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Accumulated Other Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance $ 17,361  
Aggregate adjustment for the period (135) $ 19
Ending Balance 17,130 17,874
AOCI Attributable to Parent    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (964) (955)
Ending Balance (1,044) (933)
Foreign currency translation adjustments    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (956) (970)
Aggregate adjustment for the period (85) 61
Ending Balance (1,041) (909)
Realized and unrealized gains (losses) on derivatives    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (4) 15
Current period changes in fair value 8 (43)
Reclassification to income (1) 4
Net tax impact (1) 1
Ending Balance 2 (23)
Pension and postretirement plans    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (4) 0
Reclassification to income (1) (1)
Ending Balance $ (5) $ (1)