Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenue, Major Customer [Line Items]
Sales	$ 2,089	$ 1,835	$ 6,084	$ 5,539
Engine Products
Revenue, Major Customer [Line Items]
Sales	1,105	945	3,157	2,763
Fastening Systems
Revenue, Major Customer [Line Items]
Sales	448	392	1,291	1,175
Engineered Structures
Revenue, Major Customer [Line Items]
Sales	289	253	861	790
Forged Wheels
Revenue, Major Customer [Line Items]
Sales	247	245	775	811
Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	1,109	962	3,185	2,869
Aerospace - Commercial \| Engine Products
Revenue, Major Customer [Line Items]
Sales	603	534	1,726	1,554
Aerospace - Commercial \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	310	245	882	740
Aerospace - Commercial \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	196	183	577	575
Aerospace - Commercial \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Aerospace - Defense
Revenue, Major Customer [Line Items]
Sales	357	289	1,042	859
Aerospace - Defense \| Engine Products
Revenue, Major Customer [Line Items]
Sales	232	189	664	566
Aerospace - Defense \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	44	43	130	119
Aerospace - Defense \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	81	57	248	174
Aerospace - Defense \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Commercial Transportation
Revenue, Major Customer [Line Items]
Sales	301	310	938	1,010
Commercial Transportation \| Engine Products
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Commercial Transportation \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	54	65	163	199
Commercial Transportation \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Commercial Transportation \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	247	245	775	811
Industrial Gas Turbine
Revenue, Major Customer [Line Items]
Sales	152	124	431	359
Industrial Gas Turbine \| Engine Products
Revenue, Major Customer [Line Items]
Sales	152	124	431	359
Industrial Gas Turbine \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Industrial Gas Turbine \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Industrial Gas Turbine \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Oil and Gas
Revenue, Major Customer [Line Items]
Sales	89	67	247	195
Oil and Gas \| Engine Products
Revenue, Major Customer [Line Items]
Sales	89	67	247	195
Oil and Gas \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Oil and Gas \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
Oil and Gas \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	0	0	0	0
General Industrial
Revenue, Major Customer [Line Items]
Sales	81	83	241	247
General Industrial \| Engine Products
Revenue, Major Customer [Line Items]
Sales	29	31	89	89
General Industrial \| Fastening Systems
Revenue, Major Customer [Line Items]
Sales	40	39	116	117
General Industrial \| Engineered Structures
Revenue, Major Customer [Line Items]
Sales	12	13	36	41
General Industrial \| Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0	$ 0