Schedule of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Gross goodwill			$ 3,191
Goodwill [Roll Forward]
Goodwill	$ 1,092	$ 1,073
Goodwill, Impaired, Accumulated Impairment Loss			(2,118)
Acquisition	21	54
Adjustments to the allocation of purchase price	(12)	(35)
Goodwill	1,101	1,092
Americas
Goodwill [Line Items]
Gross goodwill			2,139
Goodwill [Roll Forward]
Goodwill	539	552
Goodwill, Impaired, Accumulated Impairment Loss			1,587
Acquisition	21	0
Adjustments to the allocation of purchase price	(6)	(13)
Goodwill	554	539
International
Goodwill [Line Items]
Gross goodwill			1,052
Goodwill [Roll Forward]
Goodwill	553	521
Goodwill, Impaired, Accumulated Impairment Loss			$ 531
Acquisition	0	54
Adjustments to the allocation of purchase price	(6)	(22)
Goodwill	$ 547	$ 553