Contingencies - Commitments and Letters of Credit (Detail) In Millions, unless otherwise specified	3 Months Ended								3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2013 EUR (€)	Mar. 31, 2013 Line of Credit Facility USD ($)	Mar. 31, 2013 Outside Effective Credit Facility USD ($)	Mar. 31, 2013 Real Estate Investment USD ($)	Mar. 31, 2013 Real Estate Investment EUR (€)	Mar. 31, 2013 Real Estate Investment Upper Limit USD ($)	Mar. 31, 2013 Renovation of Leased Hotel USD ($)	Mar. 31, 2013 Investment in Other Joint Venture Commitment Group 4 Entity	Mar. 31, 2013 Investment in Other Joint Venture Commitment Group 4 Entity	Dec. 28, 2012 Investment in Other Joint Venture Commitment Group 4 USD ($)	Dec. 28, 2012 Investment in Other Joint Venture Commitment Group 4 EUR (€)	Dec. 30, 2011 Investment in Other Joint Venture Commitment Group 4 USD ($)	Dec. 30, 2011 Investment in Other Joint Venture Commitment Group 4 EUR (€)	Mar. 31, 2013 Commitments USD ($)	Mar. 31, 2013 Full Service and Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment USD ($)	Mar. 31, 2013 Full Service and Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment Upper Limit USD ($)	Mar. 31, 2013 Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment USD ($)	Mar. 31, 2013 Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment Upper Limit USD ($)
Commitments and Contingencies Disclosure [Line Items]
Investment commitments																	$ 12		$ 23
Investment commitments expected to be funded by 2015								20								10		20
Investment commitments expected to be funded in 2013							11									3		7
Investment commitments expected to be funded in 2014																6		10
Investment commitments expected to be funded in 2015																1		3
Investment commitments not expected to be funded															33	2		3
Acquisition interests in joint ventures									45.00%	45.00%
Number of new joint ventures									2	2
Ownership interest purchase contingency, term									8 years	8 years
Deposits in conjunction with contingent obligation to acquire the interest in joint ventures											8	6	12	9
Percentage ownership interest acquired from joint venture partner	5.00%	5.00%
Amount of deposit used for contingent joint venture interest acquisition	5	4
Number of years to acquire remaining interest					2 years	2 years
Unfunded purchase commitments					42	33
Purchase commitments expected to be funded by 2015	82
Purchase commitments expected to be funded in 2013	70
Purchase commitments expected to be funded in 2014	7
Purchase commitments expected to be funded in 2015	5
Letters of credit outstanding	68		1	67
Surety bonds issued	$ 125