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Income Taxes (Tables)
 6 Months Ended
Jun. 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 June 30, 2022(a)
ExelonComEd
PECO(b)
BGE(b)
PHI
Pepco(b)
DPL
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)
(5.4)7.9 (0.6)2.1 1.5 (3.4)7.2 6.7 
Plant basis differences(3.3)(0.5)(11.0)(1.3)(1.7)(2.4)(0.7)(1.0)
Excess deferred tax amortization(10.5)(5.5)(3.1)(19.0)(19.2)(15.7)(20.0)(24.5)
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(0.4)(0.3)— (1.5)(0.4)(0.4)(0.4)(0.4)
Other(d)
7.7 — — 1.4 (0.1)(0.5)1.8 (1.6)
Effective income tax rate9.0 %22.5 %6.3 %2.6 %1.0 %(1.4)%8.7 %— %
Three Months Ended June 30, 2021(a)
Exelon
ComEd
PECO(e)
BGE(e)
PHI
Pepco(e)
DPL
ACE(e)
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 benefit1.1 8.0 (2.9)(12.5)2.4 (2.1)7.0 8.1 
Plant basis differences(4.0)(0.7)(12.5)(2.3)(1.1)(1.5)(0.7)(0.6)
Excess deferred tax amortization(13.4)(7.0)(3.3)(17.5)(22.3)(19.0)(21.9)(28.2)
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(1.0)(0.8)— (3.6)(0.8)(0.7)(0.9)(0.6)
Other(2.7)(1.1)(0.4)(6.6)(1.3)(1.9)(1.1)(2.3)
Effective income tax rate0.9 %19.3 %1.9 %(21.6)%(2.2)%(4.2)%3.2 %(2.8)%
__________
(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. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland and Washington, D.C. multi-year plans which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution rate case settlements.
(c)For Exelon, the lower state income taxes, net of federal income tax benefit, is primarily related to a one-time impact associated with a state tax benefit of $43 million and indemnification adjustments pursuant to the Tax Matters Agreement of $5 million as a result of the separation.
(d)For Exelon, primarily related to indemnification adjustments pursuant to the Tax Matters Agreement of $48 million.
(e)For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions. For BGE, the income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution rate case settlements.
Six Months Ended June 30, 2022(a)
ExelonComEd
PECO(b)
BGE(b)
PHI
Pepco(b)
DPL
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)
9.9 7.9 (0.3)2.3 2.8 (3.8)6.5 6.7 
Plant basis differences(3.5)(0.5)(11.2)(1.0)(1.7)(2.5)(0.7)(1.2)
Excess deferred tax amortization(11.0)(5.8)(3.2)(17.8)(18.3)(16.3)(19.5)(22.9)
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)
0.8 (0.3)— (0.6)(0.4)(0.4)(0.3)(0.3)
Other(e)
4.7 0.1 0.3 0.3 0.1 (0.7)0.4 (0.5)
Effective income tax rate21.8 %22.3 %6.6 %4.1 %3.4 %(2.7)%7.2 %2.6 %

Six Months Ended June 30, 2021(a)
Exelon
ComEd
PECO(f)
BGE(f)
PHI
Pepco(f)
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 benefit2.0 7.4 (2.1)(10.5)4.2 1.5 6.6 7.8 
Plant basis differences(3.6)(0.6)(11.3)(1.6)(1.3)(1.8)(0.7)(0.7)
Excess deferred tax amortization(12.5)(7.0)(3.3)(15.9)(20.8)(17.2)(19.7)(28.3)
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(0.5)(0.5)— (0.9)(0.5)(0.5)(0.4)(0.5)
Other(1.6)(2.3)(0.1)(1.0)(0.7)(0.8)(0.1)(1.1)
Effective income tax rate4.7 %17.9 %4.2 %(9.0)%1.8 %2.2 %6.5 %(2.0)%
__________
(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. For BGE, the lower effective tax rate is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland and Washington, D.C. multi-year plans which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due to the acceleration of certain income tax benefits due to distribution 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.
(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 $48 million.
(f)For PECO, the lower effective tax rate is primarily related to plant basis differences attributable to tax repair deductions. For BGE, the income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For Pepco, the income tax benefit is primarily due to the Maryland multi-year plan which resulted in the acceleration of certain income tax benefits. For ACE, the lower effective tax rate is primarily due 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 June 30, 2022 and December 31, 2021. ComEd's, PECO's, BGE's, Pepco's, and DPL's amounts are not material.
Exelon(a)
PHIACE
June 30, 2022$147 $58 $16 
December 31, 2021143 56 16 
__________
(a)As of June 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.