Segment and Geographic Area Information - Schedule of Operating Results of Arconic's Reportable Segment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Sales	$ 6,640	$ 5,663	$ 4,972
Restructuring and other (credits) charges	23	56	90
Provision for depreciation and amortization	272	265	270
Capital expenditures	219	193	199
Total assets	10,428	10,255
Third-party sales
Segment Reporting Information [Line Items]
Sales	6,640	5,663	4,972
Inter-segment sales
Segment Reporting Information [Line Items]
Sales	16	10	10
Total segment sales
Segment Reporting Information [Line Items]
Sales	6,656	5,673	4,982
Segment Adjusted EBITDA	1,587	1,352	1,200
Restructuring and other (credits) charges	20	46	90
Provision for depreciation and amortization	262	258	261
Capital expenditures	205	178	182
Total assets	9,814	9,419	9,262
Engine Products | Third-party sales
Segment Reporting Information [Line Items]
Sales	3,266	2,698	2,282
Engine Products | Inter-segment sales
Segment Reporting Information [Line Items]
Sales	13	4	4
Engine Products | Total segment sales
Segment Reporting Information [Line Items]
Sales	3,279	2,702	2,286
Segment Adjusted EBITDA	887	729	564
Restructuring and other (credits) charges	(2)	29	74
Provision for depreciation and amortization	130	125	124
Capital expenditures	112	94	74
Total assets	4,926	4,784	4,663
Fastening Systems | Third-party sales
Segment Reporting Information [Line Items]
Sales	1,349	1,117	1,044
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	1,349	1,117	1,044
Segment Adjusted EBITDA	278	234	239
Restructuring and other (credits) charges	1	8	0
Provision for depreciation and amortization	46	45	49
Capital expenditures	31	39	42
Total assets	2,749	2,661	2,635
Engineered Structures | Third-party sales
Segment Reporting Information [Line Items]
Sales	878	790	725
Engineered Structures | Inter-segment sales
Segment Reporting Information [Line Items]
Sales	3	6	6
Engineered Structures | Total segment sales
Segment Reporting Information [Line Items]
Sales	881	796	731
Segment Adjusted EBITDA	113	111	103
Restructuring and other (credits) charges	21	7	16
Provision for depreciation and amortization	47	48	49
Capital expenditures	26	17	21
Total assets	1,415	1,273	1,280
Forged Wheels | Third-party sales
Segment Reporting Information [Line Items]
Sales	1,147	1,058	921
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	1,147	1,058	921
Segment Adjusted EBITDA	309	278	294
Restructuring and other (credits) charges	0	2	0
Provision for depreciation and amortization	39	40	39
Capital expenditures	36	28	45
Total assets	$ 724	$ 701	$ 684