Restructuring and Other Related Charges (Summary Of Changes To Restructuring-Related Liabilities) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	$ 10
Restructuring expenses	8	$ 20
Balance at the end of the period	6
Personnel
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	7
Balance at the end of the period	4
Facility Related
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	2
Balance at the end of the period	1
Other
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	1
Balance at the end of the period	1
Americas
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	2
Balance at the end of the period	2
International
Restructuring Reserve [Roll Forward]
Balance at the beginning of the period	8
Balance at the end of the period	4
T21
Restructuring Reserve [Roll Forward]
Restructuring expenses	3
Restructuring payment/utilization:	(7)
T21 | Personnel
Restructuring Reserve [Roll Forward]
Restructuring expenses	3
Restructuring payment/utilization:	(6)
T21 | Facility Related
Restructuring Reserve [Roll Forward]
Restructuring expenses	0
Restructuring payment/utilization:	(1)
T21 | Other
Restructuring Reserve [Roll Forward]
Restructuring expenses	0
Restructuring payment/utilization:	0
T21 | Americas
Restructuring Reserve [Roll Forward]
Restructuring expenses	1
Restructuring payment/utilization:	(1)
T21 | International
Restructuring Reserve [Roll Forward]
Restructuring expenses	2
Restructuring payment/utilization:	$ (6)