You can view the billing details about AnalyticDB for PostgreSQL instances in the Expenses and Costs console.
View monthly bills
In the left-side navigation pane, choose Spending Summary > Spending Summary. The page that appears displays the monthly expenses of your clusters. You can export the bills if required.
View bill details
In the left-side navigation pane, choose Spending Summary > Spending Summary. On the page that appears, click the Details tab. On this tab, view bill details by billing cycle, date, or billing period for billable items and clusters.