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Schedule Of Operating Results And Assets Of Alcoa's Reportable Segments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Third-party sales	$ 5,887	$ 6,526	$ 11,841	$ 12,455
Intersegment sales	1,402	1,707	2,824	3,248
Total sales	7,289	8,233	14,665	15,703
Equity income	(10)	21	(12)	26
Depreciation, depletion, and amortization	343	355	689	695
Income taxes	95	222	202	414
After-tax operating income (ATOI)	275	635	571	1,190
Segment Information \| Alumina
Segment Reporting Information [Line Items]
Third-party sales	750	926	1,525	1,736
Intersegment sales	576	723	1,193	1,356
Total sales	1,326	1,649	2,718	3,092
Equity income	1	22	2	25
Depreciation, depletion, and amortization	114	112	228	215
Income taxes	(6)	60	(7)	104
After-tax operating income (ATOI)	23	186	58	328
Segment Information \| Primary Metals
Segment Reporting Information [Line Items]
Third-party sales	1,804	2,145	3,748	4,125
Intersegment sales	782	922	1,543	1,761
Total sales	2,586	3,067	5,291	5,886
Equity income	(9)	(1)	(11)
Depreciation, depletion, and amortization	133	142	268	283
Income taxes	(19)	55	(32)	108
After-tax operating income (ATOI)	(3)	201	7	403
Segment Information \| Global Rolled Products
Segment Reporting Information [Line Items]
Third-party sales	1,913	2,085	3,758	3,977
Intersegment sales	44	62	88	131
Total sales	1,957	2,147	3,846	4,108
Equity income	(2)		(3)
Depreciation, depletion, and amortization	57	60	114	118
Income taxes	43	35	92	68
After-tax operating income (ATOI)	95	99	191	180
Segment Information \| Engineered Products And Solutions
Segment Reporting Information [Line Items]
Third-party sales	1,420	1,370	2,810	2,617
Total sales	1,420	1,370	2,810	2,617
Equity income				1
Depreciation, depletion, and amortization	39	41	79	79
Income taxes	77	72	149	134
After-tax operating income (ATOI)	$ 160	$ 149	$ 315	$ 279