Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue, Major Customer [Line Items]
Sales	$ 1,648	$ 1,393	$ 3,251	$ 2,717
Third-party sales
Revenue, Major Customer [Line Items]
Sales	1,648	1,393	3,251	2,717
Third-party sales | Engine Products
Revenue, Major Customer [Line Items]
Sales	821	652	1,616	1,283
Third-party sales | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	329	277	641	541
Third-party sales | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	200	185	407	367
Third-party sales | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	298	279	587	526
Third-party sales | Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	771	625	1,525	1,211
Third-party sales | Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	446	362	878	691
Third-party sales | Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	184	155	354	303
Third-party sales | Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	141	108	293	217
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	262	223	513	449
Third-party sales | Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	174	123	337	260
Third-party sales | Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	46	37	90	69
Third-party sales | Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	42	63	86	120
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	360	332	712	632
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	62	53	125	106
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	298	279	587	526
Third-party sales | Industrial and Other
Revenue, Major Customer [Line Items]
Sales	255	213	501	425
Third-party sales | Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	201	167	401	332
Third-party sales | Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	37	32	72	63
Third-party sales | Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	17	14	28	30
Third-party sales | Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0	$ 0