An asterisk * in the title indicates the field is mandatory.
If a field has a default value, it is shown in the Description column.
If the field type is an array, the Field Name has a .[n] suffix, where n is the array index placeholder.
Object and array field names are listed to provide context. If a field belongs to an object or an array, the full field name is shown in dot separated notation.

Title		Description	Details
WhenCreatedUTC			Field Name: WhenCreatedUTC Type: String Format: date-time
IsDefaultArbitrationMailbox		This parameter is available only in the cloud-based service. The IsDefaultArbitrationMailbox switch configures this policy as the default retention policy for arbitration mailboxes in your Exchange Online organization.	Field Name: IsDefaultArbitrationMailbox Type: Boolean
OrganizationId			Field Name: OrganizationId Type: String
AdminDisplayName			Field Name: AdminDisplayName Type: String
PSShowComputerName			Field Name: PSShowComputerName Type: Boolean
	ObjectClass		Field Name: ObjectClass.[n] Type: Array
PSComputerName			Field Name: PSComputerName Type: String
RetentionId		The RetentionId parameter specifies the identity of the retention policy to ensure mailboxes moved from an on-premises Exchange deployment to the cloud continue to have the same retention policy applied to them. The RetentionId parameter is used in cross-premises deployments. You don't need to specify this parameter in on-premises-only deployments.	Field Name: RetentionId Type: String
Identity		The Identity parameter specifies the policy name.	Field Name: Identity Type: String
DistinguishedName			Field Name: DistinguishedName Type: String
OriginatingServer			Field Name: OriginatingServer Type: String
Name *		The Name parameter specifies the policy name.	Field Name: Name Type: String
WhenCreated			Field Name: WhenCreated Type: String Format: date-time
ExchangeVersion			Field Name: ExchangeVersion Type: String
IsDefault		This parameter is reserved for internal Microsoft use.	Field Name: IsDefault Type: Boolean
DomainController		This parameter is available only in on-premises Exchange 2016. The DomainController parameter specifies the domain controller that's used by this cmdlet to read data from or write data to Active Directory. You identify the domain controller by its fully qualified domain name (FQDN). For example, dc01.contoso.com.	Field Name: DomainController Type: String
ObjectCategory			Field Name: ObjectCategory Type: String
IsValid			Field Name: IsValid Type: Boolean
WhenChanged			Field Name: WhenChanged Type: String Format: date-time
WhenChangedUTC			Field Name: WhenChangedUTC Type: String Format: date-time
ObjectState			Field Name: ObjectState Type: String
	RetentionPolicyTagLinks	The RetentionPolicyTagLinks parameter specifies the names of retention policy tags to be associated with this policy.	Field Name: RetentionPolicyTagLinks.[n] Type: Array
RunspaceId			Field Name: RunspaceId Type: String
Guid			Field Name: Guid Type: String
Id			Field Name: Id Type: String

Model: device/exchangeonline/RetentionPolicy

Model Details: device/exchangeonline/RetentionPolicy