Early Plant Retirements (Tables)

12 Months Ended

Dec. 31, 2019

Implications of Potential Early Plant Retirements [Abstract]

Restructuring and Related Costs [Table Text Block]

As a result of these early nuclear plant retirement decisions, Exelon and Generation recognized incremental non-cash charges to earnings stemming from shortening the expected economic useful lives primarily related to accelerated depreciation of plant assets (including any ARC) and accelerated amortization of nuclear fuel, as well as operating and maintenance expenses. The total annual impact of these charges by year are summarized in the table below.

Income statement expense (pre-tax)	2019(a)			2018(b)		2017(c)
Depreciation and Amortization
Accelerated depreciation	$	216		$	539	$	250
Accelerated nuclear fuel amortization	13			57		12
Operating and Maintenance(d)	(53		)	32		77
Total	$	176		$	628	$	339

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(a) Reflects incremental charges for TMI from January 1, 2019 through September 20, 2019.

(b) Reflects incremental charges for TMI in 2018 and Oyster Creek from February 2, 2018 through September 17, 2018.

(c) Reflects incremental charges for TMI from May 30, 2017 through December 31, 2017.

(d)

In 2019, primarily reflects the net impacts associated with the remeasurements of the TMI ARO in the first and third quarters. In 2018 and 2017, primarily reflects materials and supplies inventory reserve adjustments, employee related costs and CWIP impairments associated with the early retirement decisions for TMI and Oyster Creek. Excludes the charges in the third quarter of 2018 and second quarter of 2019 for the ARO remeasurement due to the sale of Oyster Creek. See Note 2 — Mergers, Acquisitions and Dispositions and Note 9 — Asset Retirement Obligations for additional information.

Implications of Potential Early Plant Retirement on Balance Sheet [Table Text Block]

The following table provides the balance sheet amounts as of December 31, 2019 for Exelon's and Generation’s significant assets and liabilities associated with the Mystic Units 8 and 9 and Everett Marine Terminal assets that would potentially be impacted by the failure to adopt long-term solutions for reliability and fuel security.

	December 31, 2019
Asset Balances
Materials and supplies inventory	$	31
Fuel inventory	11
Property, plant and equipment, net	902
Liability Balances
Asset retirement obligation	(3		)