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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Successor
 
Exelon(a)

Generation(b)

ComEd

PECO

BGE
 
Pepco
 
DPL
 
ACE
 
PHI
U.S. Federal statutory rate
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
Increase (decrease) due to:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
State income taxes, net of Federal income tax benefit
(2,745.7)
 
5.6
 
5.8
 
(0.6)
 
5.0
 
3.2
 
4.6
 
5.6
 
4.3
Qualified nuclear decommissioning trust fund income
3,156.6
 
(6.3)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Amortization of investment tax credit, including deferred taxes on basis difference
(528.7)
 
0.9
 
(0.2)
 
(0.1)
 
(0.2)
 
(0.1)
 
(0.1)
 
(0.4)
 
(0.1)
Plant basis differences
(2,764.4)
 
—
 
(0.2)
 
(16.0)
 
(0.3)
 
(6.2)
 
(1.7)
 
(3.3)
 
(4.8)
Production tax credits and other credits
(1,035.7)
 
2.0
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Noncontrolling interests
84.7
 
(0.2)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Like-kind exchange(c)
(5,362.4)
 
—
 
5.9
 
—
 
—
 
—
 
—
 
—
 
—
Other
1,960.6
 
1.1
 
0.5
 
0.2
 
1.3
 
(0.2)
 
0.9
 
(3.6)
 
0.9
Effective income tax rate
(7,200.0)%
 
38.1%
 
46.8%
 
18.5%
 
40.8%
 
31.7%
 
38.7%
 
33.3%
 
35.3%
 
 
 
Three Months Ended June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Successor
 
Exelon
 
Generation(d)
 
ComEd
 
PECO
 
BGE(e)
 
Pepco
 
DPL
 
ACE
 
PHI
U.S. Federal statutory rate
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
Increase (decrease) due to:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
State income taxes, net of Federal income tax benefit
2.3
 
(116.7)
 
4.8
 
0.3
 
2.0
 
3.5
 
4.8
 
5.9
 
6.1
Qualified nuclear decommissioning trust fund income
5.7
 
591.2
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Amortization of investment tax credit, including deferred taxes on basis difference
(1.8)
 
(157.8)
 
(0.2)
 
(0.1)
 
(0.4)
 
(0.1)
 
(0.6)
 
(1.6)
 
(0.3)
Plant basis differences(f)
(6.9)
 
—
 
(0.4)
 
(11.3)
 
(20.6)
 
(5.7)
 
(3.5)
 
(7.1)
 
(7.0)
Production tax credits and other credits
(5.8)
 
(603.0)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Noncontrolling interest
0.9
 
94.4
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Statute of limitations expiration

(1.7)
 
(410.8)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Merger expenses

0.2
 
—
 
—
 
—
 
—
 
0.2
 
3.1
 
—
 
1.0
Other(g)
(3.3)
 
(52.3)
 
(0.6)
 
(5.2)
 
(1.0)
 
(1.0)
 
1.2
 
7.8
 
1.0
Effective income tax rate
24.6%
 
(620.0)%
 
38.6%
 
18.7%
 
15.0%
 
31.9%
 
40.0%
 
40.0%
 
35.8%
 
Six Months Ended June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Successor
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
Pepco
 
DPL
 
ACE
 
PHI
U.S. Federal statutory rate
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
Increase (decrease) due to:
 
 
 
 
 
 
 
 
 
 

 

 

 
 
State income taxes, net of Federal income tax benefit
(1.0)
 
(13.6)
 
5.3
 
(0.1)
 
5.1
 
3.8
 
5.1
 
5.6
 
4.6
Qualified nuclear decommissioning trust fund income
5.6
 
51.2
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Amortization of investment tax credit, including deferred taxes on basis difference
(0.7)
 
(5.4)
 
(0.2)
 
(0.1)
 
(0.1)
 
(0.1)
 
(0.2)
 
(0.4)
 
(0.2)
Plant basis differences
(4.3)
 
—
 
(0.2)
 
(14.3)
 
(0.7)
 
(6.0)
 
(1.8)
 
(3.3)
 
(4.3)
Production tax credits and other credits
(1.4)
 
(12.3)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Noncontrolling interests
(0.1)
 
(0.5)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Merger expenses(h)
(11.4)
 
(13.7)
 
—
 
—
 
—
 
(16.2)
 
(15.1)
 
(85.3)
 
(23.8)
Fitzpatrick bargain purchase gain
(6.5)
 
(60.0)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Like-kind exchange(c)
(3.7)
 
—
 
2.9
 
—
 
—
 
—
 
—
 
—
 
—
Other
0.3
 
(4.2)
 
0.4
 
(0.1)
 
0.3
 
(0.7)
 
1.0
 
(1.6)
 
—
Effective income tax rate
11.8%
 
(23.5)%
 
43.2%
 
20.4%
 
39.6%
 
15.8%
 
24.0%
 
(50.0)%
 
11.3%

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Successor
 
Predecessor
 
Six Months Ended June 30, 2016
 
March 24, 2016 to June 30, 2016
 
January 1, 2016 to March 23, 2016
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
Pepco(i)
 
DPL(i)
 
ACE(i)
 
PHI(i)
 
PHI
U.S. Federal statutory rate
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
 
35.0%
Increase (decrease) due to:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
State income taxes, net of Federal income tax benefit(i)
0.8
 
2.6
 
4.9
 
0.7
 
4.6
 
(9.5)
 
(5.2)
 
5.9
 
5.2
 
11.9
Qualified nuclear decommissioning trust fund income
5.6
 
9.8
 
—
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Amortization of investment tax credit, including deferred taxes on basis difference
(1.7)
 
(2.5)
 
(0.2)
 
(0.1)
 
(0.1)
 
0.1
 
0.4
 
0.1
 
0.1
 
(0.9)
Plant basis differences(f)
(6.3)
 
—
 
(0.3)
 
(10.2)
 
(4.5)
 
12.6
 
2.0
 
1.0
 
1.7
 
(13.5)
Production tax credits and other credits
(5.5)
 
(9.6)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Noncontrolling interest
0.7
 
1.2
 
—
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Statute of limitations expiration
(1.0)
 
(3.9)
 
—
 
—
 
—
 
—
 
—
 
—
 
—
 
—
Merger expenses
14.5
 
—
 
—
 
—
 
—
 
(36.1)
 
(30.5)
 
(17.7)
 
(18.9)
 
11.1
Other(g)
(2.8)
 
(3.8)
 
(0.1)
 
(2.4)
 
0.1
 
(0.5)
 
(0.1)
 
(0.1)
 
—
 
3.6
Effective income tax rate
39.3%
 
28.8%
 
39.3%
 
23.0%
 
35.1%
 
1.6%
 
1.6%

24.2%

23.1%
 
47.2%

    
(a)
The effective tax rate for the three months ended June 30, 2017 is disproportionately impacted due to the decline in consolidated pre-tax GAAP earnings as compared to the federal and state tax impacts of the Like-kind exchange, tax credits, Plant basis differences, and Qualified nuclear decommissioning trust fund income.
(b)
Generation recognized a loss before income taxes for the three months ended June 30, 2017. As a result, positive percentages represent an income tax benefit for the period presented.
(c)
See Like-Kind Exchange within the Other Income Tax Matters section below for further details.
(d)
The effective tax rate for the three months ended June 30, 2016, is disproportionately impacted due to the decline in pre-tax GAAP earnings as compared to the changes in tax credits and other reconciling items. In three months ended June 30, 2016, due to the expiration of a statute of limitations, Generation recorded an income tax benefit of $16 million. The statute of limitations expired in the third quarter of 2015; therefore, this represents an out of period adjustment.
(e)
The effective tax rate for the three months ended June 30, 2016 is disproportionately impacted due to the decline in pre-tax GAAP earnings and changes in other reconciling items.
(f)
At BGE, includes a cumulative adjustment related to a regulatory asset.
(g)
At PECO, includes a cumulative adjustment related to an anticipated gas repairs tax return accounting method change.
(h)
Includes a remeasurement of uncertain federal and state income tax positions, see below.
(i)
Pepco, DPL and ACE recognized a loss before income taxes for the six months ended June 30, 2016, and PHI recognized a loss before income taxes for the period of March 24, 2016, through June 30, 2016. As a result, positive percentages represent an income tax benefit for the periods presented.
(j)
Includes a remeasurement of uncertain state income tax positions for Pepco and DPL.

 [1]
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
The Registrants have the following unrecognized tax benefits as of June 30, 2017 and December 31, 2016:
 
 
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
June 30, 2017
$
730

 
$
467

 
$
2

 
$
—

 
$
120

 
$
112

 
$
59

 
$
21

 
$
—

 
 
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
December 31, 2016
$
916

 
$
490

 
$
(12
)
 
$
—

 
$
120

 
$
172

 
$
80

 
$
37

 
$
22
[1] Includes a remeasurement of uncertain federal and state income tax positions, see below.