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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, 2022
Mar. 31, 2021
Mar. 31, 2022
Mar. 31, 2021
Equity [Abstract]        
Unrealized translation gain (loss), before tax $ (5) $ (33) $ (22) $ 15
Unrealized translation gain (loss), tax 0 (1) 1 (1)
Unrealized translation gain (loss), net of tax (5) (34) (21) 14
Unrealized gain (loss) on commodity hedges, before tax 6 0 1 0
Unrealized gain (loss) on commodity hedges, tax (1) 0 0 0
Unrealized gain (loss) on commodity hedges, net of tax 5 0 1 0
Total other comprehensive income (loss), before tax 1 (33) (21) 15
Total other comprehensive income (loss), tax (1) (1) 1 (1)
Other comprehensive income (loss), net of tax $ 0 $ (34) $ (20) $ 14