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Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Detailed Information About Borrowings |
($ in millions) |  | December 31, 2018 |  |  | December 31, 2017 |
|  | Face |  |  | Carrying |  |  | Fair |  |  | Face |  |  | Carrying |  |  | Fair |
|  | Value |  |  | Value |  |  | Value |  |  | Value |  |  | Value |  |  | Value |
|  | (US$) |  |  | (CAD$) |  |  | (CAD$) |  |  | (US$) |  |  | (CAD$) |  |  | (CAD$) |
2.5% notes due February 2018 |  | $ | – |  |  | $ | – |  |  | $ | – |  |  | $ | 22 |  |  | $ | 28 |  |  | $ | 28 |
4.5% notes due January 2021 (a)(b) |  |  | 117 |  |  |  | 159 |  |  |  | 159 |  |  |  | 220 |  |  |  | 274 |  |  |  | 285 |
4.75% notes due January 2022 (a)(b) |  |  | 202 |  |  |  | 275 |  |  |  | 275 |  |  |  | 672 |  |  |  | 841 |  |  |  | 884 |
3.75% notes due February 2023 (a)(b) |  |  | 220 |  |  |  | 295 |  |  |  | 286 |  |  |  | 646 |  |  |  | 804 |  |  |  | 818 |
8.5% notes due June 2024 |  |  | 600 |  |  |  | 819 |  |  |  | 883 |  |  |  | 600 |  |  |  | 753 |  |  |  | 853 |
6.125% notes due October 2035 |  |  | 609 |  |  |  | 818 |  |  |  | 802 |  |  |  | 609 |  |  |  | 751 |  |  |  | 865 |
6.0% notes due August 2040 |  |  | 490 |  |  |  | 666 |  |  |  | 621 |  |  |  | 491 |  |  |  | 613 |  |  |  | 686 |
6.25% notes due July 2041 |  |  | 795 |  |  |  | 1,072 |  |  |  | 1,031 |  |  |  | 795 |  |  |  | 986 |  |  |  | 1,144 |
5.2% notes due March 2042 |  |  | 399 |  |  |  | 537 |  |  |  | 465 |  |  |  | 399 |  |  |  | 494 |  |  |  | 502 |
5.4% notes due February 2043 |  |  | 377 |  |  |  | 509 |  |  |  | 449 |  |  |  | 377 |  |  |  | 468 |  |  |  | 481 |
|  |  | 3,809 |  |  |  | 5,150 |  |  |  | 4,971 |  |  |  | 4,831 |  |  |  | 6,012 |  |  |  | 6,546 |
Antamina term loan due April 2020 |  |  | 23 |  |  |  | 31 |  |  |  | 31 |  |  |  | 23 |  |  |  | 28 |  |  |  | 28 |
Finance lease liabilities (c) |  |  | 248 |  |  |  | 338 |  |  |  | 338 |  |  |  | 250 |  |  |  | 313 |  |  |  | 313 |
Other |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 13 |  |  |  | 16 |  |  |  | 16 |
|  |  | 4,080 |  |  |  | 5,519 |  |  |  | 5,340 |  |  |  | 5,117 |  |  |  | 6,369 |  |  |  | 6,903 |
Less current portion of debt |  |  | (24 | ) |  |  | (32 | ) |  |  | (32 | ) |  |  | (45 | ) |  |  | (55 | ) |  |  | (55 | )
|  | $ | 4,056 |  |  | $ | 5,487 |  |  | $ | 5,308 |  |  | $ | 5,072 |  |  | $ | 6,314 |  |  | $ | 6,848 |
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, 2018 |  |  | December 31, 2017 |
Undiscounted minimum finance lease payments: |  |  |  |  |  |  |  |
Less than one year |  | $ | 50 |  |  | $ | 51 |
One to five years |  |  | 147 |  |  |  | 134 |
Thereafter |  |  | 556 |  |  |  | 554 |
|  |  | 753 |  |  |  | 739 |
Effect of discounting |  |  | (415 | ) |  |  | (426 | )
Present value of minimum finance lease payments – total finance lease liabilities |  |  | 338 |  |  |  | 313 |
Less current portion |  |  | (32 | ) |  |  | (27 | )
Long-term finance lease liabilities |  | $ | 306 |  |  | $ | 286 |
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, 2018 |  |  | December 31, 2017 |
Less than one year |  | $ | 46 |  |  | $ | 48 |
One to five years |  |  | 114 |  |  |  | 106 |
Thereafter |  |  | 178 |  |  |  | 159 |
Total |  | $ | 338 |  |  | $ | 313 |
Scheduled Principal Payments | At December 31, 2018, the scheduled principal payments excluding finance lease liabilities (c), during the next five years and thereafter are as follows:
($ in millions) |  | US$ |  |  | CAD$ Equivalent |
2019 |  | $ | — |  |  | $ | — |
2020 |  |  | 23 |  |  |  | 31 |
2021 |  |  | 117 |  |  |  | 159 |
2022 |  |  | 202 |  |  |  | 275 |
2023 |  |  | 220 |  |  |  | 300 |
Thereafter |  |  | 3,270 |  |  |  | 4,462 |
|  | $ | 3,832 |  |  | $ | 5,227 |
Summary of Debt Continuity |
g) | Debt Continuity
($ in millions) |  | US$ |  |  | CAD$ Equivalent |
|  | 2018 |  |  | 2017 |  |  | 2018 |  |  | 2017 |
As at January 1 |  | $ | 5,077 |  |  | $ | 6,213 |  |  | $ | 6,369 |  |  | $ | 8,343 |
Cash flows |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Scheduled debt repayments |  |  | (22 | ) |  |  | (49 | ) |  |  | (28 | ) |  |  | (64 | )
Debt repurchases |  |  | (1,015 | ) |  |  | (1,356 | ) |  |  | (1,328 | ) |  |  | (1,831 | )
Finance lease payments (c) |  |  | (42 | ) |  |  | (26 | ) |  |  | (54 | ) |  |  | (34 | )
Non-cash changes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on debt repurchases (a)(b) |  |  | 20 |  |  |  | 105 |  |  |  | 26 |  |  |  | 141 |
Changes in foreign exchange rates |  |  | (20 | ) |  |  | — |  |  |  | 472 |  |  |  | (424 | )
Finance lease liabilities (c) |  |  | 60 |  |  |  | 187 |  |  |  | 78 |  |  |  | 234 |
Finance fees and discount amortization |  |  | — |  |  |  | 3 |  |  |  | 1 |  |  |  | 4 |
Other |  |  | (12 | ) |  |  | — |  |  |  | (17 | ) |  |  | — |
As at December 31 |  | $ | 4,046 |  |  | $ | 5,077 |  |  | $ | 5,519 |  |  | $ | 6,369 |

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