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Restructuring And Other Charges (Schedule Of Restructuring And Other Charges By Reportable Segments, Pretax) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Total restructuring and other charges	$ 15	$ 34	$ 25	$ 40	$ 130
Alumina
Restructuring Cost and Reserve [Line Items]
Total restructuring and other charges	1	25	1	26
Primary Metals
Restructuring Cost and Reserve [Line Items]
Total restructuring and other charges	1		6	2
Global Rolled Products
Restructuring Cost and Reserve [Line Items]
Total restructuring and other charges			1	2
Engineered Products And Solutions
Restructuring Cost and Reserve [Line Items]
Total restructuring and other charges		3	3	3
Segment Total
Restructuring Cost and Reserve [Line Items]
Total restructuring and other charges	2	28	11	33
Corporate
Restructuring Cost and Reserve [Line Items]
Total restructuring and other charges	$ 13	$ 6	$ 14	$ 7

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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