Contingent Liabilities - Additional Information (Detail) € in Millions, Vehicle in Millions, $ in Millions							12 Months Ended
	Mar. 05, 2019 USD ($)	Mar. 05, 2019 EUR (€)	Nov. 22, 2017 USD ($)	Nov. 22, 2017 EUR (€)	Jun. 29, 2016 Vehicle	Jun. 09, 2011 Facility	Dec. 31, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Loss contingency, accrual							$ 210.0
Product liability accrual							$ 62.2	$ 341.0	$ 72.1	$ 95.6
Insurance receivable related to recall								343.0
Damages from Product Defects
Loss Contingencies [Line Items]
Number of vehicles recalled | Vehicle					1.4
Litigation with European Commission
Loss Contingencies [Line Items]
Number of facilities visited | Facility						2
Loss contingency, accrual	$ 203.0	€ 179.0	$ 9.7	€ 8.1
Toyota Recall | Damages from Product Defects
Loss Contingencies [Line Items]
Product liability accrual								25.0
Unannounced Recall | Damages from Product Defects
Loss Contingencies [Line Items]
Product liability accrual								$ 26.0