Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Revenue, Major Customer [Line Items]
Sales	$ 1,824	$ 1,603
Third-party sales
Revenue, Major Customer [Line Items]
Sales	1,824	1,603
Third-party sales | Engine Products
Revenue, Major Customer [Line Items]
Sales	885	795
Third-party sales | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	389	312
Third-party sales | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	262	207
Third-party sales | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	288	289
Third-party sales | Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	928	754
Third-party sales | Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	492	432
Third-party sales | Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	244	170
Third-party sales | Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	192	152
Third-party sales | Aerospace - Commercial | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0
Third-party sales | Aerospace - Defense
Revenue, Major Customer [Line Items]
Sales	280	251
Third-party sales | Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	185	163
Third-party sales | Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	39	44
Third-party sales | Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	56	44
Third-party sales | Aerospace - Defense | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0
Third-party sales | Commercial Transportation
Revenue, Major Customer [Line Items]
Sales	354	352
Third-party sales | Commercial Transportation | Engine Products
Revenue, Major Customer [Line Items]
Sales	0	0
Third-party sales | Commercial Transportation | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	66	63
Third-party sales | Commercial Transportation | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	0	0
Third-party sales | Commercial Transportation | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	288	289
Third-party sales | Industrial and Other
Revenue, Major Customer [Line Items]
Sales	262	246
Third-party sales | Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	208	200
Third-party sales | Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	40	35
Third-party sales | Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	14	11
Third-party sales | Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0