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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax      
Balance, beginning of year $ 4,354 $ 4,394  
Other comprehensive income (loss) before reclassification adjustments 82 35 $ 153
Amounts reclassified from AOCI (2) (32) (29)
Other comprehensive income 80 3 124
Balance, ending of year 4,786 4,354 4,394
Accumulated other comprehensive income (loss)      
AOCI Attributable to Parent, Net of Tax      
Balance, beginning of year (253) (256) (380)
Balance, ending of year (173) (253) (256)
Postretirement Benefit Plans      
AOCI Attributable to Parent, Net of Tax      
Balance, beginning of year 10 17 14
Other comprehensive income (loss) before reclassification adjustments 13 (7) 5
Amounts reclassified from AOCI 0 0 (2)
Other comprehensive income 13 (7) 3
Balance, ending of year 23 10 17
Derivative Instruments      
AOCI Attributable to Parent, Net of Tax      
Balance, beginning of year (23) 26 37
Other comprehensive income (loss) before reclassification adjustments 10 (14) 16
Amounts reclassified from AOCI (2) (35) (27)
Other comprehensive income 8 (49) (11)
Balance, ending of year (15) (23) 26
Foreign Currency      
AOCI Attributable to Parent, Net of Tax      
Balance, beginning of year (240) (299) (431)
Other comprehensive income (loss) before reclassification adjustments 59 56 132
Amounts reclassified from AOCI 0 3 0
Other comprehensive income 59 59 132
Balance, ending of year $ (181) $ (240) $ (299)