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Restructuring and Other Related Charges (Summary Of Changes To Restructuring-Related Liabilities) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2021 |  |  | $ 9 |
Restructuring expenses | $ 5 | $ 17 | 47 | $ 89
Balance as of September 30, 2021 | 5 |  | 5 |
Americas |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2021 |  |  | 3 |
Balance as of September 30, 2021 | 1 |  | 1 |
International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2021 |  |  | 6 |
Balance as of September 30, 2021 | 4 |  | 4 |
T21 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 16 |
Restructuring payment/utilization: |  |  | (15) |
T21 | Americas |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 3 |
Restructuring payment/utilization: |  |  | (3) |
T21 | International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 13 |
Restructuring payment/utilization: |  |  | (12) |
2020 Optimization Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring payment/utilization: |  |  | (5) |
2020 Optimization Plan | Americas |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring payment/utilization: |  |  | (2) |
2020 Optimization Plan | International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring payment/utilization: |  |  | (3) |
T19 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | (2) |
Restructuring payment/utilization: |  |  | 2 |
T19 | Americas |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | (2) |
Restructuring payment/utilization: |  |  | 2 |
T19 | International |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 0 |
Restructuring payment/utilization: |  |  | 0 |
Personnel |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2021 |  |  | 4 |
Balance as of September 30, 2021 | 1 |  | 1 |
Personnel | T21 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 13 |
Restructuring payment/utilization: |  |  | (10) |
Personnel | 2020 Optimization Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring payment/utilization: |  |  | (5) |
Personnel | T19 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 0 |
Restructuring payment/utilization: |  |  | (1) |
Facility Related |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2021 |  |  | 2 |
Balance as of September 30, 2021 | 1 |  | 1 |
Facility Related | T21 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 2 |
Restructuring payment/utilization: |  |  | (3) |
Facility Related | 2020 Optimization Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring payment/utilization: |  |  | 0 |
Facility Related | T19 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 0 |
Restructuring payment/utilization: |  |  | 0 |
Other |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Balance as of January 1, 2021 |  |  | 3 |
Balance as of September 30, 2021 | $ 3 |  | 3 |
Other | T21 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | 1 |
Restructuring payment/utilization: |  |  | (2) |
Other | 2020 Optimization Plan |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring payment/utilization: |  |  | 0 |
Other | T19 |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |
Restructuring expenses |  |  | (2) |
Restructuring payment/utilization: |  |  | $ 3 |

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