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Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation, tax $ (13) $ (13) $ 6 $ (7)
Amortization of deferred actuarial losses, tax (8) (8) (16) (17)
Deferred cash flow hedging gains (losses), tax (2) 23 (13) 17
Reclassification of realized cash flow hedging (losses), tax $ 3 $ 1 $ 4 $ 1