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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

X

- Definition

Cash Flow Assistance Program, Estimated Allowance For Uncollectible Receivables

+ References

No definition available.

+ Details

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X

- Definition

Cash Flow Assistance Program, Potential Maximum Obligation

+ References

No definition available.

+ Details

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- Definition

Cash Flow Assistance Program, Receivables

+ References

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- Definition

Guarantee Obligations, Recourse Provisions, Value

+ References

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- Definition

Guarantor Obligations, Maximum Exposure, Period

+ References

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- Definition

Guarantor Obligations, Maximum Exposure, Remaining Lease Period

+ References

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- Definition

The face amount of financial assets, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition.

+ References

No definition available.

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X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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