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Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation, tax $ 19 $ 6
Amortization of deferred actuarial losses, tax (8) (9)
Deferred cash flow hedging gains (losses), tax (11) (6)
Reclassification of realized cash flow hedging (losses), tax $ 1 $ 0