LONG-TERM DEBT - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions	Jun. 30, 2025	Feb. 28, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
Commercial paper	$ 1,762		$ 1,582
Credit Facility	0		0
Finance lease obligations	119		124
Other	23		55
Total debt	15,655		14,447
Less current portion	(1,109)		(1,309)
Long-term debt, noncurrent	$ 14,546		13,138
Series P Notes, maturing October 1, 2025
Debt Instrument [Line Items]
Interest rate	3.80%
Senior notes, face amount	$ 350
Effective interest rate	4.00%
Senior notes	$ 350		349
Series R Notes, maturing June 15, 2026
Debt Instrument [Line Items]
Interest rate	3.10%
Senior notes, face amount	$ 750
Effective interest rate	3.30%
Senior notes	$ 749		749
Series V Notes, matured March 15, 2025
Debt Instrument [Line Items]
Interest rate	3.80%
Senior notes, face amount	$ 318
Effective interest rate	2.80%
Senior notes	$ 0		319
Series W Notes, maturing October 1, 2034
Debt Instrument [Line Items]
Interest rate	4.50%
Senior notes, face amount	$ 278
Effective interest rate	4.10%
Senior notes	$ 287		287
Series X Notes, maturing April 15, 2028
Debt Instrument [Line Items]
Interest rate	4.00%
Senior notes, face amount	$ 450
Effective interest rate	4.20%
Senior notes	$ 448		447
Series AA Notes, maturing December 1, 2028
Debt Instrument [Line Items]
Interest rate	4.70%
Senior notes, face amount	$ 300
Effective interest rate	4.80%
Senior notes	$ 299		298
Series EE Notes, matured May 1, 2025
Debt Instrument [Line Items]
Interest rate	5.80%
Senior notes, face amount	$ 600
Effective interest rate	6.00%
Senior notes	$ 0		599
Series FF Notes, maturing June 15, 2030
Debt Instrument [Line Items]
Interest rate	4.60%
Senior notes, face amount	$ 1,000
Effective interest rate	4.80%
Senior notes	$ 992		991
Series GG Notes, maturing October 15, 2032
Debt Instrument [Line Items]
Interest rate	3.50%
Senior notes, face amount	$ 1,000
Effective interest rate	3.70%
Senior notes	$ 990		989
Series HH Notes, maturing April 15, 2031
Debt Instrument [Line Items]
Interest rate	2.90%
Senior notes, face amount	$ 1,100
Effective interest rate	3.00%
Senior notes	$ 1,093		1,093
Series II Notes, maturing October 15, 2033
Debt Instrument [Line Items]
Interest rate	2.80%
Senior notes, face amount	$ 700
Effective interest rate	2.80%
Senior notes	$ 695		695
Series JJ Notes, maturing October 15, 2027
Debt Instrument [Line Items]
Interest rate	5.00%
Senior notes, face amount	$ 1,000
Effective interest rate	5.40%
Senior notes	$ 992		990
Series KK Notes, maturing April 15, 2029
Debt Instrument [Line Items]
Interest rate	4.90%
Senior notes, face amount	$ 800
Effective interest rate	5.30%
Senior notes	$ 789		788
Series LL Notes, maturing September 15, 2026
Debt Instrument [Line Items]
Interest rate	5.50%
Senior notes, face amount	$ 450
Effective interest rate	5.90%
Senior notes	$ 447		447
Series MM Notes, maturing October 15, 2028
Debt Instrument [Line Items]
Interest rate	5.60%
Senior notes, face amount	$ 700
Effective interest rate	5.90%
Senior notes	$ 693		693
Series NN Notes, maturing May 15, 2029
Debt Instrument [Line Items]
Interest rate	4.90%
Senior notes, face amount	$ 500
Effective interest rate	5.30%
Senior notes	$ 492		491
Series OO Notes, maturing May 15, 2034
Debt Instrument [Line Items]
Interest rate	5.30%
Senior notes, face amount	$ 1,000
Effective interest rate	5.60%
Senior notes	$ 981		980
Series PP Notes, maturing March 15, 2030
Debt Instrument [Line Items]
Interest rate	4.80%
Senior notes, face amount	$ 500
Effective interest rate	5.00%
Senior notes	$ 495		495
Series QQ Notes, maturing March 15, 2035
Debt Instrument [Line Items]
Interest rate	5.40%
Senior notes, face amount	$ 1,000
Effective interest rate	5.50%
Senior notes	$ 986		986
Series RR Notes, maturing April 15, 2032
Debt Instrument [Line Items]
Interest rate	5.10%
Senior notes, face amount	$ 500
Effective interest rate	5.40%
Senior notes	$ 493		0
Series RR Notes, maturing April 15, 2032 \| Senior Notes
Debt Instrument [Line Items]
Interest rate		5.10%
Senior notes, face amount		$ 500
Series SS Notes, maturing April 15, 2037
Debt Instrument [Line Items]
Interest rate	5.50%
Senior notes, face amount	$ 1,500
Effective interest rate	5.70%
Senior notes	$ 1,480		$ 0
Series SS Notes, maturing April 15, 2037 \| Senior Notes
Debt Instrument [Line Items]
Interest rate		5.50%
Senior notes, face amount		$ 1,500

MARRIOTT INTERNATIONAL INC /MD/ 10-Q