Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Revenue, Major Customer [Line Items]
Sales	$ 1,433	$ 1,283	$ 4,150	$ 3,687
Third-party sales
Revenue, Major Customer [Line Items]
Sales	1,433	1,283	4,150	3,687
Third-party sales | Engine Products
Revenue, Major Customer [Line Items]
Sales	683	599	1,966	1,677
Third-party sales | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	291	254	832	788
Third-party sales | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	193	199	560	535
Third-party sales | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	266	231	792	687
Third-party sales | Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	668	543	1,879	1,466
Third-party sales | Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	388	299	1,079	786
Third-party sales | Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	156	126	459	403
Third-party sales | Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	124	118	341	277
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	223	232	672	728
Third-party sales | Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	124	130	384	402
Third-party sales | Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	43	37	112	120
Third-party sales | Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	56	65	176	206
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	329	290	961	841
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	63	59	169	154
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	266	231	792	687
Third-party sales | Industrial and Other
Revenue, Major Customer [Line Items]
Sales	213	218	638	652
Third-party sales | Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	171	170	503	489
Third-party sales | Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	29	32	92	111
Third-party sales | Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	13	16	43	52
Third-party sales | Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0	$ 0