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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period $ 17,361 $ 17,694  
Net adjustment for the period 290 16 $ (60)
Balances at end of period 12,954 17,361 17,694
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period (964) (955) (911)
Balances at end of period (642) (964) (955)
Foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period (956) (970) (901)
Net adjustment for the period 318 14 (69)
Balances at end of period (638) (956) (970)
Realized and unrealized gains (losses) on derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period (4) 15 (11)
Other comprehensive income (loss) before reclassifications, before tax 21 (17) 19
Reclassification to income (12) (1) 11
Net tax impact 1 (1) (4)
Balances at end of period 6 (4) 15
Pension and postretirement plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period (4) 0 1
Reclassification to income (8) (5) (1)
Net tax impact 2 1 0
Balances at end of period $ (10) $ (4) $ 0