Segment and Geographic Area Information - Schedule of Operating Results of Arconic's Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Sales	$ 4,972	$ 5,259	$ 7,098
Segment operating profit	748	626	579
Restructuring and other charges	90	182	582
Provision for depreciation and amortization	270	279	295
Capital expenditures	199	267	641
Total Assets	10,219	11,443
Third-party sales
Segment Reporting Information [Line Items]
Sales	4,972	5,257	7,105
Inter-segment sales
Segment Reporting Information [Line Items]
Sales	(10)	(12)	(24)
Total segment sales
Segment Reporting Information [Line Items]
Sales	4,982	5,269	7,129
Segment operating profit	939	890	1,390
Restructuring and other charges	90	106	506
Provision for depreciation and amortization	261	262	269
Capital expenditures	182	158	344
Total Assets	9,262	9,535	10,035
Engine Products | Third-party sales
Segment Reporting Information [Line Items]
Sales	2,282	2,406	3,320
Engine Products | Inter-segment sales
Segment Reporting Information [Line Items]
Sales	4	5	11
Engine Products | Total segment sales
Segment Reporting Information [Line Items]
Sales	2,286	2,411	3,331
Segment operating profit	440	417	621
Restructuring and other charges	74	36	297
Provision for depreciation and amortization	124	123	131
Capital expenditures	74	77	211
Total Assets	4,663	4,756	5,445
Fastening Systems | Third-party sales
Segment Reporting Information [Line Items]
Sales	1,044	1,245	1,561
Fastening Systems | Inter-segment sales
Segment Reporting Information [Line Items]
Sales	0	0	0
Fastening Systems | Total segment sales
Segment Reporting Information [Line Items]
Sales	1,044	1,245	1,561
Segment operating profit	190	247	396
Restructuring and other charges	0	39	6
Provision for depreciation and amortization	49	48	48
Capital expenditures	42	39	36
Total Assets	2,635	2,707	2,810
Engineered Structures | Third-party sales
Segment Reporting Information [Line Items]
Sales	725	927	1,255
Engineered Structures | Inter-segment sales
Segment Reporting Information [Line Items]
Sales	6	7	13
Engineered Structures | Total segment sales
Segment Reporting Information [Line Items]
Sales	731	934	1,268
Segment operating profit	54	73	120
Restructuring and other charges	16	28	199
Provision for depreciation and amortization	49	52	58
Capital expenditures	21	19	27
Total Assets	1,280	1,444	1,151
Forged Wheels | Third-party sales
Segment Reporting Information [Line Items]
Sales	921	679	969
Forged Wheels | Inter-segment sales
Segment Reporting Information [Line Items]
Sales	0	0	0
Forged Wheels | Total segment sales
Segment Reporting Information [Line Items]
Sales	921	679	969
Segment operating profit	255	153	253
Restructuring and other charges	0	3	4
Provision for depreciation and amortization	39	39	32
Capital expenditures	45	23	70
Total Assets	$ 684	$ 628	$ 629