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Business Segments - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
hotel
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
segment
Dec. 31, 2013
Dec. 28, 2012
Segment Reporting Information [Line Items]                      
Number of operating segments                 4us-gaap_NumberOfOperatingSegments    
Number of business segments                 3us-gaap_NumberOfReportableSegments    
Revenues $ 3,559us-gaap_Revenues $ 3,460us-gaap_Revenues $ 3,484us-gaap_Revenues $ 3,293us-gaap_Revenues $ 3,219us-gaap_Revenues [1] $ 3,160us-gaap_Revenues [1] $ 3,263us-gaap_Revenues [1] $ 3,142us-gaap_Revenues [1],[2] $ 13,796us-gaap_Revenues $ 12,784us-gaap_Revenues [1] $ 11,814us-gaap_Revenues
Segment financial results                 1,088us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 897us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 849us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Number of hotels       3mar_AssetsHeldforsaleNumberofHotels              
Property and Equipment                      
Segment Reporting Information [Line Items]                      
Impairment charge                 25us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_PropertyPlantAndEquipmentMember		    
Total segment                      
Segment Reporting Information [Line Items]                      
Revenues                 13,540us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [3] 12,518us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [3] 11,526us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 [3]
Total segment | International Operations                      
Segment Reporting Information [Line Items]                      
Revenues                 2,518us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_InternationalOperationsMember		 2,149us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_InternationalOperationsMember		 1,912us-gaap_Revenues
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_InternationalOperationsMember
Segment financial results                 327us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_InternationalOperationsMember		 269us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_InternationalOperationsMember		 283us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_InternationalOperationsMember
Total segment | Asia                      
Segment Reporting Information [Line Items]                      
Segment financial results                 99us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_AsiaMember		    
Total segment | Europe                      
Segment Reporting Information [Line Items]                      
Segment financial results                 95us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= us-gaap_EuropeMember		    
Total segment | Middle East And Africa                      
Segment Reporting Information [Line Items]                      
Segment financial results                 27us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_MiddleEastAndAfricaMember		    
Total segment | Caribbean and Latin America                      
Segment Reporting Information [Line Items]                      
Segment financial results                 74us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= mar_CaribbeanandLatinAmericaMember		    
Total segment | Canada                      
Segment Reporting Information [Line Items]                      
Segment financial results                 $ 32us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementGeographicalAxis
= country_CA		    
[1] The sum of the earnings per share for the four quarters differs from annual earnings per share due to the required method of computing the weighted average shares in interim periods.
[2] Beginning in 2013, we changed our financial reporting cycle to a calendar year-end reporting cycle and an end-of-month quarterly reporting cycle. Accordingly, our 2013 first quarter included the period from December 29, 2012 through March 31, 2013.
[3] Revenues attributed to operations located outside the United States were $2,518 million in 2014, $2,149 million in 2013, and $1,912 million in 2012.