Segment Information - Results of Segment Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Customer Sales	$ 4,429	$ 5,017	$ 9,024	$ 10,189
Intersegment Sales	0	0	0	0
Total	4,429	5,017	9,024	10,189
Income (loss) from investees	(3)	44	5	68
Income (loss) from operations	(7)	253	31	180
Total reportable segments
Segment Reporting Information [Line Items]
Customer Sales	4,363	4,990	8,935	10,051
Intersegment Sales	328	567	665	1,068
Total	4,691	5,557	9,600	11,119
Income (loss) from investees	(2)	45	7	70
Income (loss) from operations	4	314	93	592
Total reportable segments | Flat-rolled
Segment Reporting Information [Line Items]
Customer Sales	2,876	3,356	5,979	6,656
Intersegment Sales	326	539	661	990
Total	3,202	3,895	6,640	7,646
Income (loss) from investees	3	45	13	73
Income (loss) from operations	(51)	177	(64)	360
Total reportable segments | USSE
Segment Reporting Information [Line Items]
Customer Sales	778	763	1,561	1,578
Intersegment Sales	1	26	2	75
Total	779	789	1,563	1,653
Income (loss) from investees	0	0	0	0
Income (loss) from operations	10	34	48	0
Total reportable segments | Tubular
Segment Reporting Information [Line Items]
Customer Sales	709	871	1,395	1,817
Intersegment Sales	1	2	2	3
Total	710	873	1,397	1,820
Income (loss) from investees	(5)	0	(6)	(3)
Income (loss) from operations	45	103	109	232
Other Businesses
Segment Reporting Information [Line Items]
Customer Sales	66	27	89	138
Intersegment Sales	35	36	69	92
Total	101	63	158	230
Income (loss) from investees	(1)	(1)	(2)	(2)
Income (loss) from operations	43	16	48	33
Reconciling Items and Eliminations
Segment Reporting Information [Line Items]
Customer Sales	0	0	0	0
Intersegment Sales	(363)	(603)	(734)	(1,160)
Total	(363)	(603)	(734)	(1,160)
Income (loss) from investees	0	0	0	0
Income (loss) from operations	$ (54)	$ (77)	$ (110)	$ (445)