Exhibit 23. CONSENT OF INDEPENDENT ACCOUNTANTS We hereby consent to the incorporation by reference in the Registration Statements listed below of our report dated February 7, 2001, relating to the Financial Statement Schedule of USX Corporation listed in Item 14 (a)(2) of this Form 10-K/A: On Form S-3: Relating to: File No. 33-57997 Marathon Group Dividend Reinvestment Plan 33-60172 U.S. Steel Group Dividend Reinvestment Plan 333-56867 USX Corporation Debt Securities, Preferred Stock and Common Stock 333-88947 Marathon Group and U.S. Steel Group Dividend Reinvestment and Direct Stock Purchase Plans 333-88797 USX Corporation Debt Securities, Preferred Stock and Common Stock On Form S-8: Relating to: File No. 33-41864 1990 Stock Plan 33-54333 Parity Investment Bonus 33-60667 Parity Investment Bonus 33-56828 Marathon Oil Company Thrift Plan 33-52917 Savings Fund Plan 333-00429 Savings Fund Plan 333-29699 1990 Stock Plan 333-29709 Marathon Oil Company Thrift Plan 333-52751 1990 Stock Plan 333-86847 1990 Stock Plan /s/ PricewaterhouseCoopers LLP Pittsburgh, PA October 11, 2001