Goodwill and Other Intangible Assets - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	$ 1,731	$ 1,731
Impairment of goodwill amount after noncontrolling interest	1,719
Amortization expense related to the intangible assets		73	82	86
Primary Metals [Member]
Finite-Lived Intangible Assets [Line Items]
Impairment of goodwill	1,731	989
Impairment of goodwill amount after noncontrolling interest	1,719	1,719
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Expected amortization for the year 2014	60	60
Expected amortization for the year 2015	60	60
Expected amortization for the year 2016	60	60
Expected amortization for the year 2017	60	60
Expected amortization for the year 2018	60	60
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Expected amortization for the year 2014	70	70
Expected amortization for the year 2015	70	70
Expected amortization for the year 2016	70	70
Expected amortization for the year 2017	70	70
Expected amortization for the year 2018	$ 70	$ 70