Acquisitions and Divestitures - Narrative (Details) $ in Millions			3 Months Ended	5 Months Ended	6 Months Ended		12 Months Ended
	Apr. 06, 2026 USD ($)	Feb. 06, 2026 USD ($)	Mar. 31, 2026 USD ($)	Jun. 30, 2026	Jun. 30, 2026 USD ($)	Jun. 30, 2025 USD ($)	Dec. 31, 2025 USD ($) employee
Disposal Group, Including Discontinued Operations [Line Items]
Acquisitions, net of cash acquired					$ 1,929	$ 0
Disposed by Sale | Disk Forging Facility
Disposal Group, Including Discontinued Operations [Line Items]
Divestiture, consideration			$ 230
Proceeds from the sales of businesses			225
Gain from disposal of business			93		$ 93
Net assets			92
Reduction in goodwill from sale of business			$ 41
Sales							$ 130
Number of employees at the time of divestiture | employee							160
CAM
Disposal Group, Including Discontinued Operations [Line Items]
Acquisitions, net of cash acquired	$ 1,812
Cash acquired	$ 1
Brunner
Disposal Group, Including Discontinued Operations [Line Items]
Acquisitions, net of cash acquired		$ 120
Cash acquired		$ 2
CAM and Brunner
Disposal Group, Including Discontinued Operations [Line Items]
Acquiree's revenue since acquisition date, actual (in percent)				2.00%
Acquiree's net income since acquisition date, actual (in percent)				1.00%