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Accumulated Other Comprehensive Income (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Foreign currency translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation, tax $ (2) $ 0 $ (3) $ 0
Pension and post retirement [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amortization of deferred actuarial losses, tax (4) (8) (12) (24)
Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Deferred cash flow hedging gains (losses), tax 2 5 (1) 5
Reclassification of deferred cash flow hedging (losses), tax $ 0 $ 0 $ 0 $ 3