Dec. 31, 2016 - US$1.6 billion). (4) Includes US$27 million at Dec. 31, 2017 (Dec. 31, 2016 - US$53 million). (5) Includes US$24 million at Dec. 31, 2017 (Dec. 31, 2016 - US$29 million) of tax equity financing.
Disclosure of principal repayments |
| 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | 2023 and thereafter |  | Total |
Principal repayments(1) | 730 |  | 469 |  | 472 |  | 100 |  | 581 |  | 1,312 |  | 3,664 |
(1) Excludes impact of derivatives.
Disclosure of amounts payable for mining assets and other finance leases | Amounts payable for mining assets and other finance leases are as follows:
As at Dec. 31 | 2017 | 2016
| Minimum lease payments |  | Present value of minimum lease payments |  | Minimum lease payments |  | Present value of minimum lease payments |
Within one year | 20 |  | 20 |  | 19 |  | 19 |
Second to fifth years inclusive | 43 |  | 38 |  | 44 |  | 39 |
More than five years | 15 |  | 11 |  | 21 |  | 15 |
| 78 |  | 69 |  | 84 |  | 73 |
Less: interest costs | 9 |  | — |  | 11 |  | — |
Total finance lease obligations | 69 |  | 69 |  | 73 |  | 73 |
Included in the Consolidated Statements of Financial Position as: |  |  |  |  |  |
Current portion of finance lease obligations | 18 |  |  |  | 16 |  |  |
Long-term portion of finance lease obligations | 51 |  |  |  | 57 |  |  |
| 69 |  |  |  | 73 |  |  |

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