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Product Warranties (Tables)
12 Months Ended
Sep. 30, 2020
Product Warranties Disclosures [Abstract]  
Schedule of product warranty liability
The changes in Adient's total product warranty liability are as follows:
September 30,
(in millions)20202019
Balance at beginning of period$22 $11 
Accruals for warranties issued during the period11 
Changes in accruals related to pre-existing warranties (including changes in estimates)
Changes in accruals related to business divestitures(1)— 
Settlements made (in cash or in kind) during the period(7)(6)
Balance at end of period$24 $22