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Asset Retirement Obligations (Details) - Jun. 30, 2015 - USD ($) $ in Millions | Total
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Asset Retirement Obligations |  |
Asset retirement obligations, period increase (decrease) |  | $ 687
Decommissioning study update - ARO nuclear |  | 5 years
Accretion expense |  | $ 33
Balance at September 30, 2014 | [1] | 3,169
Settlements (ash storage areas) | [1] | (33)
Additional obligations |  | 606
Accretion (recorded as regulatory asset) | [1] | 114
Balance at June 30, 2015 | [1] | 3,856
Current portion of ARO |  | 180
Nuclear |  |
Asset Retirement Obligations |  |
Balance at September 30, 2014 | [1] | 2,052
Settlements (ash storage areas) | [1] | 0
Additional obligations | [1] | 0
Accretion (recorded as regulatory asset) | [1] | 74
Balance at June 30, 2015 | [1] | 2,126
Non-nuclear |  |
Asset Retirement Obligations |  |
Balance at September 30, 2014 | [1] | 1,117
Settlements (ash storage areas) | [1] | (33)
Additional obligations |  | 606
Accretion (recorded as regulatory asset) | [1] | 40
Balance at June 30, 2015 | [1] | 1,730
EPA Ruling | Non-nuclear |  |
Asset Retirement Obligations |  |
Additional obligations |  | 539
Coal-fired obligations | Non-nuclear |  |
Asset Retirement Obligations |  |
Additional obligations |  | 60
Plant acquisition | Non-nuclear |  |
Asset Retirement Obligations |  |
Additional obligations |  | $ 7
[1] | The current portion of ARO in the amount of $180 million is included in Accounts payable and accrued liabilities at June 30, 2015.

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- Definition Reconciliation of Asset Retirement Obligations [Line Items] + References No definition available. + Details
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- Definition Amount recognized for the passage of time, typically for liabilities, that have been discounted to their net present values. Excludes accretion associated with asset retirement obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 35 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6394232&loc=d3e17558-110866 + Details
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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Asset Retirement Obligation -URI http://asc.fasb.org/extlink&oid=6505190 + Details
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations incurred during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Net Increase or Decrease in the asset retirement obligation during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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