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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2022
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The effective income tax rate from continuing operations varies from the U.S. federal statutory rate principally due to the following:
Three Months Ended September 30, 2022(a)
ExelonComEd
PECO(b)
BGE(b)
PHI(b)
Pepco(b)
DPL(b)
ACE(b)
U.S. Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit9.0 8.0 20.7 6.8 1.4 (2.7)6.5 7.0 
Plant basis differences(5.3)(0.4)(14.2)(2.6)(1.7)(2.3)(0.8)(1.0)
Excess deferred tax amortization(11.6)(5.6)(3.2)(47.3)(19.3)(14.6)(21.7)(25.5)
Amortization of investment tax credit, including deferred taxes on basis difference(0.1)(0.1)— (0.2)(0.1)— (0.2)(0.2)
Tax credits(0.6)(0.4)— (1.9)(0.9)(0.8)(1.3)(0.7)
Other(0.4)(0.1)0.3 (2.7)0.3 0.1 0.2 0.5 
Effective income tax rate12.0 %22.4 %24.6 %(26.9)%0.7 %0.7 %3.7 %1.1 %
Three Months Ended September 30, 2021(a)
Exelon
ComEd
PECO(c)
BGE(c)
PHI
Pepco
DPL
ACE(c)
U.S. Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit7.1 8.0 (4.1)(13.0)5.0 3.4 6.4 7.0 
Plant basis differences(4.7)(0.8)(16.2)(1.4)(1.3)(2.0)(0.6)(0.6)
Excess deferred tax amortization(15.5)(7.6)(3.4)(17.3)(24.9)(17.6)(19.9)(41.4)
Amortization of investment tax credit, including deferred taxes on basis difference(0.1)(0.1)— (0.1)(0.1)— (0.2)(0.2)
Tax credits(0.6)(0.5)— (0.9)(0.5)(0.5)(0.4)(0.5)
Other(0.1)0.3 (0.1)(0.8)— 0.1 (0.6)0.8 
Effective income tax rate7.1 %20.3 %(2.8)%(12.5)%(0.8)%4.4 %5.7 %(13.9)%
__________
(a)Positive percentages represent income tax expense. Negative percentages represent income tax benefit.
(b)For PECO, the higher effective tax rate is related to a one-time state income expense, net of federal income tax benefit, of $38 million attributable to the change in the Pennsylvania corporate income tax rate partially offset by plant basis differences attributable to tax repair deductions. For BGE, PHI, Pepco, DPL, and ACE, the lower effective tax rate is primarily related to the acceleration of certain income tax benefits due to distribution and transmission rate case settlements.
(c)For PECO, the income tax benefit is primarily due to plant basis differences attributable to tax repair deductions. For BGE and ACE, the income tax benefit is primarily related to the acceleration of certain income tax benefits due to distribution rate case settlements.
Nine Months Ended September 30, 2022(a)
ExelonComEd
PECO(b)
BGE(b)
PHI(b)
Pepco(b)
DPL(b)
ACE(b)
U.S. Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit(c)
9.5 7.9 6.6 2.8 2.0 (3.2)6.5 6.9 
Plant basis differences(4.2)(0.5)(12.2)(1.1)(1.7)(2.4)(0.7)(1.1)
Excess deferred tax amortization(11.3)(5.7)(3.2)(20.7)(18.8)(15.4)(20.4)(24.7)
Amortization of investment tax credit, including deferred taxes on basis difference(0.1)(0.1)— (0.1)(0.1)— (0.2)(0.2)
Tax credits(d)
0.3 (0.3)— (0.7)(0.7)(0.6)(0.7)(0.6)
Other(e)
2.8 — 0.2 (0.1)0.2 (0.2)0.3 0.2 
Effective income tax rate18.0 %22.3 %12.4 %1.1 %1.9 %(0.8)%5.8 %1.5 %

Nine Months Ended September 30, 2021(a)
Exelon
ComEd
PECO(f)
BGE(f)
PHI
Pepco
DPL
ACE(f)
U.S. Federal statutory rate21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %21.0 %
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit3.8 7.6 (2.6)(10.8)4.6 2.5 6.5 7.3 
Plant basis differences(4.0)(0.7)(12.6)(1.5)(1.3)(1.9)(0.7)(0.6)
Excess deferred tax amortization(13.5)(7.2)(3.3)(16.0)(22.8)(17.4)(19.7)(36.3)
Amortization of investment tax credit, including deferred taxes on basis difference(0.1)(0.1)— (0.1)(0.1)— (0.2)(0.2)
Tax credits(0.6)(0.5)— (0.9)(0.5)(0.5)(0.4)(0.5)
Other(1.1)(1.3)(0.2)(0.7)(0.3)(0.4)(0.2)— 
Effective income tax rate5.5 %18.8 %2.3 %(9.0)%0.6 %3.3 %6.3 %(9.3)%
__________
(a)Positive percentages represent income tax expense. Negative percentages represent income tax benefit.
(b)For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions partially offset by higher state income taxes, net of federal income tax benefit, related to a one-time expense of $38 million attributable to the change in the Pennsylvania corporate income tax rate. For BGE, PHI, Pepco, DPL and ACE, the lower effective tax rate is primarily related to the acceleration of certain income tax benefits due to distribution and transmission rate case settlements.
(c)For Exelon, the higher state income taxes, net of federal income tax benefit, is primarily due to the long-term marginal state income tax rate change of $67 million and the recognition of a valuation allowance of $40 million against the net deferred tax asset position for certain standalone state filing jurisdictions, partially offset by a one-time impact associated with a state tax benefit of $43 million and indemnification adjustments pursuant to the Tax Matters Agreement of $4 million as a result of the separation. For PECO, the higher state income taxes, net of federal income tax benefit, related to a one-time expense of $38 million attributable to the change in the Pennsylvania corporate income tax rate.
(d)For Exelon, reflects the income tax expense related to the write-off of federal tax credits subject to recapture of $15 million as a result of the separation.
(e)For Exelon, primarily reflects the nondeductible transaction costs of approximately $19 million arising as part of the separation and indemnification adjustments pursuant to the Tax Matters Agreement of $40 million.
(f)For PECO, the lower effective tax rate is primarily due to plant basis differences attributable to tax repair deductions. For BGE and ACE, the income tax benefit is primarily related to the acceleration of certain income tax benefits due to distribution rate case settlements.
Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]
Exelon, PHI and ACE have the following unrecognized tax benefits as of September 30, 2022 and December 31, 2021. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material.
Exelon(a)
PHIACE
September 30, 2022$148 $59 $17 
December 31, 2021143 56 16 
__________
(a)As of September 30, 2022, Exelon recorded a receivable of $50 million in Noncurrent other assets in the Consolidated Balance Sheet for Constellation’s share of unrecognized tax benefits for periods prior to the separation.
Allocation of Tax Benefits
The following table presents the allocation of tax benefits from Exelon under the Tax Sharing Agreement, for the nine months ended September 30, 2022 and 2021.
ComEdPECOBGEPHIPepcoDPLACE
September 30, 2022
$1 $47 $— $28 $23 $3 $2 
September 30, 20211 19 — 17 16 — —