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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2019
Inventories [Abstract] |
Disclosure of details of inventories |
($ millions) |  | 2019 |  |  | 2018 |
Raw material, consumables |  | 286 |  |  | 334 |
Work in progress |  | 101 |  |  | 127 |
Finished products |  | 1,118 |  |  | 979 |
Total inventories |  | 1,505 |  |  | 1,440 |

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