v3.26.1
Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance     $ 12,954  
Aggregate adjustment for the period $ 68 $ (133) 217 $ (340)
Ending Balance 13,515 17,045 13,515 17,045
AOCI Attributable to Parent        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (494) (1,128) (642) (964)
Aggregate adjustment for the period 63 (153) 211 (317)
Ending Balance (431) (1,281) (431) (1,281)
Foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (493) (1,131) (638) (956)
Aggregate adjustment for the period 65 (147) 210 (322)
Ending Balance (428) (1,278) (428) (1,278)
Other        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning Balance (1) 3 (4) (8)
Current period changes in fair value 3 0 19 16
Reclassification to income (5) (7) (17) (11)
Net tax impact 0 1 (1) 0
Ending Balance $ (3) $ (3) $ (3) $ (3)