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Segment Information - Schedule of Operating Results of Alcoa's Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]        
Total sales $ 5,897 $ 5,836 $ 11,716 $ 11,290
Equity loss (23) (30) (42) (68)
Depreciation, depletion, and amortization 306 328 611 647
Income taxes 217 161 492 309
After-tax operating income (ATOI) 568 407 1,224 725
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total sales 6,886 7,024 13,884 13,700
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Intersegment sales 1,027 1,242 2,256 2,529
Third-Party Sales [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Third-party sales 5,859 5,782 11,628 11,171
Alumina [Member]        
Segment Reporting Information [Line Items]        
Equity loss (11) (7) (18) (12)
Depreciation, depletion, and amortization 77 100 157 197
Income taxes 87 12 179 52
After-tax operating income (ATOI) 215 38 436 130
Alumina [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total sales 1,355 1,241 2,743 2,596
Alumina [Member] | Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Intersegment sales 431 480 932 990
Alumina [Member] | Third-Party Sales [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Third-party sales 924 761 1,811 1,606
Primary Metals [Member]        
Segment Reporting Information [Line Items]        
Equity loss (5) (17) (8) (45)
Depreciation, depletion, and amortization 109 129 218 253
Income taxes 6 30 63 19
After-tax operating income (ATOI) 67 97 254 82
Primary Metals [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total sales 2,096 2,377 4,360 4,535
Primary Metals [Member] | Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Intersegment sales 562 718 1,254 1,452
Primary Metals [Member] | Third-Party Sales [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Third-party sales 1,534 1,659 3,106 3,083
Global Rolled Products [Member]        
Segment Reporting Information [Line Items]        
Equity loss (7) (6) (16) (11)
Depreciation, depletion, and amortization 56 58 112 116
Income taxes 25 18 61 47
After-tax operating income (ATOI) 76 70 130 124
Global Rolled Products [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total sales 1,702 1,904 3,359 3,624
Global Rolled Products [Member] | Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Intersegment sales 34 44 70 87
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Third-party sales 1,668 1,860 3,289 3,537
Engineered Products and Solutions [Member]        
Segment Reporting Information [Line Items]        
Depreciation, depletion, and amortization 64 41 124 81
Income taxes 99 101 189 191
After-tax operating income (ATOI) 210 202 404 389
Engineered Products and Solutions [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Total sales 1,733 1,502 3,422 2,945
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Third-party sales $ 1,733 $ 1,502 $ 3,422 $ 2,945