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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2020
Inventories [Abstract] |
Disclosure of details of inventories |
($ millions) | 2020 | 2019 |  |
Raw material, consumables | 278 |  | 286 |  |  |
Work in progress | 136 |  | 101 |  |  |
Finished products | 1,230 |  | 1,118 |  |  |
Total inventories | 1,644 |  | 1,505 |  |  |

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