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Statement of Consolidated Comprehensive Income (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net income $ 170 $ 99
Other comprehensive income, net of tax (B):    
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits 96 58
Foreign currency translation adjustments (100) 309
Net change in unrealized gains on available-for-sale securities 1 2
Net change in unrecognized losses on derivatives 115 (83)
Total Other comprehensive income, net of tax 112 286
Comprehensive income 282 385
Alcoa [Member]
    
Net income 149 94
Other comprehensive income, net of tax (B):    
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits 95 56
Foreign currency translation adjustments (116) 244
Net change in unrealized gains on available-for-sale securities 1 2
Net change in unrecognized losses on derivatives 113 (81)
Total Other comprehensive income, net of tax 93 221
Comprehensive income 242 315
Noncontrolling Interests [Member]
    
Net income 21 5
Other comprehensive income, net of tax (B):    
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits 1 2
Foreign currency translation adjustments 16 65
Net change in unrecognized losses on derivatives 2 (2)
Total Other comprehensive income, net of tax 19 65
Comprehensive income $ 40 $ 70