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Segment Information (Schedule Of Reconciliation Of Total Segment ATOI To Consolidated Net Income (Loss)) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Total segment ATOI	$ 462	$ 328	$ 1,652	$ 1,015
Interest expense	(125)	(139)	(399)	(376)
Noncontrolling interests	(53)	(48)	(166)	(104)
Discontinued operations			(5)	(8)
Consolidated net income (loss) attributable to Alcoa	172	61	802	(4)
Unallocated Amounts [Member]
Impact of LIFO	2	(2)	(49)	(19)
Interest expense	(81)	(91)	(259)	(245)
Noncontrolling interests	(53)	(48)	(166)	(104)
Corporate expense	(76)	(71)	(219)	(197)
Restructuring and other charges	(7)	1	(35)	(142)
Discontinued operations			(5)	(8)
Other	$ (75)	$ (56)	$ (117)	$ (304)

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