Segment Information - Operating Results of Reportable Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Sales:
Sales	$ 2,547	$ 2,053	$ 4,860	$ 3,995
Profit and loss:
Provision for depreciation and amortization	84	69	158	138
Restructuring and other charges (credits)	0	0	(93)	(4)
Other:
Capital expenditures	104	102	198	221
Total assets	13,251		13,251		$ 11,179
Engine Products
Sales:
Sales	1,373	1,038	2,626	2,012
Fastening Systems
Sales:
Sales	589	431	1,060	843
Engineered Structures
Sales:
Sales	269	308	563	612
Forged Wheels
Sales:
Sales	316	276	611	528
Inter-segment sales
Sales:
Sales	11	11	21	20
Inter-segment sales | Engine Products
Sales:
Sales	3	3	5	5
Inter-segment sales | Fastening Systems
Sales:
Sales	0	0	0	0
Inter-segment sales | Engineered Structures
Sales:
Sales	8	8	16	15
Inter-segment sales | Forged Wheels
Sales:
Sales	0	0	0	0
Total segment capital expenditures
Sales:
Sales	2,558	2,064	4,881	4,015
Expenses:
Segment Adjusted cost of goods sold	1,624	1,375	3,099	2,674
Other segment items	88	76	172	148
Profit and loss:
Segment Adjusted EBITDA	846	613	1,610	1,193
Provision for depreciation and amortization	83	67	155	135
Restructuring and other charges (credits)		0	(93)	(4)
Other:
Capital expenditures	100	98	191	214
Total assets	12,595	10,421	12,595	10,421
Total segment capital expenditures | Engine Products
Sales:
Sales	1,376	1,041	2,631	2,017
Expenses:
Segment Adjusted cost of goods sold	831	671	1,596	1,304
Other segment items	28	27	60	52
Profit and loss:
Segment Adjusted EBITDA	517	343	975	661
Provision for depreciation and amortization	42	35	80	68
Restructuring and other charges (credits)		0	0	0
Other:
Capital expenditures	77	74	136	159
Total assets	5,777	5,512	5,777	5,512
Total segment capital expenditures | Fastening Systems
Sales:
Sales	589	431	1,060	843
Expenses:
Segment Adjusted cost of goods sold	373	276	662	532
Other segment items	39	29	71	58
Profit and loss:
Segment Adjusted EBITDA	177	126	327	253
Provision for depreciation and amortization	20	12	33	24
Restructuring and other charges (credits)		1	0	1
Other:
Capital expenditures	11	9	28	19
Total assets	4,756	2,787	4,756	2,787
Total segment capital expenditures | Engineered Structures
Sales:
Sales	277	316	579	627
Expenses:
Segment Adjusted cost of goods sold	204	239	430	475
Other segment items	9	9	19	17
Profit and loss:
Segment Adjusted EBITDA	64	68	130	135
Provision for depreciation and amortization	11	10	21	23
Restructuring and other charges (credits)		0	(93)	(4)
Other:
Capital expenditures	8	7	20	13
Total assets	1,277	1,374	1,277	1,374
Total segment capital expenditures | Forged Wheels
Sales:
Sales	316	276	611	528
Expenses:
Segment Adjusted cost of goods sold	216	189	411	363
Other segment items	12	11	22	21
Profit and loss:
Segment Adjusted EBITDA	88	76	178	144
Provision for depreciation and amortization	10	10	21	20
Restructuring and other charges (credits)		(1)	0	(1)
Other:
Capital expenditures	4	8	7	23
Total assets	$ 785	$ 748	$ 785	$ 748