Guarantees and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended			1 Months Ended
	Dec. 31, 2012 Hotel	Dec. 31, 2011 Hotel	Dec. 31, 2010 Hotel	Jan. 11, 2013 Subsequent Event Atlanta Marriott Marquis	Jan. 31, 2005 Contingent Consideration Hotel	Dec. 31, 2012 Contingent Consideration	Dec. 31, 2012 Municipal Bonds
Commitments and Contingencies Disclosure [Line Items]
Aggregate contingent liabilities relating to our former restaurant business	$ 21
Guarantee obligation amount							14.7
Debt maturity date							2027
Hotel sold that are still contingently liable for ground lease	3	1	2		2
Future minimum lease payments	1,667					12
Environmental liabilities				$ 5