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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2020
Disclosure of leases [Abstract] |
Summary of activity related to lease liabilities | Below is a summary of the activity related to our lease liabilities for the twelve months ended December 31, 2020. Certain of our lease liabilities are secured by the underlying right-of-use assets; the underlying right-of-use assets have a net carrying amount of $240 million as at December 31, 2020 (2019 - $114 million).
|  | Years ended December 31
(In millions of dollars) |  | 2020 | 2019
Lease liabilities, beginning of year |  | 1,725 |  | 1,545 |
Net additions |  | 320 |  | 335 |
Interest expense on lease liabilities |  | 70 |  | 61 |
Interest payments on lease liabilities |  | (67) |  | (49) |
Principal payments of lease liabilities |  | (213) |  | (167) |
Lease liabilities, end of year |  | 1,835 |  | 1,725 |
Current liability |  | 278 |  | 230 |
Long-term liability |  | 1,557 |  | 1,495 |
Lease liabilities |  | 1,835 |  | 1,725 |

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