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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

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