Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenue, Major Customer [Line Items]
Sales	$ 2,053	$ 1,880	$ 3,995	$ 3,704
Engine Products
Revenue, Major Customer [Line Items]
Sales	1,056	933	2,052	1,818
Fastening Systems
Revenue, Major Customer [Line Items]
Sales	431	394	843	783
Engineered Structures
Revenue, Major Customer [Line Items]
Sales	290	275	572	537
Forged Wheels
Revenue, Major Customer [Line Items]
Sales	276	278	528	566
Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	1,060	979	2,076	1,907
Aerospace - Commercial \| Engine Products
Revenue, Major Customer [Line Items]
Sales	574	528	1,123	1,020
Aerospace - Commercial \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	297	251	572	495
Aerospace - Commercial \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	189	200	381	392
Aerospace - Commercial \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Aerospace - Defense
Revenue, Major Customer [Line Items]
Sales	352	290	685	570
Aerospace - Defense \| Engine Products
Revenue, Major Customer [Line Items]
Sales	217	192	432	377
Aerospace - Defense \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	44	37	86	76
Aerospace - Defense \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	91	61	167	117
Aerospace - Defense \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Commercial Transportation
Revenue, Major Customer [Line Items]
Sales	332	346	637	700
Commercial Transportation \| Engine Products
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Commercial Transportation \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	56	68	109	134
Commercial Transportation \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Commercial Transportation \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	276	278	528	566
Industrial and Other
Revenue, Major Customer [Line Items]
Sales	309	265	597	527
Industrial and Other \| Engine Products
Revenue, Major Customer [Line Items]
Sales	265	213	497	421
Industrial and Other \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	34	38	76	78
Industrial and Other \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	10	14	24	28
Industrial and Other \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0	$ 0