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Early Plant Retirements (Tables)
 12 Months Ended
Dec. 31, 2021
Implications of Potential Early Plant Retirements [Abstract]  
Restructuring and Related Costs [Table Text Block]
The total impact for the years ended December 31, 2021, 2020, and 2019 in Exelon's Consolidated Statements of Operations and Comprehensive Income resulting from the initial decision and subsequent reversal of the decision to early retire Byron and Dresden, and decision to early retire TMI is summarized in the table below.
Income statement expense (pre-tax)
2021(a)
2020(a)
2019(b)
Depreciation and amortization
     Accelerated depreciation(c)
$1,805 $895 $216 
     Accelerated nuclear fuel amortization148 60 13 
Operating and maintenance
     One-time charges(94)255 — 
     Other charges(d)
9 34 (53)
     Contractual offset(e)
(451)(364)— 
Total$1,417 $880 $176 
_________
(a)Reflects expense for Byron and Dresden.
(b)Reflects expense for TMI.
(c)Includes the accelerated depreciation of plant assets including any ARC.
(d)For 2020 and 2019, reflects the net impacts associated with the remeasurement of the ARO. See Note 10 – Asset Retirement Obligations for additional information.
(e)Reflects contractual offset for ARO accretion, ARC depreciation, ARO remeasurement, and excludes any changes in earnings in the NDT funds. Decommissioning-related impacts were not offset for the Byron units starting in the second quarter of 2021 due to the inability to recognize a regulatory asset at ComEd. With the September 15, 2021 reversal of the previous decision to retire Byron, Generation resumed contractual offset for Byron as of that date. Based on the regulatory agreement with the ICC, decommissioning-related activities are offset in Exelon's Consolidated Statements of Operations and Comprehensive Income as long as the net cumulative decommissioning-related activities result in a regulatory liability at ComEd. The offset resulted in an equal adjustment to the regulatory liabilities at ComEd. See Note 10 — Asset Retirement Obligations for additional information.