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Fair Value Measurements Investments Gains (Losses) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Investment Gains (Losses) |  |  |  |
Securities classified as trading and measured at fair value | $ 2,100 |  | $ 2,100 |
NDT unfunded commitments related to private partnerships | 92 |  | 92 |
SERP |  |  |  |
Investment Gains (Losses) |  |  |  |
Unrealized gains (losses) on investments | 0 | $ 1 | 0 | $ 2
LTDCP [Member] |  |  |  |
Investment Gains (Losses) |  |  |  |
Unrealized gains (losses) on investments | 0 | 0 | (1) | 0
NDT |  |  |  |
Investment Gains (Losses) |  |  |  |
Unrealized gains (losses) on investments | (19) | 36 | 15 | 72
ART |  |  |  |
Investment Gains (Losses) |  |  |  |
Unrealized gains (losses) on investments | (3) | $ 9 | 12 | $ 27
Maximum |  |  |  |
Investment Gains (Losses) |  |  |  |
Equity investments not required to be measured at fair value | $ 1 |  | $ 1 |

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- Definition Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services. + 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 210.5-02.25) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 19 -Article 7 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 17 -Article 9 + Details
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