Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Revenue, Major Customer [Line Items]
Sales	$ 1,880	$ 1,648	$ 3,704	$ 3,251
Third-party sales
Revenue, Major Customer [Line Items]
Sales	1,880	1,648	3,704	3,251
Third-party sales | Engine Products
Revenue, Major Customer [Line Items]
Sales	933	821	1,818	1,616
Third-party sales | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	394	329	783	641
Third-party sales | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	275	200	537	407
Third-party sales | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	278	298	566	587
Third-party sales | Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	979	771	1,907	1,525
Third-party sales | Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	528	446	1,020	878
Third-party sales | Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	251	184	495	354
Third-party sales | Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	200	141	392	293
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	290	262	570	513
Third-party sales | Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	192	174	377	337
Third-party sales | Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	37	46	76	90
Third-party sales | Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	61	42	117	86
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	346	360	700	712
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	68	62	134	125
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	278	298	566	587
Third-party sales | Industrial and Other
Revenue, Major Customer [Line Items]
Sales	265	255	527	501
Third-party sales | Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	213	201	421	401
Third-party sales | Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	38	37	78	72
Third-party sales | Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	14	17	28	28
Third-party sales | Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0	$ 0