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Equity - Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period $ 17,694 $ 17,402  
Aggregate adjustment for the period 16 (60) $ (599)
Balances at end of period 17,361 17,694 17,402
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period (955) (911) (434)
Balances at end of period (964) (955) (911)
Foreign currency translation adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period (970) (901) (421)
Aggregate adjustment for the period 14 (69) (480)
Balances at end of period (956) (970) (901)
Realized and unrealized gains (losses) on derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period 15 (11) (17)
Other comprehensive income (loss) before reclassifications, before tax (17) 19 20
Reclassification to income (1) 11 (16)
Net tax impact (1) (4) 2
Balances at end of period (4) 15 (11)
Pension and postretirement plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balances at beginning of period 0 1 4
Reclassification to income (5) (1) (3)
Net tax impact 1 0 0
Balances at end of period $ (4) $ 0 $ 1