Restructuring (Summary Of Changes To Restructuring-Related Liabilities) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			$ 6
Restructuring expense	$ (28)	$ (23)	(72)	$ (44)
Balance as of June 30, 2020	11		11
Americas
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			2
Balance as of June 30, 2020	4		4
International [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			4
Balance as of June 30, 2020	7		7
2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(47)
Payment for Restructuring			(36)
2020 Optimization [Member] | Americas
Restructuring Reserve [Roll Forward]
Restructuring expense			(24)
Payment for Restructuring			(19)
2020 Optimization [Member] | International [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(23)
Payment for Restructuring			(17)
Brazil Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(1)
Payment for Restructuring			(2)
Brazil Restructuring [Member] | Americas
Restructuring Reserve [Roll Forward]
Restructuring expense			(1)
Payment for Restructuring			(2)
Brazil Restructuring [Member] | International [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			0
Payment for Restructuring			0
T19 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(4)
Payment for Restructuring			(9)
T19 Restructuring [Member] | Americas
Restructuring Reserve [Roll Forward]
Restructuring expense			(4)
Payment for Restructuring			(6)
T19 Restructuring [Member] | International [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			0
Payment for Restructuring			(3)
Personnel
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			3
Balance as of June 30, 2020	8		8
Personnel | 2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(44)
Payment for Restructuring			(35)
Personnel | Brazil Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(1)
Payment for Restructuring			(1)
Personnel | T19 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			0
Payment for Restructuring			(4)
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			1
Balance as of June 30, 2020	1		1
Facility Closing [Member] | 2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(1)
Payment for Restructuring			0
Facility Closing [Member] | Brazil Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			0
Payment for Restructuring			(1)
Facility Closing [Member] | T19 Restructuring [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			0
Payment for Restructuring			0
Other Restructuring [Member]
Restructuring Reserve [Roll Forward]
Balance as of January 1, 2020			2
Balance as of June 30, 2020	$ 2		2
Other Restructuring [Member] | 2020 Optimization [Member]
Restructuring Reserve [Roll Forward]
Restructuring expense			(2)
Payment for Restructuring			(1)
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]
Restructuring expense			(4)
Payment for Restructuring			$ (5)