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Restructuring and Impairment Charges - Charges (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2020 | Jun. 30, 2020 | Jun. 30, 2019
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  | $ 9 |  |  | $ 13
Cost Smart cost of sales and SG&A Program |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | $ 11 |  |  | $ 25 |
Cost Smart cost of sales and SG&A Program | Employee-related severance costs |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  |  |  | 3 |
Cost Smart Cost of Sales Program |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | 6 | 3 |  | 15 | 4
Cost Smart Cost of Sales Program | Cessation of wet-milling |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  | 1 |  |  | 2
Cost Smart Cost of Sales Program, Production facility closure, Australia | Forecast |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  |  | $ 2 |  |
Cost Smart Cost of Sales Program, Production facility closure, Australia | Asset write-off |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | 3 |  |  | 6 |
Cost Smart Cost of Sales Program, Production facility closure, Australia | Accelerated depreciation |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  |  |  | 1 |
Cost Smart Cost of Sales Program, Production facility closure, Australia | Other restructuring costs |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | 1 |  |  | 2 |
Cost Smart Cost of Sales Program, North America | Accelerated depreciation |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | 1 |  |  | 4 |
Cost Smart Cost of Sales Program, North America | Employee-related severance costs |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | 1 |  |  | 1 |
Cost Smart Cost of Sales Program, North America | Other restructuring costs |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  |  |  | 1 |
Cost Smart SG&A Program |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | 5 |  |  | 10 |
Cost Smart SG&A Program | Employee-related severance costs |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  |  |  | 2 |
Cost Smart SG&A Program | Employee-related severance and other costs |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  | 6 |  |  | 9
Cost Smart SG&A Program | Other restructuring costs |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges |  |  |  | $ 8 |
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 America |  |  |  |  |
Restructuring and impairment charges |  |  |  |  |
Restructuring charges | $ 5 |  |  |  |

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