Restructuring and Other Credits - Activity and Reserve Balances for Restructuring Charges (Details) $ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($)
Restructuring Reserve [Roll Forward]
Reserve balance at beginning of period	$ 1
Restructuring credits	(93)
Other	93
Reserve balance at end of period	1
Disposed by Sale | Disk Forging Facility
Restructuring Cost and Reserve [Line Items]
Gain from disposal of business	93
Layoff costs
Restructuring Reserve [Roll Forward]
Reserve balance at beginning of period	1
Restructuring credits	0
Other	0
Reserve balance at end of period	1
Other exit costs
Restructuring Reserve [Roll Forward]
Reserve balance at beginning of period	0
Restructuring credits	(93)
Other	93
Reserve balance at end of period	$ 0