v3.26.1
Equity and Noncontrolling Interests - Schedule of AOCI (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]        
Stockholders' equity, beginning balance $ 2,017 $ 1,949 $ 2,063 $ 2,443
Aggregate adjustment for the period, net of tax 14 151 (25) 18
Stockholders' equity, ending balance 2,013 2,074 2,013 2,074
Accumulated Other Comprehensive Income (Loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Stockholders' equity, beginning balance (712) (814) (670) (693)
Stockholders' equity, ending balance (699) (674) (699) (674)
Foreign currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Stockholders' equity, beginning balance (713) (803) (687) (673)
Aggregate adjustment for the period, net of tax 2 118 (24) (12)
Stockholders' equity, ending balance (711) (685) (711) (685)
Foreign currency translation adjustments | Net Investment Hedging        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Stockholders' equity, ending balance 1 (2) 1 (2)
Realized and unrealized gains (losses) on derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Stockholders' equity, beginning balance 2 (10) 18 (19)
Current period changes in fair value, net of tax 24 23 31 20
Reclassification to income, net of tax (13) (1) (36) 11
Stockholders' equity, ending balance 13 12 13 12
Pension and postretirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Stockholders' equity, beginning balance (1) (1) (1) (1)
Stockholders' equity, ending balance $ (1) $ (1) $ (1) $ (1)