$ terraform apply
aws_iam_policy.billing_view_access: Refreshing state... (ID: arn:aws:iam::123456789012:policy/BillingViewAccess)
aws_iam_policy.billing_full_access: Refreshing state... (ID: arn:aws:iam::123456789012:policy/BillingFullAccess)

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
-/+ destroy and then create replacement

Terraform will perform the following actions:

-/+ aws_iam_policy.billing_full_access (new resource required)
      id:          "arn:aws:iam::123456789012:policy/BillingFullAccess" => <computed> (forces new resource)
      arn:         "arn:aws:iam::123456789012:policy/BillingFullAccess" => <computed>
      description: "" => "Provides full access to billing resources" (forces new resource)
      name:        "BillingFullAccess" => "BillingFullAccess"
      path:        "/" => "/"
      policy:      "{\n    \"Version\": \"2012-10-17\",\n    \"Statement\": [\n        {\n            \"Sid\": \"VisualEditor0\",\n            \"Effect\": \"Allow\",\n            \"Action\": \"aws-portal:*\",\n            \"Resource\": \"*\"\n        }\n    ]\n}" => "{\n  \"Version\": \"2012-10-17\",\n  \"Statement\": [\n    {\n      \"Sid\": \"VisualEditor0\",\n      \"Effect\": \"Allow\",\n      \"Action\": \"aws-portal:*\",\n      \"Resource\": \"*\"\n    }\n  ]\n}\n"


Plan: 1 to add, 0 to change, 1 to destroy.

Do you want to perform these actions?
  Terraform will perform the actions described above.
  Only 'yes' will be accepted to approve.

  Enter a value: yes

aws_iam_policy.billing_full_access: Destroying... (ID: arn:aws:iam::123456789012:policy/BillingFullAccess)

Error: Error applying plan:

1 error(s) occurred:

* aws_iam_policy.billing_full_access (destroy): 1 error(s) occurred:

* aws_iam_policy.billing_full_access: Error deleting IAM policy arn:aws:iam::123456789012:policy/BillingFullAccess: &awserr.requestError{awsError:(*awserr.baseError)(0xc4208f7740), statusCode:409, requestID:"c09a73f0-f07f-11e7-9e7a-8b2e04753e8d"}

Terraform does not automatically rollback in the face of errors.
Instead, your Terraform state file has been partially updated with
any resources that successfully completed. Please address the error
above and apply again to incrementally change your infrastructure.