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Debt - Eligible Accounts Receivable and Receivables Sold to Third Party Conduits (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Balance of accounts receivable-net, eligible for sale to third-parties $ 782x_TradeReceivablesNetPurchasedBySubsidiaryUnderReceivablesPurchaseAgreement $ 1,013x_TradeReceivablesNetPurchasedBySubsidiaryUnderReceivablesPurchaseAgreement
Accounts receivable sold to third-parties 0us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount 0us-gaap_TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount
Balance included in Receivables on the balance sheet of U. S. Steel $ 782x_AccountsReceivablePurchasedBySubsidiaryUnderReceivablesPurchaseAgreementExcludingRevolvingInterestSoldToConduits $ 1,013x_AccountsReceivablePurchasedBySubsidiaryUnderReceivablesPurchaseAgreementExcludingRevolvingInterestSoldToConduits