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Basis of Presentation and Summary of Significant Accounting Policies - VIE (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Sep. 30, 2018
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Total assets | $ 308 | $ 313
Total liabilities | 257 | 252
Current assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 266 | 270
Noncurrent assets |  |
Variable Interest Entity [Line Items] |  |
Total assets | 42 | 43
Current liabilities |  |
Variable Interest Entity [Line Items] |  |
Total liabilities | $ 257 | $ 252

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