code: def total_bytes_billed(self):
          
          result = self._job_statistics().get("totalBytesBilled")
          if result is not None:
              result = int(result)
          return result
docs: Return total bytes billed from job statistics, if present.
  
          See:
          https://cloud.google.com/bigquery/docs/reference/rest/v2/jobs#statistics.query.totalBytesBilled
  
          :rtype: int or None
          :returns: total bytes processed by the job, or None if job is not
                    yet complete.