Nuclear Decommissioning (Tables)

9 Months Ended

Sep. 30, 2019

Schedule Of Nuclear Decommissioning [Line Items]

Schedule of Change in Asset Retirement Obligation [Table Text Block]

The following table provides a rollforward of the nuclear decommissioning ARO reflected in Exelon’s and Generation’s Consolidated Balance Sheets from December 31, 2018 to September 30, 2019:

Nuclear decommissioning ARO at December 31, 2018 (a)(b)	$	10,005
Sale of Oyster Creek	(755		)
Accretion expense	361
Net increase due to changes in, and timing of, estimated future cash flows	211
Costs incurred related to decommissioning plants	(52		)
Nuclear decommissioning ARO at September 30, 2019 (a)	$	9,770

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(a) Includes $127 million and $22 million as the current portion of the ARO at September 30, 2019 and December 31, 2018, respectively, which is included in Other current liabilities in Exelon’s and Generation’s Consolidated Balance Sheets.

(b)

Includes $772 million of ARO related to Oyster Creek which was classified as Liabilities held for sale in Exelon's and Generation's Consolidated Balance Sheets at December 31, 2018. See Note 3 — Mergers, Acquisitions and Dispositions for additional information.