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Accumulated Other Comprehensive Income (Details 2) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Foreign currency translation [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Foreign currency translation, tax $ 6 $ 0
Pension and post retirement [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Amortization of deferred actuarial losses, tax (9) (4)
Cash Flow Hedges [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Deferred cash flow hedging gains (losses), tax (6) 5
Reclassification of realized cash flow hedging (losses), tax $ 0 $ 0