Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenue, Major Customer [Line Items]
Sales	$ 1,658	$ 1,433	$ 4,909	$ 4,150
Third-party sales
Revenue, Major Customer [Line Items]
Sales	1,658	1,433	4,909	4,150
Third-party sales | Engine Products
Revenue, Major Customer [Line Items]
Sales	798	683	2,414	1,966
Third-party sales | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	348	291	989	832
Third-party sales | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	227	193	634	560
Third-party sales | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	285	266	872	792
Third-party sales | Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	820	668	2,345	1,879
Third-party sales | Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	446	388	1,324	1,079
Third-party sales | Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	209	156	563	459
Third-party sales | Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	165	124	458	341
Third-party sales | Aerospace - Commercial | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Third-party sales | Aerospace - Defense
Revenue, Major Customer [Line Items]
Sales	251	223	764	672
Third-party sales | Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	165	124	502	384
Third-party sales | Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	41	43	131	112
Third-party sales | Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	45	56	131	176
Third-party sales | Aerospace - Defense | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Third-party sales | Commercial Transportation
Revenue, Major Customer [Line Items]
Sales	352	329	1,064	961
Third-party sales | Commercial Transportation | Engine Products
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Third-party sales | Commercial Transportation | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	67	63	192	169
Third-party sales | Commercial Transportation | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Third-party sales | Commercial Transportation | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	285	266	872	792
Third-party sales | Industrial and Other
Revenue, Major Customer [Line Items]
Sales	235	213	736	638
Third-party sales | Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	187	171	588	503
Third-party sales | Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	31	29	103	92
Third-party sales | Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	17	13	45	43
Third-party sales | Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0	$ 0