IAM user security policy for use with linked accounts. Allows access to usage data.

Linked Account Policy

{
    "Version": "2012-10-17",
    "Statement": [
        {
            "Effect": "Allow",
            "Action": [
                "ec2:DescribeInstances",
                "ec2:DescribeImages",
                "ec2:DescribeReservedInstances",
                "cloudwatch:GetMetricStatistics"
            ],
            "Resource": "*"
        }
    ]
}