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Utility Regulatory Assets and Liabilities and Regulatory Matters (Tables)
 12 Months Ended
Sep. 30, 2025
Regulated Operations [Abstract]  
Schedule of Regulatory Assets
The following regulatory assets and liabilities associated with our Utilities reportable segment are included in our Consolidated Balance Sheets at September 30:
20252024
Regulatory assets (a):  
Income taxes recoverable$113 $105 
Underfunded pension plans100 106 
Environmental costs22 28 
Deferred fuel and power costs39 — 
Removal costs, net30 28 
Other36 52 
Total regulatory assets$340 $319 
Regulatory liabilities (a):  
Postretirement benefits$14 $13 
Deferred fuel and power refunds4 17 
State income tax benefits — distribution system repairs49 44 
Excess federal deferred income taxes239 247 
Other8 8 
Total regulatory liabilities$314 $329 
(a)    Regulatory assets are recorded in “Other current assets” and “Other assets” on the Consolidated Balance Sheets. Regulatory liabilities are recorded in “Other current liabilities” and “Other noncurrent liabilities” on the Consolidated Balance Sheets.
Schedule of Regulatory Liabilities
The following regulatory assets and liabilities associated with our Utilities reportable segment are included in our Consolidated Balance Sheets at September 30:
20252024
Regulatory assets (a):  
Income taxes recoverable$113 $105 
Underfunded pension plans100 106 
Environmental costs22 28 
Deferred fuel and power costs39 — 
Removal costs, net30 28 
Other36 52 
Total regulatory assets$340 $319 
Regulatory liabilities (a):  
Postretirement benefits$14 $13 
Deferred fuel and power refunds4 17 
State income tax benefits — distribution system repairs49 44 
Excess federal deferred income taxes239 247 
Other8 8 
Total regulatory liabilities$314 $329 
(a)    Regulatory assets are recorded in “Other current assets” and “Other assets” on the Consolidated Balance Sheets. Regulatory liabilities are recorded in “Other current liabilities” and “Other noncurrent liabilities” on the Consolidated Balance Sheets.