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RIGHT-OF-USE ASSETS AND LEASES | 12 Months Ended
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Dec. 31, 2021
RIGHT-OF-USE ASSETS AND LEASES |
RIGHT-OF-USE ASSETS AND LEASES | 17. RIGHT-OF-USE ASSETS AND LEASES Right-of-use (ROU) assets within Property, Plant and Equipment: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31 | ​ | December 31 | ​
($ millions) |  | 2021 | ​ | 2020 |
Property, plant and equipment, net – excluding ROU assets |  | 62 821 | ​ | 65 306 | ​
ROU assets | ​ | 2 725 | ​ | 2 824 | ​
​ |  | 65 546 | ​ | 68 130 | ​
The following table presents the ROU assets by asset class:
​ | ​ | ​ | ​
​ | ​ | Plant and | ​
($ millions) | ​ | Equipment | ​
Cost | ​ | ​ | ​
At January 1, 2020 | ​ | 3 505 | ​
Additions and adjustments | ​ | 312 | ​
Disposals | ​ | (25) | ​
Foreign exchange | ​ | (6) | ​
At December 31, 2020 | ​ | 3 786 | ​
Additions and adjustments | ​ | 307 | ​
Disposals | ​ | (232) | ​
Foreign exchange | ​ | - | ​
At December 31, 2021 | ​ | 3 861 | ​
​ | ​ | ​ | ​
Accumulated provision | ​ | ​ | ​
At January 1, 2020 | ​ | (610) | ​
Depreciation | ​ | (375) | ​
Disposals | ​ | 21 | ​
Foreign exchange | ​ | 2 | ​
At December 31, 2020 | ​ | (962) | ​
Depreciation | ​ | (396) | ​
Disposals | ​ | 221 | ​
Foreign exchange | ​ | 1 | ​
At December 31, 2021 | ​ | (1 136) | ​
​ | ​ | ​ | ​
Net ROU assets | ​ | ​ | ​
At December 31, 2020 | ​ | 2 824 | ​
At December 31, 2021 | ​ | 2 725 | ​
​ | ​ | ​ | ​
​ Other lease-related items recognized in the Consolidated Statements of Comprehensive Income (Loss): ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended December 31 | ​
($ millions) |  | 2021 | ​ | 2020 |
Operating, selling and general |  | ​ | ​ | ​ | ​
Short-term lease expense |  | 143 | ​ | 181 | ​
Variable lease expense | ​ | 35 | ​ | 39 | ​
​ There were no leases with residual value guarantees. For the year ended December 31, 2021, total cash outflow for leases, excluding short-term lease expense and variable lease expense, was $486 million (2020 – $501 million). ​

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