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financing costs | 12 Months Ended
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Dec. 31, 2020
financing costs |
financing costs | 9 financing costs
Years ended December 31 (millions) |  | Note |  | 2020 |  | 2019
Interest expense |  |  |  |  |  |  |  |
Interest on long-term debt, excluding lease liabilities - gross |  |  |  | $ | 676 |  | $ | 634
Interest on long-term debt, excluding lease liabilities - capitalized 1 |  | 18(a) |  |  | (37) |  |  | (23)
Interest on long-term debt, excluding lease liabilities |  |  |  |  | 639 |  |  | 611
Interest on lease liabilities |  | 19 |  |  | 70 |  |  | 67
Interest on short-term borrowings and other |  |  |  |  | 5 |  |  | 8
Interest accretion on provisions |  | 25 |  |  | 16 |  |  | 22
Long-term debt prepayment premium |  | 26(b) |  |  | 18 |  |  | 28
|  |  |  |  | 748 |  |  | 736
Employee defined benefit plans net interest |  | 15 |  |  | 16 |  |  | 1
Foreign exchange |  |  |  |  | 14 |  |  | 3
|  |  |  |  | 778 |  |  | 740
Interest income |  |  |  |  | (7) |  |  | (7)
|  |  |  | $ | 771 |  | $ | 733
Net interest cost |  | 3 |  | $ | 792 |  | $ | 755
Interest on long-term debt , excluding lease liabilities - capitalized 1 |  |  |  |  | (37) |  |  | (23)
Employee defined benefit plans net interest |  |  |  |  | 16 |  |  | 1
|  |  |  | $ | 771 |  | $ | 733
| 1 |  | Interest on long-term debt, excluding lease liabilities at a composite rate of 4.33% was capitalized to intangible assets with indefinite lives in the periods.

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