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Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Goodwill gross, beginning balance $ 5,185 $ 5,056
Accumulated impairment losses, beginning balance (28) (28)
Goodwill, beginning balance 5,157 5,028
Acquisition of businesses (1) 150
Translation 14 (21)
Goodwill gross, ending balance 5,198 5,185
Accumulated impairment losses, ending balance (28) (28)
Goodwill, ending balance 5,170 5,157
Corporate [Member]
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 1,281 1,293
Goodwill, beginning balance 1,281 1,293
Translation (9) (12)
Goodwill gross, ending balance 1,272 1,281
Goodwill, ending balance 1,272 1,281
Alumina [Member]
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 11 12
Goodwill, beginning balance 11 12
Translation (1) (1)
Goodwill gross, ending balance 10 11
Goodwill, ending balance 10 11
Primary Metals [Member]
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 991 993
Goodwill, beginning balance 991 993
Translation 6 (2)
Goodwill gross, ending balance 997 991
Goodwill, ending balance 997 991
Global Rolled Products [Member]
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 208 207
Goodwill, beginning balance 208 207
Translation 6 1
Goodwill gross, ending balance 214 208
Goodwill, ending balance 214 208
Engineered Products and Solutions [Member]
    
Goodwill [Line Items]    
Goodwill gross, beginning balance 2,694 2,551
Accumulated impairment losses, beginning balance (28) (28)
Goodwill, beginning balance 2,666 2,523
Acquisition of businesses (1) 150
Translation 12 (7)
Goodwill gross, ending balance 2,705 2,694
Accumulated impairment losses, ending balance (28) (28)
Goodwill, ending balance $ 2,677 $ 2,666