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Financing (Income) Expenses (Tables) | 12 Months Ended
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Dec. 31, 2018
FINANCING (INCOME) EXPENSES |
Financing expenses disclosure |
($ millions) |  | 2018 |  | 2017 |  |
Interest on debt and finance leases |  | 897 |  | 945 |  |
Capitalized interest at 5.4% (2017 – 5.5%) |  | (156 | ) | (729 | ) |
| Interest expense |  | 741 |  | 216 |  |
| Interest on partnership liability (note 35) |  | 56 |  | 5 |  |
| Interest on pension and other post-retirement benefits |  | 56 |  | 58 |  |
| Accretion |  | 266 |  | 247 |  |
| Foreign exchange loss (gain) on U.S. dollar denominated debt |  | 1 090 |  | (771 | ) |
| Foreign exchange and other |  | (70 | ) | (52 | ) |
| Loss on extinguishment of long-term debt |  | 3 |  | 113 |  |
| Realized gain on foreign currency hedges |  | — |  | (62 | ) |
|  | 2 142 |  | (246 | ) |

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