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Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables)
6 Months Ended
Mar. 31, 2023
Regulated Operations [Abstract]  
Schedule of Regulatory Assets The following regulatory assets and liabilities associated with Utilities are included on the Condensed Consolidated Balance Sheets:
March 31,
2023
September 30,
2022
March 31,
2022
Regulatory assets (a):
Income taxes recoverable$94 $83 $148 
Underfunded pension plans118 114 104 
Environmental costs34 37 55 
Deferred fuel and power costs38 32 
Removal costs, net22 22 22 
Other53 52 49 
Total regulatory assets$359 $340 $384 
Regulatory liabilities (a):
Postretirement benefit overcollections$10 $11 $12 
Deferred fuel and power refunds28 17 
State tax benefits — distribution system repairs39 38 34 
Excess federal deferred income taxes262 279 283 
Other14 
Total regulatory liabilities$345 $335 $360 
(a)Current regulatory assets are included in “Prepaid expenses and other current assets” and regulatory liabilities are included in “Other current liabilities” and “Other noncurrent liabilities” on the Condensed Consolidated Balance Sheets.
Schedule of Regulatory Liabilities The following regulatory assets and liabilities associated with Utilities are included on the Condensed Consolidated Balance Sheets:
March 31,
2023
September 30,
2022
March 31,
2022
Regulatory assets (a):
Income taxes recoverable$94 $83 $148 
Underfunded pension plans118 114 104 
Environmental costs34 37 55 
Deferred fuel and power costs38 32 
Removal costs, net22 22 22 
Other53 52 49 
Total regulatory assets$359 $340 $384 
Regulatory liabilities (a):
Postretirement benefit overcollections$10 $11 $12 
Deferred fuel and power refunds28 17 
State tax benefits — distribution system repairs39 38 34 
Excess federal deferred income taxes262 279 283 
Other14 
Total regulatory liabilities$345 $335 $360 
(a)Current regulatory assets are included in “Prepaid expenses and other current assets” and regulatory liabilities are included in “Other current liabilities” and “Other noncurrent liabilities” on the Condensed Consolidated Balance Sheets.