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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)

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