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Subsequent Events	6 Months Ended
Subsequent Events	Jun. 30, 2013
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 1, 2013, U. S. Steel entered into a supplier contract dispute settlement agreement. As a result of the agreement, U. S. Steel expects to record a pre-tax gain of $23 million in the third quarter of 2013. On July 12, 2013, U. S. Steel entered into an amendment of the Receivables Purchase Agreement. On July 15, 2013, USSK entered into a €200 million revolving credit facility agreement that replaced USSK's €200 million credit facility that was scheduled to expire in August 2013. See Note 14 for additional details.