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Schedule Of Inventory Components (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventory [Line Items]
Finished goods	$ 558	$ 537
Work-in-process	987	911
Bauxite and alumina	673	656
Purchased raw materials	565	532
Operating supplies	268	263
Inventories (E)	$ 3,051	$ 2,899

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