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Long-Term Debt - Additional Information (Detail) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 28, 2012
Dec. 31, 2014
Sep. 30, 2013
Mar. 31, 2013
Debt Instrument [Line Items]            
Cash paid for interest, net of amounts capitalized $ 79,000,000us-gaap_InterestPaidNet $ 83,000,000us-gaap_InterestPaidNet $ 83,000,000us-gaap_InterestPaidNet      
Multicurrency revolving credit agreement, aggregate effective borrowings 2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity     2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Series N Senior Notes 3.1% Due October 15, 2021            
Debt Instrument [Line Items]            
Senior Notes, face amount 400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mar_SeriesNSeniorNotesMember
    400,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mar_SeriesNSeniorNotesMember
   
Debt instrument, stated interest rate 3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mar_SeriesNSeniorNotesMember
    3.10%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mar_SeriesNSeniorNotesMember
   
Proceeds from debt, net of issuance costs       394,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= mar_SeriesNSeniorNotesMember
   
Series M Senior Notes 3.4% Due October 15, 2020            
Debt Instrument [Line Items]            
Senior Notes, face amount 350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mar_SeriesMSeniorNotesMember
    350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mar_SeriesMSeniorNotesMember
350,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= mar_SeriesMSeniorNotesMember
 
Debt instrument, stated interest rate 3.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mar_SeriesMSeniorNotesMember
    3.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mar_SeriesMSeniorNotesMember
3.40%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= mar_SeriesMSeniorNotesMember
 
Proceeds from debt, net of issuance costs         345,000,000us-gaap_ProceedsFromDebtNetOfIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= mar_SeriesMSeniorNotesMember
 
Series J, Senior Notes matured February 15, 2013            
Debt Instrument [Line Items]            
Payment made to retire debt at maturity           $ 411,000,000us-gaap_MaturitiesOfSeniorDebt
/ us-gaap_DebtInstrumentAxis
= mar_SeriesJSeniorNotesMember