Statement Of Consolidated Comprehensive (Loss) Income (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net income (loss)	$ 225	$ 109	$ 968	$ 100
Other comprehensive (loss) income, net of tax:
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	63	30	162	(8)
Foreign currency translation adjustments	(1,459)	1,137	(556)	593
Unrealized (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains	(2)	1	(1)	(1)
Net amount reclassified to earnings				2
Net change in unrealized (losses) gains on available-for-sale securities	(2)	1	(1)	1
Unrecognized gains (losses) on derivatives (P):
Net change from periodic revaluations	150	(250)	71	(35)
Net amount reclassified to earnings	33	28	115	107
Net unrecognized gains (losses) on derivatives	183	(222)	186	72
Total Other comprehensive (loss) income, net of tax	(1,215)	946	(209)	658
Comprehensive (loss) income	(990)	1,055	759	758
Alcoa Inc. [Member]
Net income (loss)	172	61	802	(4)
Other comprehensive (loss) income, net of tax:
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	62	29	158	(11)
Foreign currency translation adjustments	(1,108)	895	(386)	342
Unrealized (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains	(2)	1	(1)	(1)
Net amount reclassified to earnings				2
Net change in unrealized (losses) gains on available-for-sale securities	(2)	1	(1)	1
Unrecognized gains (losses) on derivatives (P):
Net change from periodic revaluations	149	(248)	65	(35)
Net amount reclassified to earnings	32	28	114	107
Net unrecognized gains (losses) on derivatives	181	(220)	179	72
Total Other comprehensive (loss) income, net of tax	(867)	705	(50)	404
Comprehensive (loss) income	(695)	766	752	400
Non-Controlling Interests [Member]
Net income (loss)	53	48	166	104
Other comprehensive (loss) income, net of tax:
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	1	1	4	3
Foreign currency translation adjustments	(351)	242	(170)	251
Unrealized (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains
Net amount reclassified to earnings
Net change in unrealized (losses) gains on available-for-sale securities
Unrecognized gains (losses) on derivatives (P):
Net change from periodic revaluations	1	(2)	6
Net amount reclassified to earnings	1		1
Net unrecognized gains (losses) on derivatives	2	(2)	7
Total Other comprehensive (loss) income, net of tax	(348)	241	(159)	254
Comprehensive (loss) income	$ (295)	$ 289	$ 7	$ 358

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to noncontrolling interests, if any. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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