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Accumulated Other Comprehensive Income (Details 2) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Foreign currency translation [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Foreign currency translation, tax $ (1) $ 0 $ (1) $ 0
Pension and post retirement [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amortization of deferred actuarial losses, tax (4) (8) (8) (16)
Cash Flow Hedges [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Deferred cash flow hedging gains (losses), tax (8) 0 (3) 0
Reclassification of deferred cash flow hedging (losses), tax $ 0 $ 2 $ 0 $ 3