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Contingent Liabilities - Additional Information (Detail) € in Millions, Airbags in Millions, $ in Millions		3 Months Ended	6 Months Ended
	Oct. 31, 2024 EUR (€)	Dec. 31, 2020 Vehicle	Jun. 30, 2025 USD ($) Vehicle	Mar. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Oct. 31, 2024 USD ($)	Oct. 31, 2024 EUR (€)	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Sep. 05, 2023 Airbags
Loss Contingencies [Line Items]
Product liability insurance receivable			$ 69	$ 71	$ 65			$ 73	$ 78	$ 96
Insurance receivable related to recall			56
Recall of frontal driver and passenger air bag | Airbags | Airbags											52
Stellantis | Maximum
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued			385
Stellantis | Minimum
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued			$ 0
Stellantis | Damages from Product Defects
Loss Contingencies [Line Items]
Number of vehicles recalled | Vehicle			250,000
Honda Buckle Recall | Damages from Product Defects
Loss Contingencies [Line Items]
Number of vehicles recalled | Vehicle		449,000
Unannounced Recall | Damages from Product Defects
Loss Contingencies [Line Items]
Product liability insurance receivable			$ 12
ZF Inflator Recall | Maximum
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued			43
ZF Inflator Recall | Minimum
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued			$ 0
ZF Inflator Recall | Global
Loss Contingencies [Line Items]
Number of vehicles recalled | Vehicle			762,000
ZF Inflator Recall | Damages from Product Defects
Loss Contingencies [Line Items]
Product liability insurance receivable			$ 0
BMW Complaint [Member]
Loss Contingencies [Line Items]
Product liability insurance receivable						$ 0
Description of antitrust matters			The Company has determined pursuant to ASC 450 that a loss is reasonably possible with respect to the BMW Complaint.
Claiming damages and interest | €							€ 95
Claiming damages charges | €	€ 63
BMW Complaint [Member] | Maximum
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued | €							95
BMW Complaint [Member] | Minimum
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Portion Not Accrued | €							€ 0

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