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SCHEDULE I — CONDENSED FINANCIAL INFORMATION OF REGISTRANT (PARENT COMPANY) - STATEMENTS OF CASH FLOWS (Details) - USD ($)
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Condensed Financial Statements, Captions [Line Items]      
NET CASH PROVIDED BY OPERATING ACTIVITIES $ 1,227,000,000 $ 1,182,000,000 $ 1,107,000,000
CASH FLOWS FROM INVESTING ACTIVITIES      
Net cash provided (used) by investing activities (699,000,000) (792,000,000) (1,077,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES      
Dividends on Common Stock (322,000,000) (318,000,000) (308,000,000)
Issuances of debt, net of issuance costs 1,684,000,000 1,321,000,000 1,930,000,000
Issuances of Common Stock 18,000,000 0 12,000,000
Repurchases of Common Stock (33,000,000) 0 (22,000,000)
Net cash provided (used) by financing activities (406,000,000) (506,000,000) (168,000,000)
Cash, cash equivalents and restricted cash increase (decrease) 127,000,000 (112,000,000) (129,000,000)
Cash and cash equivalents:      
Cash, cash equivalents and restricted cash at end of year 355,000,000 228,000,000 340,000,000
Cash, cash equivalents and restricted cash at beginning of year 228,000,000 340,000,000 469,000,000
Cash and cash equivalents increase (decrease) 127,000,000 (112,000,000) (129,000,000)
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
NET CASH PROVIDED BY OPERATING ACTIVITIES 339,000,000 379,000,000 636,000,000
CASH FLOWS FROM INVESTING ACTIVITIES      
Net investments in unconsolidated subsidiaries (30,000,000) (355,000,000) (309,000,000)
Net cash provided (used) by investing activities (30,000,000) (355,000,000) (309,000,000)
CASH FLOWS FROM FINANCING ACTIVITIES      
Dividends on Common Stock (322,000,000) (318,000,000) (308,000,000)
Issuances of debt, net of issuance costs 898,000,000 1,078,000,000 327,000,000
Repayments of long-term debt (870,000,000) (775,000,000) (333,000,000)
Issuances of Common Stock 18,000,000 0 12,000,000
Repurchases of Common Stock (33,000,000) 0 (22,000,000)
Payments on Purchase Contracts 0 (12,000,000) (16,000,000)
Net cash provided (used) by financing activities (309,000,000) (27,000,000) (340,000,000)
Cash, cash equivalents and restricted cash increase (decrease) 0 (3,000,000) (13,000,000)
Cash and cash equivalents:      
Cash, cash equivalents and restricted cash at end of year 4,000,000 4,000,000 7,000,000
Cash, cash equivalents and restricted cash at beginning of year 4,000,000 7,000,000 20,000,000
Cash and cash equivalents increase (decrease) 0 (3,000,000) (13,000,000)
Dividends from unconsolidated subsidiaries $ 466,000,000 $ 420,000,000 $ 680,000,000