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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, 2025
Mar. 31, 2024
Mar. 31, 2025
Mar. 31, 2024
Equity [Abstract]        
Unrealized translation gain (loss), before tax $ 49 $ (27) $ (46) $ 27
Unrealized translation gain (loss), tax 0 0 1 0
Unrealized translation gain (loss), net of tax 49 (27) (45) 27
Unrealized gain (loss) on commodity hedges, before tax 3 1 4 0
Unrealized gain (loss) on commodity hedges, tax (1) 0 (1) 0
Unrealized gain (loss) on commodity hedges, net of tax 2 1 3 0
Total other comprehensive income (loss), before tax 52 (26) (42) 27
Total other comprehensive income (loss), tax (1) 0 0 0
Other comprehensive income (loss) - Note N $ 51 $ (26) $ (42) $ 27