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Commitments (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Sep. 30, 2017
Guarantor Obligations [Line Items] |  |
Potential maximum obligation under cash flow assistance programs | $ 350 |
Total receivables under cash flow assistance programs | 2 | $ 0
Uncollectible receivables estimated under cash flow assistance programs | 0 | 0
Guarantor Obligations, Current Carrying Value | 0 | $ 0
Industrial Revenue Bonds [Member] |  |
Guarantor Obligations [Line Items] |  |
Industrial Revenue Bonds | $ 636 |
Guarantee of Indebtedness of Others [Member] |  |
Guarantor Obligations [Line Items] |  |
Guarantor Obligations, Maximum Exposure, Period (in years) | 10 years |
Maximum potential amount | $ 17 |
Residual Value Guarantees [Member] |  |
Guarantor Obligations [Line Items] |  |
Maximum potential amount | $ 103 |
Guarantor Obligations, Maximum Exposure, Remaining Lease Period (in years) | 10 years |
Amount recoverable through various recourse provisions | $ 92 |

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