The Customer Responsibility Matrix is the appropriate document to review when seeking to understand Google's inherent controls for PCI compliance. This matrix clearly delineates the responsibilities of both Google and the customer regarding compliance with various standards and regulations, including PCI DSS.
The matrix provides valuable insights into which aspects of security and compliance are handled by Google as part of its cloud services, and which aspects remain the customer's responsibility. By consulting this document, organizations can effectively gauge how Google’s infrastructure and service offerings might meet their requirements for PCI compliance, ensuring they are aware of the shared responsibility model specific to PCI standards.
While other documents such as the Compliance Overview, Cloud Security Whitepaper, and Best Practices Guide provide useful information about Google Cloud's security posture and compliance strategies, they do not specifically focus on the shared responsibilities between Google and its customers concerning PCI compliance as the Customer Responsibility Matrix does.