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Restructuring and Impairment Charges - Charges (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) segment | Sep. 30, 2018 USD ($) | Dec. 31, 2020 USD ($)
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | $ 28 | $ 34 | $ 41 | $ 45 |
Number of reportable business segments | segment |  |  |  | 4 |  |
Cost Smart Cost of Sales Program |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 14 |  | $ 18 |  |
Cost Smart Cost of Sales Program | Accelerated depreciation |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  | 28 |  | 28 |
Cost Smart Cost of Sales Program | Employee-related severance costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  | 3 |  | 3 |
Cost Smart Cost of Sales Program, Production facility closure, Australia |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 6 |  | 6 |  |
Cost Smart Cost of Sales Program, Production facility closure, Australia | Forecast |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges | $ 10 |  |  |  |  |
Cost Smart Cost of Sales Program, Production facility closure, Australia | Forecast | Minimum |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 10
Cost Smart Cost of Sales Program, Production facility closure, Australia | Forecast | Maximum |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 12
Cost Smart Cost of Sales Program, Production facility closure, Australia | Accelerated depreciation |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 2 |  | 2 |  |
Cost Smart Cost of Sales Program, Production facility closure, Australia | Employee-related severance costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 4 |  | 4 |  |
Cost Smart Cost of Sales Program, South America | Employee-related severance costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 4 |  | 4 |  |
Cost Smart Cost of Sales Program, North America |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 4 |  | 8 |  |
Cost Smart Cost of Sales Program, North America | Cessation of wet-milling |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  |  | 2 |  |
Expected additional costs |  | 0 |  | 0 |  |
Cost Smart SG&A Program |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 14 |  | 23 |  |
Cost Smart SG&A Program | Employee-related severance costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 6 |  | 12 |  |
Cost Smart SG&A Program | Other restructuring costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | 8 |  | 11 |  |
Cost Smart SG&A Program, Latin American Finance Transformation Initiative | Employee-related severance and other costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  | $ 3 |  | 4 |
Cost Smart SG&A Program, Latin American Finance Transformation Initiative | Other restructuring costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  | $ 1 |  | $ 2 |  |
Cost Smart SG&A Program, North and South America | Employee-related severance costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  |  |  | 5 |
North America Finance Transformation Initiative | Other restructuring costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  |  |  | 4 |
Brazil leaf extraction Process restructuring | Other restructuring costs |  |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |  |
Restructuring charges |  |  |  |  | $ 1 |

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