Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Goodwill [Line Items]
Goodwill	$ 997	$ 948
Accumulated impairment losses	(54)	(54)
Goodwill	943	894
Additions	19
Adjustments	57
Foreign currency translation	(27)
North American Full-Service Segment
Goodwill [Line Items]
Goodwill	409	392
Accumulated impairment losses	0	0
Goodwill	409	392
North American Limited-Service Segment
Goodwill [Line Items]
Goodwill	125	125
Accumulated impairment losses	(54)	(54)
Goodwill	71	71
International
Goodwill [Line Items]
Goodwill	463	431
Accumulated impairment losses	0	0
Goodwill	463	$ 431
Operating Segments | North American Full-Service Segment
Goodwill [Line Items]
Additions	19
Adjustments	0
Foreign currency translation	(2)
Operating Segments | North American Limited-Service Segment
Goodwill [Line Items]
Additions	0
Adjustments	0
Foreign currency translation	0
Operating Segments | International
Goodwill [Line Items]
Additions	0
Adjustments	57
Foreign currency translation	$ (25)