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Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2020
Mar. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation, tax $ (13) $ (1) $ (7) $ (1)
Amortization of deferred actuarial losses, tax (8) (4) (17) (8)
Deferred cash flow hedging gains (losses), tax 23 (8) 17 (3)
Reclassification of realized cash flow hedging (losses), tax $ 1 $ 0 $ 1 $ 0