v3.25.2
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     $ 17,361  
Aggregate adjustment for the period $ (133) $ (64) (340) $ (114)
Ending Balance 17,045 17,143 17,045 17,143
AOCI Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (1,128) (1,003) (964) (955)
Ending Balance (1,281) (1,051) (1,281) (1,051)
Foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (1,131) (1,001) (956) (970)
Aggregate adjustment for the period (147) (51) (322) (82)
Ending Balance (1,278) (1,052) (1,278) (1,052)
Realized and unrealized gains (losses) on derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance 9 0 (4) 15
Current period changes in fair value 0 6 16 (14)
Reclassification to income (6) (3) (8) 4
Net tax impact 0 1 (1) (1)
Ending Balance 3 4 3 4
Pension and postretirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (6) (2) (4) 0
Reclassification to income (1) (1) (3) (4)
Net tax impact 1 0 1 1
Ending Balance $ (6) $ (3) $ (6) $ (3)