Nuclear Decommissioning (Tables) - Exelon Generation Co L L C [Member]

3 Months Ended

Mar. 31, 2017

Schedule Of Nuclear Decommissioning [Line Items]

Nuclear decommissioning asset retirement obligation rollforward

The following table provides a rollforward of the nuclear decommissioning ARO reflected on Exelon’s and Generation’s Consolidated Balance Sheets from December 31, 2016 to March 31, 2017: 

Nuclear decommissioning ARO at December 31, 2016(a)	$	8,734
Acquisition of FitzPatrick	417
Accretion expense	109
Costs incurred to decommission retired plants	(1		)
Nuclear decommissioning ARO at March 31, 2017(a)(b)	$	9,259

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(a) Includes $11 million and $10 million for the current portion of the ARO at March 31, 2017 and December 31, 2016, respectively, which is included in Other current liabilities on Exelon’s and Generation’s Consolidated Balance Sheets.

(b) Includes the fair value of the FitzPatrick ARO liability as of March 31, 2017, the date of the acquisition. See Note 4 - Mergers, Acquisitions and Dispositions.

Unrealized Gains (Losses) on nuclear decommissioning trust funds

The following table provides unrealized gains on NDT funds for the three months ended March 31, 2017 and 2016:

	Exelon and Generation
	Three Months Ended   March 31,
	2017		2016
Net unrealized gains on decommissioning trust funds — Regulatory Agreement Units(a)	$	222	$	79
Net unrealized gains on decommissioning trust funds — Non-Regulatory Agreement Units(b)(c)	166		52

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(a) Net unrealized gains related to Generation’s NDT funds associated with Regulatory Agreement Units are included in Regulatory liabilities on Exelon’s Consolidated Balance Sheets and Noncurrent payables to affiliates on Generation’s Consolidated Balance Sheets.

(b) Excludes $(1) million and $2 million of net unrealized gains (losses) related to the Zion Station pledged assets for the three months ended March 31, 2017 and 2016 respectively. Net unrealized gains related to Zion Station pledged assets are included in the Payable for Zion Station decommissioning on Exelon’s and Generation’s Consolidated Balance Sheets.

(c) Net unrealized gains related to Generation’s NDT funds with Non-Regulatory Agreement Units are included within Other, net in Exelon’s and Generation’s Consolidated Statements of Operations and Comprehensive Income.

Zion Station pledged assets

and December 31, 2016:

	Exelon and Generation
	March 31, 2017		December 31, 2016
Carrying value of Zion Station pledged assets	$	95	$	113
Payable to Zion Solutions(a)	88		104
Current portion of payable to Zion Solutions(b)	85		90
Cumulative withdrawals by Zion Solutions to pay decommissioning costs(c)	895		878

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(a) Excludes a liability recorded within Exelon’s and Generation’s Consolidated Balance Sheets related to the tax obligation on the unrealized activity associated with the Zion Station NDT funds. The NDT funds will be utilized to satisfy the tax obligations as gains and losses are realized.

(b) Included in Other current liabilities within Exelon’s and Generation’s Consolidated Balance Sheets.

(c) Includes project expenses to decommission Zion Station and estimated tax payments on Zion Station NDT fund earnings.