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Restructuring (Details) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Sep. 30, 2015 | Sep. 30, 2014 USD ($) | Mar. 31, 2015 USD ($) | Mar. 31, 2014 USD ($) | Sep. 30, 2013 USD ($)
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Expected increase (decrease) in operation and maintenance expense |  |  | $ (500) |  |  |  |  |  |
Number of positions eliminated |  |  |  |  |  | 2,000 |  |  |
Severance cost liability | $ 7 | $ 46 | 7 | $ 46 |  | $ 45 | $ 1 | $ 32 | $ 0
Liabilities incurred during the period | 7 | 21 | 7 | 56 |  |  |  |  |
Actual costs paid during the period | (1) | (7) | (44) | (10) |  |  |  |  |
Adjustments to estimate during the period | $ 0 | $ 0 | $ (1) | $ 0 |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |
Number of positions eliminated |  |  |  |  | 200 |  |  |  |

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- Definition Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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