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Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated other comprehensive (loss) income, beginning balance $ (1,548) $ (1,488) $ (2,088)
Other comprehensive income before reclassifications, net of taxes (227) (106) 306
Amounts reclassified into income, net of taxes 42 46 43
Stockholders' equity note, spinoff transaction     251
Accumulated other comprehensive (loss) income, ending balance (1,732) (1,548) (1,488)
Foreign Currency Translation      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated other comprehensive (loss) income, beginning balance (1,078) (987) (1,292)
Other comprehensive income before reclassifications, net of taxes (166) (91) 54
Amounts reclassified into income, net of taxes 0 0 0
Stockholders' equity note, spinoff transaction     251
Accumulated other comprehensive (loss) income, ending balance (1,244) (1,078) (987)
Benefit Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated other comprehensive (loss) income, beginning balance (571) (574) (784)
Other comprehensive income before reclassifications, net of taxes (32) (37) 169
Amounts reclassified into income, net of taxes 46 41 41
Stockholders' equity note, spinoff transaction     0
Accumulated other comprehensive (loss) income, ending balance (557) (571) (574)
Cash Flow Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated other comprehensive (loss) income, beginning balance 103 75 (10)
Other comprehensive income before reclassifications, net of taxes (28) 21 83
Amounts reclassified into income, net of taxes (4) 6 2
Stockholders' equity note, spinoff transaction     0
Accumulated other comprehensive (loss) income, ending balance 70 103 75
Available-for-Sale Debt Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Accumulated other comprehensive (loss) income, beginning balance 0 0 0
Other comprehensive income before reclassifications, net of taxes (1) 0 0
Amounts reclassified into income, net of taxes 0 0 0
Stockholders' equity note, spinoff transaction     0
Accumulated other comprehensive (loss) income, ending balance $ (1) $ 0 $ 0