Early Nuclear Plant Retirements Early Nuclear Plant Retirements (Tables)

9 Months Ended

Sep. 30, 2016

Property, Plant and Equipment [Abstract]

ImplicationsofPotentialEarlyPlantRetirement [Table Text Block]

(in millions)	TMI			Ginna			NMP
Asset Balances
Materials and supplies inventory	$	39		$	31		$	70
Nuclear fuel inventory, net	93			41			214
Completed plant, net	956			124			1,151
Construction work in progress	38			13			53
Liability Balances
Asset retirement obligation	(492		)	(667		)	(780		)
NRC License Renewal Term	2034			2029			2029 (unit 1)
							2046 (unit 2)

Incremental Expense Plant Retirement [Table Text Block]

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

Through September 30, 2016, Exelon's and Generation's results include an incremental $443 million of pre-tax expense for these items as summarized in the table below. Please refer to Note 12 — Nuclear Decommissioning for additional detail on changes to the Nuclear decommissioning ARO balances resulting from the early retirement of Clinton and Quad Cities.

Income statement expense (pre-tax)	September 30, 2016
Depreciation and Amortization
Accelerated depreciation(a)	$	459
Accelerated nuclear fuel amortization	37
Operating and Maintenance
Increase ARO accretion, net of contractual offset(b)	2
Contractual offset for ARC depreciation(b)	(55		)
Total	$	443

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(a) Reflects incremental accelerated depreciation of plant assets, including any ARC.

(b) 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.