XML 36 R44.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Segment and Geographic Area Information - Schedule of Operating Results of Alcoa's Reportable Segment (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2014 | Mar. 31, 2013
Segment Reporting Information [Line Items] |  |
Total sales | $ 6,676 | $ 7,159
Equity income (loss) | (38) | (12)
Depreciation, depletion, and amortization | 319 | 341
Income taxes | 154 | 138
After-tax operating income (ATOI) | 325 | 351
Intersegment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Intersegment sales | 1,287 | 1,373
Third-Party Sales [Member] | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 5,389 | 5,786
Alumina [Member] |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,355 | 1,421
Equity income (loss) | (5) | 1
Depreciation, depletion, and amortization | 97 | 109
Income taxes | 40 | 14
After-tax operating income (ATOI) | 92 | 58
Alumina [Member] | Intersegment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Intersegment sales | 510 | 595
Alumina [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 845 | 826
Primary Metals [Member] |  |
Segment Reporting Information [Line Items] |  |
Total sales | 2,158 | 2,485
Equity income (loss) | (28) | (9)
Depreciation, depletion, and amortization | 124 | 135
Income taxes | (11) | 1
After-tax operating income (ATOI) | (15) | 39
Primary Metals [Member] | Intersegment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Intersegment sales | 734 | 727
Primary Metals [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 1,424 | 1,758
Global Rolled Products [Member] |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,720 | 1,830
Equity income (loss) | (5) | (4)
Depreciation, depletion, and amortization | 58 | 57
Income taxes | 34 | 39
After-tax operating income (ATOI) | 59 | 81
Global Rolled Products [Member] | Intersegment Sales [Member] |  |
Segment Reporting Information [Line Items] |  |
Intersegment sales | 43 | 51
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | 1,677 | 1,779
Engineered Products and Solutions [Member] |  |
Segment Reporting Information [Line Items] |  |
Total sales | 1,443 | 1,423
Depreciation, depletion, and amortization | 40 | 40
Income taxes | 91 | 84
After-tax operating income (ATOI) | 189 | 173
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member] |  |
Segment Reporting Information [Line Items] |  |
Third-party sales | $ 1,443 | $ 1,423

X
- Definition Segment reporting information depreciation depletion and amortization expense total. + References No definition available. + Details
Name: | aa_SegmentReportingInformationDepreciationDepletionAndAmortizationExpenses
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Equity in net income of equity method investees of segment total. + References No definition available. + Details
Name: | aa_SegmentReportingInformationEquityInNetIncomeOfEquityMethodInvesteesOfSegments
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Segment reporting information income tax expense benefit total. + References No definition available. + Details
Name: | aa_SegmentReportingInformationIncomeTaxExpensesBenefits
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Segment reporting information intersegment revenue total. + References No definition available. + Details
Name: | aa_SegmentReportingInformationIntersegmentRevenues
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Segment reporting information profit loss total. + References No definition available. + Details
Name: | aa_SegmentReportingInformationProfitsLosses
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Segment reporting information revenue net. + References No definition available. + Details
Name: | aa_SegmentReportingInformationRevenueNet
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Segment reporting information revenue from external customers total. + References No definition available. + Details
Name: | aa_SegmentReportingInformationRevenuesFromExternalCustomers
Namespace Prefix: | aa_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration