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LEASES (Tables) | 12 Months Ended
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Dec. 31, 2021
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, 2021. 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 $338 million as at December 31, 2021 (2020 - $240 million).
|  | Years ended December 31
(In millions of dollars) |  | 2021 | 2020
Lease liabilities, beginning of year |  | 1,835 |  | 1,725 |
Net additions |  | 386 |  | 320 |
Interest expense on lease liabilities |  | 74 |  | 70 |
Interest payments on lease liabilities |  | (69) |  | (67) |
Principal payments of lease liabilities |  | (269) |  | (213) |
Lease liabilities, end of year |  | 1,957 |  | 1,835 |
Current liability |  | 336 |  | 278 |
Long-term liability |  | 1,621 |  | 1,557 |
Lease liabilities |  | 1,957 |  | 1,835 |

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