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Retirement Plans Summary of Changes in Fair Value of Assets Measured Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
U.S. Pension Plans |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year |  | $ 2,606
Fair value of plan assets at end of year | $ 2,890 |
U.S. Pension Plans | Real Estate |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 2,947 |
Fair value of plan assets at end of year |  | 2,947
Non-U.S. Pension |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 2,484 | 1,177
Fair value of plan assets at end of year | 2,152 | 2,484
Non-U.S. Pension | Hedge Funds |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 169 |
Fair value of plan assets at end of year | 112 | 169
Non-U.S. Pension | Real Estate |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 11 |
Fair value of plan assets at end of year | 24 | 11
Fair Value, Inputs, Level 3 | U.S. Pension Plans |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at end of year | 0 |
Fair Value, Inputs, Level 3 | U.S. Pension Plans | Real Estate |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year |  | 0
Fair Value, Inputs, Level 3 | Non-U.S. Pension |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Hedge Funds |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | 0 | 0
Fair Value, Inputs, Level 3 | Non-U.S. Pension | Real Estate |  |
Retirement Plans [Line Items] |  |
Fair value of plan assets at beginning of year | 0 |
Fair value of plan assets at end of year | $ 0 | $ 0

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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=64937038&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6749337 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Assets -URI http://asc.fasb.org/extlink&oid=6520858 + Details
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