Early Nuclear Plant Retirements Early Nuclear Plant Retirements (Tables)

3 Months Ended

Mar. 31, 2017

Property, Plant and Equipment [Abstract]

ImplicationsofPotentialEarlyPlantRetirement [Table Text Block]

(in millions)	TMI
Asset Balances
Materials and supplies inventory	$	40
Nuclear fuel inventory, net	72
Completed plant, net	1,000
Construction work in progress	40
Liability Balances
Asset retirement obligation	(572		)
NRC License Renewal Term	2034

Schedule of Other Operating Cost and Expense, by Component [Table Text Block]

Exelon's and Generation's 2016 results included a net incremental $714 million of total pre-tax expense associated with the initial early retirement decision for Clinton and Quad Cities, as summarized in the table below.

Income statement expense (pre-tax)	Q2 2016			Q3 2016			Q4 2016			YTD 2016
Depreciation and amortization
Accelerated depreciation(a)	$	115		$	344		$	253		$	712
Accelerated Nuclear Fuel amortization	9			28			23			60
Operating and maintenance
One time charges(b)	141			5			(120		)	26
ARO accretion, net of contractual offset(c)	—			2			—			2
Contractual offset for ARC depreciation(c)	(14		)	(41		)	(31		)	(86		)
Total	$	251		$	338		$	125		$	714

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(a) Reflected incremental accelerated depreciation of plant assets, including any ARC, for the period June 2, 2016, through December 6, 2016.

(b) Primarily included materials and supplies inventory reserve adjustments, employee related costs and construction work-in-progress (CWIP) impairments.

(c) For Quad Cities based on the regulatory agreement with the Illinois Commerce Commission, decommissioning-related activities are offset within Exelon's and Generation's Consolidated Statements of Operations and Comprehensive Income. The offset results in an equal adjustment to the noncurrent payables to ComEd at Generation and an adjustment to the regulatory liabilities at ComEd. Likewise, ComEd has recorded an equal noncurrent affiliate receivable from Generation and corresponding regulatory liability.