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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