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AWS Billing and Cost Management
User Guide (Version 2.0)

Reservation Details

You can use the reservation columns to find out more about a reserved resource. The columns include but are not limited to the following:

reservation/AvailabilityZone

The Availability Zone of the resource associated with this line item.

reservation/NumberOfReservations

The number of reservations covered by this subscription. For example, one Reserved Instance (RI) subscription may have four associated RI reservations.

reservation/ReservationARN

The ARN of the Reserved Instance that this line item benefitted from.

reservation/TotalReservedUnits

The total number of reserved units in the subscription. In the case of a Reserved Instance (RI), this is the total number of hours across all RIs in this subscription. This is calculated by multiplying the NumberOfReservations by the UnitsPerReservation.

reservation/UnitsPerReservation

The number of usage units reserved by a single reservation in a given subscription, such as how many hours a single Amazon EC2 RI has reserved.