Cash Collateralized for Guarantee Obligations in Effect After Two Years and Within Seven Years

No definition available.

Name:	mar_CashCollateralizedForGuaranteeObligationsInEffectAfterTwoYearsAndWithinSevenYears
Namespace Prefix:	mar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Cash Collateralized for Guarantee Obligations Within Two Years

+ References

No definition available.

+ Details

Name:	mar_CashCollateralizedForGuaranteeObligationsWithinTwoYears
Namespace Prefix:	mar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Collateral for Continuing Lease Obligation Contingency, Future Minimum Payments Due, Annual Amount for Period After Two Years and Within Seven Years

+ References

No definition available.

+ Details

Name:	mar_CollateralForContinuingLeaseObligationContingencyFutureMinimumPaymentsDueAnnualAmountForPeriodAfterTwoYearsAndWithinSevenYears
Namespace Prefix:	mar_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	mar_CommitmentsAndContingenciesDisclosureLineItems
Namespace Prefix:	mar_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Funding Guarantees, Maximum Term

+ References

No definition available.

+ Details

Name:	mar_FundingGuaranteesMaximumTerm
Namespace Prefix:	mar_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Funding Guarantees, Minimum Term

+ References

No definition available.

+ Details

Name:	mar_FundingGuaranteesMinimumTerm
Namespace Prefix:	mar_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The carrying amount of the liability for expected future funding as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	mar_GuaranteeObligationsCarryingValue
Namespace Prefix:	mar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of cash collateral as of the balance sheet date that CTF Holdings Ltd. made available in the event that Marriott is required to fund under these guarantees.

+ References

No definition available.

+ Details

Name:	mar_GuaranteeObligationsCashCollateralized
Namespace Prefix:	mar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line of Credit Facility Provided by Third Party, Current Borrowing Capacity for Period After Two Years and Within Seven Years

+ References

No definition available.

+ Details

Name:	mar_LineOfCreditFacilityProvidedByThirdPartyCurrentBorrowingCapacityForPeriodAfterTwoYearsAndWithinSevenYears
Namespace Prefix:	mar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Net Worth of Reimbursing Counterparty

+ References

No definition available.

+ Details

Name:	mar_NetWorthOfReimbursingCounterparty
Namespace Prefix:	mar_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Number of Guarantees Provided

+ References

No definition available.

+ Details

Name:	mar_NumberOfGuaranteesProvided
Namespace Prefix:	mar_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Operating Lease Extension, Term

+ References

No definition available.

+ Details

Name:	mar_OperatingLeaseExtensionTerm
Namespace Prefix:	mar_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 5

-Paragraph 9

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_GuaranteeObligationsCurrentCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (b)(1)

-URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248

+ Details

Name:	us-gaap_GuaranteeObligationsMaximumExposure
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 16

-Subparagraph b(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 122

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

-URI http://asc.fasb.org/extlink&oid=6584154&loc=d3e38371-112697

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

-Paragraph 2

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of required minimum rental payments maturing in the next fiscal year following the latest fiscal year for operating leases having an initial or remaining non-cancelable letter-terms in excess of one year.

+ References

+ Details

Name:	us-gaap_OperatingLeasesFutureMinimumPaymentsDueCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow associated with principal collections from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 16

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 15

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3179-108585

+ Details

Name:	us-gaap_ProceedsFromCollectionOfNotesReceivable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Contingencies - Guarantees (Details)																									3 Months Ended
Contingencies - Guarantees (Details)	Jun. 15, 2012	Jun. 15, 2012 Primary Obligor USD ($)	Jun. 15, 2012 Primary Obligor Other Current Liabilities USD ($)	Jun. 15, 2012 Primary Obligor Other Long Term Liabilities USD ($)	Jun. 15, 2012 Secondarily Liable USD ($)	Jun. 15, 2012 Guarantee, Operating Profit Primary Obligor USD ($)	Jun. 15, 2012 Guarantee, Indebtedness of Others Primary Obligor USD ($)	Jun. 15, 2012 Lease Obligations and Debt Securities Payable USD ($)	Jun. 15, 2012 Debt Securities Payable Secondarily Liable USD ($)	Jun. 15, 2012 Not Yet In Effect Condition Guarantee, Indebtedness of Others Primary Obligor USD ($)	Dec. 30, 2011 Sunrise Senior Living Inc Secondarily Liable USD ($)	Jun. 15, 2012 Sunrise Senior Living Inc Property Lease Guarantee Secondarily Liable USD ($)	Jun. 15, 2012 Sunrise Senior Living Inc Debt Securities Payable Secondarily Liable USD ($)	Jun. 15, 2012 CNL Retirement Properties Inc Debt Securities Payable Secondarily Liable USD ($)	Jun. 15, 2012 Five Star Senior Living Debt Securities Payable Secondarily Liable USD ($)	Jun. 15, 2012 Renaissance Hotel Group N.V. Property Lease Guarantee Secondarily Liable USD ($)	Jun. 15, 2012 Renaissance Hotel Group N.V. Property Lease Guarantee Secondarily Liable EUR (€)	Sep. 09, 2005 Renaissance Hotel Group N.V. Property Lease Guarantee Secondarily Liable EUR (€)	Jun. 15, 2012 MVW Spin-off Secondarily Liable USD ($)	Jun. 15, 2012 Project Two Project Completion Guarantee USD ($)	Jun. 15, 2012 Project Two Project Completion Guarantee CAD	Jun. 15, 2012 Expiration in 2022 MVW Spin-off Secondarily Liable USD ($) Contract	Jun. 15, 2012 Expiration in 2022 MVW Spin-off Secondarily Liable SGD	Jun. 15, 2012 Letter of Credit Key Bank Sunrise Senior Living Inc Property Lease Guarantee Secondarily Liable USD ($)	Jun. 15, 2012 Ritz-Carlton USD ($)	Dec. 30, 2011 Ritz-Carlton Guarantee, Operating Profit Primary Obligor USD ($)	Jun. 15, 2012 Ritz-Carlton Guarantee, Operating Profit Secondarily Liable USD ($)	Jun. 15, 2012 ExecuStay Property Lease Guarantee USD ($)	Jun. 15, 2012 ExecuStay Lease is Terminated by End of 2013 Property Lease Guarantee Secondarily Liable USD ($)	Jun. 15, 2012 ExecuStay Lease is Terminated After End of 2013 Property Lease Guarantee Secondarily Liable USD ($)
Commitments and Contingencies Disclosure [Line Items]
Funding guarantees, minimum term (in years)	4 years
Funding guarantees, maximum term (in years)	10 years
Liability for guarantees		$ 56,000,000	$ 9,000,000	$ 47,000,000		$ 43,000,000	$ 10,000,000
Maximum potential amount of future fundings		224,000,000			154,000,000	102,000,000	107,000,000		36,000,000	34,000,000		118,000,000	6,000,000	29,000,000	1,000,000				32,000,000	495,000,000	510,000,000	20,000,000	26,000,000			69,000,000	69,000,000		11,000,000	6,000,000
Payment received for notes receivable																									69,000,000
Pro rata ownership in the joint venture																				20.00%	20.00%
Guarantee obligations, carrying value								3,000,000											2,000,000	3,000,000								1,000,000
Net worth of reimbursing counterparty																											1,000,000,000
Number of guarantees provided																						1	1
Cash collateral in the event funding is required											3,000,000
Cash collateralized for lease guarantee, after two years and within seven years												1,000,000
Length of operating lease extension												5 years
Letter of credit provided by Sunrise, amount available																								85,000,000
Collateral for continuing lease obligation contingency, future minimum annual payments due												1,000,000
Annual rent payments, approximately																6,000,000
Remaining rent payments, approximately																40,000,000
Guarantee obligations, cash collateralized																$ 5,000,000	€ 4,000,000	€ 35,000,000