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Asset Retirement Obligations | 3 Months Ended
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Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The changes in the carrying amounts of Talen Energy's AROs were as follows.
Balance at December 31, 2015 | $ | 501 |
Accretion expense | 9 |
Changes in estimate of cash flow or settlement date | 1 |
Obligations settled | (1 | )
Balance at March 31, 2016 | $ | 510 |
Substantially all of the ARO balances are classified as noncurrent at March 31, 2016 and December 31, 2015. Talen Energy's most significant ARO recorded relates to the decommissioning of the Susquehanna nuclear plant. See Notes 12 and 15 for additional information on the assets in the NDT funds that are legally restricted for the purposes of settling this ARO.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service 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 -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 -Topic 410 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7569-110849 + Details
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