Statement of Consolidated Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Net income	$ 161	$ 119	$ 424	$ 653
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	37	31	209	110
Foreign currency translation adjustments	(16)	85	(95)	251
Net change in unrealized gains on available-for-sale securities	1	1	(1)	(133)
Net change in unrecognized losses/gains on cash flow hedges	(10)	10	(13)	13
Total Other comprehensive income, net of tax	12	127	100	241
Comprehensive income	173	246	524	894
Arconic
Net income	161	119	424	653
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	37	31	209	110
Foreign currency translation adjustments	(16)	85	(95)	251
Net change in unrealized gains on available-for-sale securities	1	1	(1)	(133)
Net change in unrecognized losses/gains on cash flow hedges	(10)	10	(13)	13
Total Other comprehensive income, net of tax	12	127	100	241
Comprehensive income	173	246	524	894
Noncontrolling Interests
Net income	0	0	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	0	0
Foreign currency translation adjustments	0	0	0	0
Net change in unrealized gains on available-for-sale securities	0	0	0	0
Net change in unrecognized losses/gains on cash flow hedges	0	0	0	0
Total Other comprehensive income, net of tax	0	0	0	0
Comprehensive income	$ 0	$ 0	$ 0	$ 0