Source: Federal Reserve Bank of Philadelphia  

Release: FR Y-14M Large Bank Credit Card and Mortgage Data  

Units:  Billions of U.S. Dollars, Not Seasonally Adjusted

Frequency:  Quarterly, End of Quarter

The cumulative net purchase volume for credit card accounts during the quarter. Net purchase volume measures the aggregate dollar amount of purchases made during the current month's cycle, less any returns. Cash advance and balance transfer volumes are excluded.

For more detail see the methodology.