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Benefit Plans Other Postemployment Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Other Post-Employment Benefits |  |  |
Discount rate | 1.60% | 2.05% | 2.52%
Period expense | $ 35 | $ 39 | $ 34
Postemployment benefits liability | 501 | 511 | $ 520
Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent |  |  |
Other Post-Employment Benefits |  |  |
Postemployment benefits liability, noncurrent | 460 | 465 |
Accounts payable and accrued liabilities |  |  |
Other Post-Employment Benefits |  |  |
Postemployment benefits liability, current | $ 41 | $ 46 |

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- Definition The interest rate used to adjust for the time value of money. + References No definition available. + Details
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- Definition For a classified balance sheet, the carrying amount as of the balance sheet date of the portion of the obligations recognized for the various benefits provided to former or inactive employees, their beneficiaries, and covered dependents after employment but before retirement that is payable within one year of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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