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RIGHT-OF-USE ASSETS AND LEASES | 12 Months Ended
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Dec. 31, 2020
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:
($ millions) |  | December 31 2020 |  | December 31 2019 |
Property, plant and equipment, net – excluding ROU assets |  | 65 306 |  | 69 745 |
ROU assets |  | 2 824 |  | 2 895 |
|  | 68 130 |  | 72 640 |
The following table presents the ROU assets by asset class:
($ millions) |  | Plant and Equipment |  |
Cost |  |  |  |
At January 1, 2019 |  | 3 326 |  |
Additions and adjustments |  | 186 |  |
Foreign exchange |  | (7 | ) |
At December 31, 2019 |  | 3 505 |  |
Additions and adjustments |  | 312 |  |
Disposals |  | (25 | ) |
Foreign exchange |  | (6 | ) |
At December 31, 2020 |  | 3 786 |  |
Accumulated provision |  |  |  |
At January 1, 2019 |  | (267 | ) |
Depreciation |  | (343 | ) |
At December 31, 2019 |  | (610 | ) |
Depreciation |  | (375 | ) |
Disposals |  | 21 |  |
Foreign exchange |  | 2 |  |
At December 31, 2020 |  | (962 | ) |
Net ROU assets |  |  |  |
At December 31, 2019 |  | 2 895 |  |
At December 31, 2020 |  | 2 824 |  |
Other lease-related items recognized in the Consolidated Statements of Comprehensive (Loss) Income:
|  | For the year ended December 31 |
($ millions) |  | 2020 |  | 2019 |
Operating, selling and general |  |  |  |  |
| Short-term lease expense |  | 181 |  | 236 |
| Variable lease expense |  | 39 |  | 45 |
There were no leases with residual value guarantees. For the year ended December 31, 2020, total cash outflow for leases, excluding short-term lease expense and variable lease expense, was $501 million (2019 – $464 million).

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