Restructuring and Other Charges - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($) employee
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 9	$ 39
Settlements	3	0
Accelerated depreciation	1
Gain (loss) on sale of assets		2
Pension benefits
Restructuring Cost and Reserve [Line Items]
Settlements	3	0
Pension benefits | U.K. Forging Business
Restructuring Cost and Reserve [Line Items]
Settlements		12
Asset Impairment Associated With Facility Closure | France Small Business
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	4
U.S. Pension Plan Settlement Accounting | Pension benefits
Restructuring Cost and Reserve [Line Items]
Settlements	3
Reversal of prior period programs
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	1	(2)
Layoff costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges	$ 4	$ 22
Number of employees associated with layoff costs | employee		460
Layoff costs | Corporate expense
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		23
Layoff costs | Engine Products
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		175
Layoff costs | Fastening Systems
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		106
Layoff costs | Engineered Structures
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		100
Layoff costs | Forged Wheels
Restructuring Cost and Reserve [Line Items]
Number of employees associated with layoff costs | employee		56
Executive severance | U.K. Forging Business
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 6
Employee severance, life insurance benefits
Restructuring Cost and Reserve [Line Items]
Restructuring and other charges		$ 3