Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue, Major Customer [Line Items]
Sales	$ 1,324	$ 1,209
Third-party sales
Revenue, Major Customer [Line Items]
Sales	1,324	1,209
Third-party sales | Engine Products
Revenue, Major Customer [Line Items]
Sales	631	534
Third-party sales | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	264	272
Third-party sales | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	182	176
Third-party sales | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	247	227
Third-party sales | Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	586	455
Third-party sales | Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	329	227
Third-party sales | Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	148	148
Third-party sales | Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	109	80
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	226	270
Third-party sales | Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	137	151
Third-party sales | Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	32	42
Third-party sales | Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	57	77
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	300	273
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	53	46
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	247	227
Third-party sales | Industrial and Other
Revenue, Major Customer [Line Items]
Sales	212	211
Third-party sales | Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	165	156
Third-party sales | Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	31	36
Third-party sales | Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	16	19
Third-party sales | Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0