From Marriott.com. Here's the page link:

http://marriott.com/rewards/terms/elite.mi

Platinum and Gold Membership

Hotels located in the United States will pay all Elite Benefits Guarantee compensation in US dollars. Hotels located in Canada will pay $100/$50/$25 CAD. International hotels will pay the equivalent of $100/$50/$25 USD in local currency.

The maximum Elite Benefits Guarantee compensation paid to a Platinum or Gold member during a stay in the United States will be $100 USD, even if more than one Guaranteed benefit is not delivered to the member. The maximum Elite Benefits Guarantee compensation paid to a Platinum or Gold member during a stay in Canada will be $100 CAD, even if more than one Guaranteed benefit is not delivered to the member. The maximum Elite Benefits Guarantee compensation paid to a Platinum or Gold member during a stay outside the United States or Canada will be the equivalent of $100 USD paid in local currency, even if more then one Guaranteed benefit is not delivered to the member.

If a member believes that compensation is due with respect to any aspect of the Elite Benefits Guarantee, he/she must request payment of the compensation while still a guest at the hotel, prior to checking out. Failure to request such payment prior to check out will result in a complete waiver of any right to receive such compensation.

In order to qualify for the Guarantee, the member's Marriott Rewards number, Elite status, smoking and bed type preferences must be included with the reservation. Reservations made through meeting planners, travel agents, wholesalers or other third party sources must include this information in order to be included in the Guarantee.

The Room Type Guarantee covers bed type preferences at Marriott Hotels, Resorts & Suites and Renaissance Hotels, Resorts & Suites and smoking/non-smoking preferences at Marriott Hotels, Resorts & Suites, Renaissance Hotels, Resorts & Suites, Courtyard, Fairfield Inn & Suites, Residence Inn, SpringHill Suites and TownePlace Suites properties (pillow, room location, extra bed, crib requests, etc. are not included in the Guarantee). Exact bed sizes may vary at International hotels.

The Room Type Guarantee does not cover room upgrades.

A member who makes a reservation on the same day he/she plans to arrive at the hotel, or a member who walks in to a hotel without a reservation is not eligible to receive the Room Type Guarantee.

Platinum members are eligible to receive the Room Type Guarantee at any Marriott Hotels & Resorts, Renaissance Hotels & Resorts, Courtyard, Residence Inn, Fairfield Inn & Suite, SpringHill Suites or TownePlace Suites property worldwide. Gold members are eligible to receive the Room Type Guarantee at any Marriott Hotels & Resorts, Renaissance Hotels & Resorts, Courtyard by Marriott, Residence Inn, Fairfield Inn or Suite, SpringHill Suite or TownePlace Suite property located in North America.

Guaranteed Concierge/Executive Club Lounge* access applies to regular hours of operation at Marriott hotels, JW Marriott hotels and Renaissance hotels worldwide. For Marriott hotels, JW Marriott hotels or Renaissance hotels without a Concierge/Executive Club Lounge or if the Lounge is closed, the guest is entitled to receive a free Healthy Start Breakfast, Monday through Friday.

*Not available at resort locations.

The Platinum Arrival Gift 500 bonus points option is available only to point earning Marriott Rewards Platinum members staying at participating Marriott Hotels & Resorts and Renaissance Hotels & Resorts worldwide. Members earning miles can not choose the 500 bonus points.

As of June 2, 2003, the Platinum Arrival Gift 250 bonus points option is now available only to point earning Marriott Rewards Platinum members staying at Courtyard hotels located outside of North America.

Guests accompanying Platinum or Gold members to a Marriott hotel are not eligible for the Elite Benefits Guarantee.

The Guarantee applies to all stays, including Marriott Rewards redemption stays.

Platinum and Gold members who do not receive their Elite Benefits Guarantee or Ultimate Reservation Guarantee in Russia, any other country subject to currency restrictions or any country prohibited by law to compensate the member in the form of a cash payment will be compensated with Marriott Rewards bonus points.

If an Elite member has a confirmed reservation, but is walked from the hotel upon arrival, the property will pay the Ultimate Reservation Guarantee compensation in place today under the Marriott Rewards program Terms and Conditions. If a Platinum or Gold member receives Ultimate Reservation Guarantee compensation then he/she is not eligible to receive additional Elite Benefits Guarantee compensation.