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Derivative Instruments and Hedging Activities - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Cash flow hedges $ 37,000,000 $ (34,000,000) $ 74,000,000 $ 78,000,000  
Interest Rate Swap | Cash flow hedges          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Cash flow hedges 37,000,000 $ (34,000,000) 77,000,000 $ 71,000,000  
Derivative Notional Amount Terminated 500,000,000   500,000,000    
Notional amount of derivative 500,000,000   500,000,000   $ 1,000,000,000
Terminated Interest Rate Swap | Cash flow hedges          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Cash flow hedges $ 41,000,000   $ 41,000,000    
Commodity Contract | Cash flow hedges          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Notional amount of derivative         $ 0