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Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation, tax $ (1) $ 17 $ 5 $ 10
Amortization of deferred actuarial losses, tax (8) (9) (24) (26)
Deferred cash flow hedging gains (losses), tax (2) (11) (15) 6
Reclassification of realized cash flow hedging (losses), tax $ 3 $ (2) $ 7 $ (1)