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Debt (Tables) | 12 Months Ended
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Dec. 31, 2017
Text block1 [abstract] |
Summary of Detailed Information About Borrowings |
|  | December 31, 2017 |  |  | December 31, 2016 |
($ in millions) |  | Face Value (US$) |  |  | Carrying Value (CAD$) |  |  | Fair Value (CAD$) |  |  | Face Value (US$) |  |  | Carrying Value (CAD$) |  |  | Fair Value (CAD$) |
3.15% notes due January 2017 |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 34 |  |  | $ | 45 |  |  | $ | 45 |
3.85% notes due August 2017 |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 16 |  |  |  | 21 |  |  |  | 21 |
2.5% notes due February 2018 |  |  | 22 |  |  |  | 28 |  |  |  | 28 |  |  |  | 22 |  |  |  | 30 |  |  |  | 30 |
3.0% notes due March 2019 (a) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 278 |  |  |  | 372 |  |  |  | 375 |
4.5% notes due January 2021 (a) |  |  | 220 |  |  |  | 274 |  |  |  | 285 |  |  |  | 500 |  |  |  | 668 |  |  |  | 685 |
8.0% notes due June 2021 (a)(b) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 650 |  |  |  | 866 |  |  |  | 963 |
4.75% notes due January 2022 (a) |  |  | 672 |  |  |  | 841 |  |  |  | 884 |  |  |  | 700 |  |  |  | 936 |  |  |  | 951 |
3.75% notes due February 2023 (a)(b) |  |  | 646 |  |  |  | 804 |  |  |  | 818 |  |  |  | 670 |  |  |  | 891 |  |  |  | 858 |
8.5% notes due June 2024 (b) |  |  | 600 |  |  |  | 753 |  |  |  | 853 |  |  |  | 600 |  |  |  | 806 |  |  |  | 935 |
6.125% notes due October 2035 (b) |  |  | 609 |  |  |  | 751 |  |  |  | 865 |  |  |  | 609 |  |  |  | 804 |  |  |  | 801 |
6.0% notes due August 2040 (b) |  |  | 491 |  |  |  | 613 |  |  |  | 686 |  |  |  | 491 |  |  |  | 658 |  |  |  | 623 |
6.25% notes due July 2041 (b) |  |  | 795 |  |  |  | 986 |  |  |  | 1,144 |  |  |  | 795 |  |  |  | 1,055 |  |  |  | 1,043 |
5.2% notes due March 2042 (b) |  |  | 399 |  |  |  | 494 |  |  |  | 502 |  |  |  | 399 |  |  |  | 528 |  |  |  | 477 |
5.4% notes due February 2043 (b) |  |  | 377 |  |  |  | 468 |  |  |  | 481 |  |  |  | 377 |  |  |  | 500 |  |  |  | 450 |
|  |  | 4,831 |  |  |  | 6,012 |  |  |  | 6,546 |  |  |  | 6,141 |  |  |  | 8,180 |  |  |  | 8,257 |
Antamina term loan due April 2020 |  |  | 23 |  |  |  | 28 |  |  |  | 28 |  |  |  | 23 |  |  |  | 30 |  |  |  | 30 |
Finance lease liabilities (c) |  |  | 250 |  |  |  | 313 |  |  |  | 313 |  |  |  | 86 |  |  |  | 115 |  |  |  | 115 |
Other |  |  | 13 |  |  |  | 16 |  |  |  | 16 |  |  |  | 13 |  |  |  | 18 |  |  |  | 18 |
|  |  | 5,117 |  |  |  | 6,369 |  |  |  | 6,903 |  |  |  | 6,263 |  |  |  | 8,343 |  |  |  | 8,420 |
Less current portion of debt |  |  | (45 | ) |  |  | (55 | ) |  |  | (55 | ) |  |  | (74 | ) |  |  | (99 | ) |  |  | (99 | )
|  | $ | 5,072 |  |  | $ | 6,314 |  |  | $ | 6,848 |  |  | $ | 6,189 |  |  | $ | 8,244 |  |  | $ | 8,321 |
Summary of Minimum Lease Payments of Finance Lease Liabilities and Effect of Discounting | Minimum lease payments in respect of finance lease liabilities and the effect of discounting are as follows:
(CAD$ in millions) |  | December 31, 2017 |  |  | December 31, 2016 |
Undiscounted minimum finance lease payments: |  |  |  |  |  |  |  |
Less than one year |  | $ | 51 |  |  | $ | 34 |
One to five years |  |  | 134 |  |  |  | 43 |
Thereafter |  |  | 554 |  |  |  | 62 |
|  |  | 739 |  |  |  | 139 |
Effect of discounting |  |  | (426 | ) |  |  | (24 | )
Present value of minimum finance lease payments — total finance lease liabilities |  |  | 313 |  |  |  | 115 |
Less current portion |  |  | (27 | ) |  |  | (33 | )
Long-term finance lease liabilities |  | $ | 286 |  |  | $ | 82 |
Summary of Present Value of Finance Lease Liabilities and Their Expected Timing of Payment | The present value of finance lease liabilities and their expected timing of payment are as follows:
(CAD$ in millions) |  | December 31, 2017 |  |  | December 31, 2016 |
Less than one year |  | $ | 48 |  |  | $ | 34 |
One to five years |  |  | 106 |  |  |  | 39 |
Thereafter |  |  | 159 |  |  |  | 42 |
Total |  | $ | 313 |  |  | $ | 115 |
Scheduled Principal Payments | At December 31, 2017, the scheduled principal payments excluding finance lease liabilities (c), during the next five years and thereafter are as follows:
($ in millions) |  | US$ |  |  | CAD$ Equivalent |
2018 |  | $ | 22 |  |  | $ | 28 |
2019 |  |  | — |  |  |  | — |
2020 |  |  | 23 |  |  |  | 28 |
2021 |  |  | 220 |  |  |  | 275 |
2022 |  |  | 672 |  |  |  | 844 |
Thereafter |  |  | 3,930 |  |  |  | 4,930 |
|  | $ | 4,867 |  |  | $ | 6,105 |
Summary of Debt Continuity |
g) | Debt Continuity
|  | US$ |  |  | CAD$ Equivalent |
($ in millions) |  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
As at January 1 |  | $ | 6,213 |  |  | $ | 6,961 |  |  | $ | 8,343 |  |  | $ | 9,634 |
Cash flows |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  | — |  |  |  | 1,227 |  |  |  | — |  |  |  | 1,567 |
Scheduled debt repayments |  |  | (49 | ) |  |  | — |  |  |  | (64 | ) |  |  | — |
Debt repurchases |  |  | (1,356 | ) |  |  | (1,960 | ) |  |  | (1,831 | ) |  |  | (2,531 | )
Finance lease payments (c) |  |  | (26 | ) |  |  | (22 | ) |  |  | (34 | ) |  |  | (29 | )
Non-cash changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issuance of debt |  |  | — |  |  |  | 17 |  |  |  | — |  |  |  | 22 |
Loss (gain) on debt repurchases (a)(b) |  |  | 105 |  |  |  | (37 | ) |  |  | 141 |  |  |  | (49 | )
Changes in foreign exchange rates |  |  | — |  |  |  | — |  |  |  | (424 | ) |  |  | (308 | )
Finance lease liabilities (c) |  |  | 187 |  |  |  | 21 |  |  |  | 234 |  |  |  | 28 |
Finance fees and discount amortization |  |  | 3 |  |  |  | 6 |  |  |  | 4 |  |  |  | 9 |
As at December 31 |  | $ | 5,077 |  |  | $ | 6,213 |  |  | $ | 6,369 |  |  | $ | 8,343 |

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