Contingencies - Commitments and Letters of Credit (Detail) In Millions, unless otherwise specified	3 Months Ended										6 Months Ended											3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2013 EUR (€)	Jun. 30, 2013 USD ($)	Jun. 30, 2013 Line of Credit Facility USD ($)	Jun. 30, 2013 Outside Effective Credit Facility USD ($)	Jun. 30, 2013 Real Estate Investment USD ($)	Jun. 30, 2013 Real Estate Investment EUR (€)	Jun. 30, 2013 Real Estate Investment Upper Limit USD ($)	Jun. 30, 2013 Information Technology Hardware, Software, and Maintenance Services USD ($)	Jun. 30, 2013 Renovation of Leased Hotel USD ($)	Jun. 30, 2013 Investment in Other Joint Venture Commitment Group 4 Entity	Jun. 30, 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 (€)	Jun. 30, 2013 Commitments USD ($)	Jun. 30, 2013 Full Service and Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment USD ($)	Jun. 30, 2013 Full Service and Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment Upper Limit USD ($)	Jun. 30, 2013 Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment USD ($)	Jun. 30, 2013 Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment Upper Limit USD ($)	Jun. 30, 2013 Debt Securities Mandatorily Redeemable Preferred Equity Ownership Interest USD ($) Entity
Commitments and Contingencies Disclosure [Line Items]
Investment commitments																			$ 10		$ 23	$ 10
Investment commitments expected to be funded by 2015										20								9		23
Investment commitments expected to be funded in 2013								11												5
Investment commitments expected to be funded in 2014						8												8		13
Investment commitments expected to be funded in 2015						3												1		5
Investment commitments not expected to be funded																	33	1
Number of hotels included in investment commitments																						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						1 year	1 year
Purchase commitments									63
Purchase commitments expected to be funded in 2013									51
Purchase commitments expected to be funded in 2014						43	33		7
Purchase commitments expected to be funded in 2015									5
Letters of credit outstanding			68	1	67
Surety bonds issued			$ 126