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Asset Impairment, Exit and Implementation Costs (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | $ 1 |  | $ 5 | $ 395 | $ 111 |
Wine Business Strategic Reset [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges | $ 1 |  |  | $ 395 |  |
Inventory Write-Off [Member] | Wine Business Strategic Reset [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  | $ 292 |  |  |  |
Purchase Commitment [Member] | Wine Business Strategic Reset [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  | $ 100 |  |  |  |
Fulfillment term |  |  |  | 5 years |  |
Forecast [Member] | Wine Business Strategic Reset [Member] |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |
Restructuring charges |  |  |  |  |  | $ 20

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