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Product Warranties (Tables)
9 Months Ended
Jun. 30, 2021
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability The changes in Adient's total product warranty liability are as follows:
Nine Months Ended
June 30,
(in millions)20212020
Balance at beginning of period$24 $22 
Accruals for warranties issued during the period
Changes in accruals related to pre-existing warranties (including changes in estimates)(1)(1)
Settlements made (in cash or in kind) during the period(6)(5)
Balance at end of period$24 $25