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Accumulated Other Comprehensive Income (Loss) ("AOCI") - Amounts Reclassified Out of AOCI (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax $ (2)   $ (5) $ 32
(Gains) Losses Reclassified to Interest Expense [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax (1) $ (1) (4) (4)
(Gains) Losses Excluded from Effectiveness Testing and Amortized to Interest Expense [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax     1 1
Release of Currency Translation Adjustment [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax       33
Release of Actuarial Losses and Prior Service Cost (Credit) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax       1
Amortization of Actuarial Losses and Prior Service Cost (Credit) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total before tax $ (1) $ 1 $ (2) $ 1