Segment Information - Disaggregation of Revenue by Major End Market Served (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenue, Major Customer [Line Items]
Sales	$ 1,393	$ 1,195	$ 2,717	$ 2,404
Third-party sales
Revenue, Major Customer [Line Items]
Sales	1,393	1,195	2,717	2,404
Third-party sales | Engine Products
Revenue, Major Customer [Line Items]
Sales	652	544	1,283	1,078
Third-party sales | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	277	262	541	534
Third-party sales | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	185	160	367	336
Third-party sales | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	279	229	526	456
Third-party sales | Aerospace - Commercial
Revenue, Major Customer [Line Items]
Sales	625	468	1,211	923
Third-party sales | Aerospace - Commercial | Engine Products
Revenue, Major Customer [Line Items]
Sales	362	260	691	487
Third-party sales | Aerospace - Commercial | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	155	129	303	277
Third-party sales | Aerospace - Commercial | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	108	79	217	159
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	226	449	496
Third-party sales | Aerospace - Defense | Engine Products
Revenue, Major Customer [Line Items]
Sales	123	121	260	272
Third-party sales | Aerospace - Defense | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	37	41	69	83
Third-party sales | Aerospace - Defense | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	63	64	120	141
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	332	278	632	551
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	53	49	106	95
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	279	229	526	456
Third-party sales | Industrial and Other
Revenue, Major Customer [Line Items]
Sales	213	223	425	434
Third-party sales | Industrial and Other | Engine Products
Revenue, Major Customer [Line Items]
Sales	167	163	332	319
Third-party sales | Industrial and Other | Fastening Systems
Revenue, Major Customer [Line Items]
Sales	32	43	63	79
Third-party sales | Industrial and Other | Engineered Structures
Revenue, Major Customer [Line Items]
Sales	14	17	30	36
Third-party sales | Industrial and Other | Forged Wheels
Revenue, Major Customer [Line Items]
Sales	$ 0	$ 0	$ 0	$ 0