Segment Information (Tables)

9 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Schedule of Operating Results of Alcoa's Reportable Segments

The operating results of Alcoa’s reportable segments were as follows (differences between segment totals and consolidated totals are in Corporate):

	Alumina			Primary Metals			Global Rolled Products			Engineered Products and Solutions		Transportation and Construction Solutions		Total
Third quarter ended September 30, 2015
Sales:
Third-party sales	$	912		$	1,249		$	1,527		$	1,397	$	475	$	5,560
Intersegment sales		391			479			29			—		—		899
Total sales	$	1,303		$	1,728		$	1,556		$	1,397	$	475	$	6,459
Profit and loss:
Equity loss	$	(9	)	$	(7	)	$	(8	)	$	—	$	—	$	(24	)
Depreciation, depletion, and amortization		71			106			56			61		11		305
Income taxes		85			(49	)		28			71		18		153
After-tax operating income (ATOI)		212			(59	)		62			151		44		410
Third quarter ended September 30, 2014
Sales:
Third-party sales	$	886		$	1,865		$	1,926		$	1,034	$	523	$	6,234
Intersegment sales		482			730			52			—		—		1,264
Total sales	$	1,368		$	2,595		$	1,978		$	1,034	$	523	$	7,498
Profit and loss:
Equity loss	$	(7	)	$	—		$	(8	)	$	—	$	—	$	(15	)
Depreciation, depletion, and amortization		100			124			62			32		10		328
Income taxes		26			95			26			78		20		245
ATOI		62			245			69			155		50		581

	Alumina			Primary Metals			Global Rolled Products			Engineered Products and Solutions		Transportation and Construction Solutions		Total
Nine months ended September 30, 2015
Sales:
Third-party sales	$	2,723		$	4,355		$	4,816		$	3,933	$	1,438	$	17,265
Intersegment sales		1,323			1,733			99			—		—		3,155
Total sales	$	4,046		$	6,088		$	4,915		$	3,933	$	1,438	$	20,420
Profit and loss:
Equity loss	$	(27	)	$	(15	)	$	(24	)	$	—	$	—	$	(66	)
Depreciation, depletion, and amortization		228			324			168			166		32		918
Income taxes		264			14			89			228		49		644
ATOI		648			195			192			472		126		1,633
Nine months ended September 30, 2014
Sales:
Third-party sales	$	2,492		$	4,948		$	5,463		$	3,103	$	1,521	$	17,527
Intersegment sales		1,472			2,182			139			—		—		3,793
Total sales	$	3,964		$	7,130		$	5,602		$	3,103	$	1,521	$	21,320
Profit and loss:
Equity loss	$	(19	)	$	(45	)	$	(19	)	$	—	$	—	$	(83	)
Depreciation, depletion, and amortization		297			377			178			95		31		978
Income taxes		78			114			73			234		55		554
ATOI		192			327			193			455		142		1,309

Schedule of Segment ATOI to Consolidated Net Income Attributable to Alcoa

The following table reconciles total segment ATOI to consolidated net income attributable to Alcoa:

	Third quarter ended September 30,						Nine months ended September 30,
	2015			2014			2015			2014
Total segment ATOI	$	410		$	581		$	1,633		$	1,309
Unallocated amounts (net of tax):
Impact of LIFO		50			(18	)		93			(33	)
Metal price lag		(48	)		38			(110	)		56
Interest expense		(80	)		(81	)		(240	)		(228	)
Noncontrolling interests		(62	)		18			(189	)		46
Corporate expense		(72	)		(72	)		(199	)		(204	)
Restructuring and other charges		(48	)		(189	)		(368	)		(587	)
Other		(106	)		(128	)		(241	)		(250	)
Consolidated net income attributable to Alcoa	$	44		$	149		$	379		$	109