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Statement of Consolidated Comprehensive Income (Loss) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Net income (loss) $ 207 $ 129 $ 462 $ (68)
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 (1) 15 106 92
Foreign currency translation adjustments 229 200 (978) 536
Net change in unrealized gains on available-for-sale securities (2) 1   1
Net change in unrecognized losses on cash flow hedges 430 (31) 366 3
Total Other comprehensive (loss) income, net of tax 656 185 (506) 632
Comprehensive income (loss) 863 314 (44) 564
Alcoa [Member]        
Net income (loss) 140 138 335 (40)
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 (4) 14 101 91
Foreign currency translation adjustments 197 141 (760) 390
Net change in unrealized gains on available-for-sale securities (2) 1   1
Net change in unrecognized losses on cash flow hedges 434 (23) 370 9
Total Other comprehensive (loss) income, net of tax 625 133 (289) 491
Comprehensive income (loss) 765 271 46 451
Noncontrolling Interests [Member]        
Net income (loss) 67 (9) 127 (28)
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 3 1 5 1
Foreign currency translation adjustments 32 59 (218) 146
Net change in unrecognized losses on cash flow hedges (4) (8) (4) (6)
Total Other comprehensive (loss) income, net of tax 31 52 (217) 141
Comprehensive income (loss) $ 98 $ 43 $ (90) $ 113