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Name:	us-gaap_ErrorCorrectionsAndPriorPeriodAdjustmentsRestatementLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Summary of Accounting Policies - Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019
Motorparts
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prior period reclassification	$ 15		$ 7
Ride Performance
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Prior period reclassification		$ 5