Contingencies - Commitments and Letters of Credit (Detail) In Millions, unless otherwise specified	3 Months Ended										9 Months Ended												3 Months Ended
	Mar. 31, 2013 USD ($)	Mar. 31, 2013 EUR (€)	Sep. 30, 2013 USD ($)	Sep. 30, 2013 Line of Credit Facility USD ($)	Sep. 30, 2013 Outside Effective Credit Facility USD ($)	Sep. 30, 2013 Real Estate Investment USD ($)	Sep. 30, 2013 Real Estate Investment EUR (€)	Sep. 30, 2013 Real Estate Investment Upper Limit USD ($)	Sep. 30, 2013 Information Technology Hardware, Software, Accounting, Finance, and Maintenance Services USD ($)	Sep. 30, 2013 Renovation of Leased Hotel USD ($)	Sep. 30, 2013 Investment in Other Joint Venture Commitment Group 4 Entity	Sep. 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 (€)	Sep. 30, 2013 Commitments USD ($)	Sep. 30, 2013 Lodging Property USD ($)	Sep. 30, 2013 Full Service and Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment USD ($)	Sep. 30, 2013 Full Service and Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment Upper Limit USD ($)	Sep. 30, 2013 Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment USD ($)	Sep. 30, 2013 Limited Service Equity Investment for Non Controlling Interest in Partnership Commitment Upper Limit USD ($)	Jun. 30, 2013 Debt Securities Mandatorily Redeemable Preferred Equity Ownership Interest hotel	Sep. 30, 2013 Debt Securities Mandatorily Redeemable Preferred Equity Ownership Interest USD ($)
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													2
Investment commitments expected to be funded in 2014						8													7		13
Investment commitments expected to be funded in 2015						3													2		8
Investment commitments not expected to be funded																	34		1
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									116
Purchase commitments expected to be funded in 2013									33
Purchase commitments expected to be funded in 2014						45	33		53
Purchase commitments expected to be funded in 2015									17
Purchase commitments expected to be funded in 2016									13
Number of hotels included in investment commitments																							3
Loan commitment, amount																		5
Loan commitment, amount funded																		1
Loan commitment, amount expected to be funded in the remainder of 2013																		3
Loan commitment, amount not expected to be funded																		1
Letters of credit outstanding			68	1	67
Surety bonds issued			$ 121