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Shareholders' Equity - Accumulated Other Comprehensive Income (Loss) - Components and Changes of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ (1,548) | $ (1,488)
Other comprehensive income (loss) before reclassifications, net of taxes | 21 | (84)
Amounts reclassified into income, net of taxes | 12 | 12
Ending balance | (1,515) | (1,559)
Foreign Currency Translation |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (1,078) | (987)
Other comprehensive income (loss) before reclassifications, net of taxes | 40 | (80)
Amounts reclassified into income, net of taxes | 0 | 0
Ending balance | (1,038) | (1,067)
Benefit Plans |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (571) | (574)
Other comprehensive income (loss) before reclassifications, net of taxes | 0 | 0
Amounts reclassified into income, net of taxes | 12 | 11
Ending balance | (559) | (563)
Cash Flow Hedges |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 103 | 75
Other comprehensive income (loss) before reclassifications, net of taxes | (19) | (4)
Amounts reclassified into income, net of taxes | 1 | 1
Ending balance | $ 84 | $ 73

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