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Asset Retirement Obligations (Tables)
3 Months Ended
Mar. 31, 2016
Asset Retirement Obligation Disclosure [Abstract]  
Schedule of Change in Asset Retirement Obligation
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