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Shareholders' Equity - Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Millions
 12 Months Ended
Oct. 31, 2020
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Accumulated other comprehensive (loss) income, beginning balance   $ (1,488) $ (2,088) $ (2,548)
Other comprehensive income before reclassifications, net of taxes   (106) 306 383
Amounts reclassified into income, net of taxes   46 43 77
Stockholders' Equity Note, Spinoff Transaction     251  
Accumulated other comprehensive (loss) income, ending balance   (1,548) (1,488) (2,088)
Foreign Currency Translation        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Accumulated other comprehensive (loss) income, beginning balance   (987) (1,292) (1,416)
Other comprehensive income before reclassifications, net of taxes   (91) 54 124
Amounts reclassified into income, net of taxes   0 0 0
Stockholders' Equity Note, Spinoff Transaction     251  
Accumulated other comprehensive (loss) income, ending balance   (1,078) (987) (1,292)
Benefit Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Accumulated other comprehensive (loss) income, beginning balance   (574) (784) (1,040)
Other comprehensive income before reclassifications, net of taxes $ 24 (37) 169 187
Amounts reclassified into income, net of taxes   41 41 68
Stockholders' Equity Note, Spinoff Transaction     0  
Accumulated other comprehensive (loss) income, ending balance   (571) (574) (784)
Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Accumulated other comprehensive (loss) income, beginning balance   75 (10) (91)
Other comprehensive income before reclassifications, net of taxes   21 83 72
Amounts reclassified into income, net of taxes   6 2 9
Stockholders' Equity Note, Spinoff Transaction     0  
Accumulated other comprehensive (loss) income, ending balance   $ 103 $ 75 $ (10)