EXHIBIT 23 CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (No. 333-80957) of Conoco Inc. of our report dated June 11, 2002 relating to the financial statements of the Thrift Plan for Employees of Conoco Inc., which appears in this Form 11-K. PRICEWATERHOUSECOOPERS LLP Houston, Texas June 13, 2002