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Restructuring (Narrative) (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) Employee | Sep. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges | $ 17 | $ 22 | $ 89 | $ 66
Restructuring and Related Cost, Expected Cost Remaining | 2 | $ 12 | 2 | $ 12
2020 Optimization [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | $ 59 |
Restructuring and Related Cost, Expected Number of Positions Eliminated | Employee |  |  | 3,600 |
Restructuring and Related Cost, Number of Positions Eliminated | Employee |  |  | 3,500 |
Restructuring and Related Cost, Expected Cost Remaining | 7 |  | $ 7 |
Brazil Restructuring [Member] |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring Charges |  |  | $ 2 |
Restructuring and Related Cost, Number of Positions Eliminated | Employee |  |  | 20 |
Restructuring and Related Cost, Expected Cost Remaining | $ 5 |  | $ 5 |

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