Statement of Consolidated Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 187	$ 143
Other comprehensive income, net of tax (J):
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	40	143
Foreign currency translation adjustments	26	122
Net change in unrealized gains on available-for-sale securities	3	0
Net change in unrecognized losses/gains on cash flow hedges	7	(7)
Total Other comprehensive income, net of tax	76	258
Comprehensive income	263	401
Arconic
Net income	187	143
Other comprehensive income, net of tax (J):
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	40	143
Foreign currency translation adjustments	26	122
Net change in unrealized gains on available-for-sale securities	3	0
Net change in unrecognized losses/gains on cash flow hedges	7	(7)
Total Other comprehensive income, net of tax	76	258
Comprehensive income	263	401
Noncontrolling Interests
Net income	0	0
Other comprehensive income, net of tax (J):
Change in unrecognized net actuarial loss and prior service cost/benefit related to pension and other postretirement benefits	0	0
Foreign currency translation adjustments	0	0
Net change in unrealized gains on available-for-sale securities	0	0
Net change in unrecognized losses/gains on cash flow hedges	0	0
Total Other comprehensive income, net of tax	0	0
Comprehensive income	$ 0	$ 0