Google Cloud Billing Reports are the built-in cost reports in the Google Cloud console. They show the costs and cost trends of a billing account, including all linked projects, as a chart and table that you can filter and group by project, service, SKU, location or label. There are preset and saved reports and a forecast for the current month, and data can be downloaded as CSV or queried through BigQuery export. The reports are part of Google Cloud and are delivered as SaaS in the console.
Google Cloud is part of Alphabet, headquartered in the United States, and is subject to US jurisdiction, including the CLOUD Act. The reports only work for customers who use Google Cloud; they are not a standalone product. In its Cloud Data Processing Addendum Google states that it acts as a processor of customer data and refers to the GDPR. Where billing data is stored is not published. Organisations wanting cost management independent of a US cloud provider can look at open FinOps tooling.