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Segment and Geographic Area Information - Schedule of Operating Results of Arconic's Reportable Segment (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Total sales $ 2,967 $ 3,138 $ 3,234 $ 3,055 $ 2,991 $ 3,127 $ 3,204 $ 3,091 $ 12,394 $ 12,413 $ 12,542
Depreciation and amortization                 504 479 390
Income taxes                 472 430 434
ATOI                 1,087 986 983
Capital expenditures                 689 716  
Goodwill 4,817       4,919       4,817 4,919  
Total assets 15,415       15,540       15,415 15,540  
Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total sales                 12,512 12,602 12,767
Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Intersegment sales                 118 125 185
Total sales                 (118) (125) (185)
Third-Party Sales [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Third-party sales                 12,394 12,477 12,582
Global Rolled Products [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 201 203 211
Income taxes                 107 85 67
ATOI                 269 225 224
Capital expenditures                 293 256  
Goodwill 181       201       181 201  
Total assets 3,891       3,861       3,891 3,861  
Global Rolled Products [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total sales                 4,982 5,378 6,529
Global Rolled Products [Member] | Intersegment Eliminations [Member]                      
Segment Reporting Information [Line Items]                      
Intersegment sales                 118 125 185
Global Rolled Products [Member] | Third-Party Sales [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Third-party sales                 4,864 5,253 6,344
Engineered Products and Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 255 233 137
Income taxes                 298 282 298
ATOI                 642 595 579
Capital expenditures                 333 383  
Goodwill 4,579       4,660       4,579 4,660  
Total assets 10,542       10,732       10,542 10,732  
Engineered Products and Solutions [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total sales                 5,728 5,342 4,217
Engineered Products and Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Third-party sales                 5,728 5,342 4,217
Transportation and Construction Solutions [Member]                      
Segment Reporting Information [Line Items]                      
Depreciation and amortization                 48 43 42
Income taxes                 67 63 69
ATOI                 176 166 180
Capital expenditures                 63 77  
Goodwill 57       58       57 58  
Total assets $ 982       $ 947       982 947  
Transportation and Construction Solutions [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Total sales                 1,802 1,882 2,021
Transportation and Construction Solutions [Member] | Third-Party Sales [Member] | Operating Segments [Member]                      
Segment Reporting Information [Line Items]                      
Third-party sales                 $ 1,802 $ 1,882 $ 2,021