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Statement of Consolidated Comprehensive Income (Loss) (unaudited) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Net income $ 178 $ 207 $ 189 $ 462
Other comprehensive (loss) income, net of tax (C):        
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits 67 (1) 100 106
Foreign currency translation adjustments 77 229 487 (978)
Net change in unrealized losses/gains on available-for-sale securities 3 (2) 4  
Net change in unrecognized gains/losses on cash flow hedges (137) 430 (219) 366
Total Other comprehensive (loss) income, net of tax 10 656 372 (506)
Comprehensive income 188 863 561 (44)
Alcoa [Member]        
Net income 135 140 151 335
Other comprehensive (loss) income, net of tax (C):        
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits 65 (4) 97 101
Foreign currency translation adjustments 45 197 348 (760)
Net change in unrealized losses/gains on available-for-sale securities 3 (2) 4  
Net change in unrecognized gains/losses on cash flow hedges (153) 434 (233) 370
Total Other comprehensive (loss) income, net of tax (40) 625 216 (289)
Comprehensive income 95 765 367 46
Noncontrolling Interests [Member]        
Net income 43 67 38 127
Other comprehensive (loss) income, net of tax (C):        
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits 2 3 3 5
Foreign currency translation adjustments 32 32 139 (218)
Net change in unrecognized gains/losses on cash flow hedges 16 (4) 14 (4)
Total Other comprehensive (loss) income, net of tax 50 31 156 (217)
Comprehensive income $ 93 $ 98 $ 194 $ (90)