Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	$ 6
Restructuring expense	(44)	$ (21)
Balance as of March 31, 2020	25
Americas
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	2
Balance as of March 31, 2020	14
International [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	4
Balance as of March 31, 2020	11
2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	(26)
Payment for Restructuring	(3)
2020 Optimization [Member] | Americas
Restructuring Reserve [Roll Forward]
Restructuring expense	(15)
Payment for Restructuring	(1)
2020 Optimization [Member] | International [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	(11)
Payment for Restructuring	(2)
Brazil Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	(1)
Payment for Restructuring	(1)
Brazil Restructuring [Member] | Americas
Restructuring Reserve [Roll Forward]
Restructuring expense	(1)
Payment for Restructuring	(1)
Brazil Restructuring [Member] | International [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	0
Payment for Restructuring	0
T19 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(4)
T19 Restructuring [Member] | Americas
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(2)
T19 Restructuring [Member] | International [Member]
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(2)
Personnel
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	3
Balance as of March 31, 2020	20
Personnel | 2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	(24)
Payment for Restructuring	(3)
Personnel | Brazil Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	(1)
Payment for Restructuring	(1)
Personnel | T19 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Payment for Restructuring	(4)
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	1
Balance as of March 31, 2020	3
Facility Closing [Member] | 2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	(2)
Payment for Restructuring	0
Facility Closing [Member] | Brazil Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	0
Payment for Restructuring	0
Facility Closing [Member] | T19 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Payment for Restructuring	0
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020	2
Balance as of March 31, 2020	2
Other Restructuring [Member] | 2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	0
Payment for Restructuring	0
Other Restructuring [Member] | Brazil Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense	0
Payment for Restructuring	0
Other Restructuring [Member] | T19 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Payment for Restructuring	$ 0