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Equity Items - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
Equity [Abstract]        
Unrealized translation gain (loss), before tax $ (12) $ 49 $ (9) $ (46)
Unrealized translation gain (loss), tax 0 0 (1) 1
Unrealized translation gain (loss), net of tax (12) 49 (10) (45)
Unrealized gain on commodity hedges, before tax 0 3 0 4
Unrealized gain on commodity hedges, tax 0 (1) 0 (1)
Unrealized gain on commodity hedges, net of tax 0 2 0 3
Total other comprehensive income (loss), before tax (12) 52 (9) (42)
Total other comprehensive income (loss), tax 0 (1) (1) 0
Other comprehensive income (loss) - Note N $ (12) $ 51 $ (10) $ (42)