policy
Specifies a list of AWS managed policy ARNs. The behavior depends on the credential type. With iam_user, the policies will be attached to IAM users when they are requested. With assumed_role and federation_token, the policy ARNs will act as a filter on what the credentials can do, similar to policy_document. When credential_type is iam_user or federation_token, at least one of policy_document or policy_arns must be specified.