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Supplemental Financial Information (Tables)
 6 Months Ended
Jun. 30, 2018
Supplemental Financial Information [Abstract]  
Components of non-operating income and expenses
The following tables provide additional information about the Registrants’ Consolidated Statements of Operations and Comprehensive Income for the three and six months ended June 30, 2018 and 2017.
 
Three Months Ended June 30, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other, Net
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Decommissioning-related activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net realized income on decommissioning trust funds(a)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
$
216

 
$
216

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-regulatory agreement units
143

 
143

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized losses on decommissioning trust funds
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
(194
)
 
(194
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Non-regulatory agreement units
(120
)
 
(120
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized gains on pledged assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Zion Station decommissioning
4

 
4

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Regulatory offset to decommissioning trust fund-related activities(b)
(23
)
 
(23
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total decommissioning-related activities
26

 
26

 
—

 
—

 
—


—

 
—

 
—

 
—

Investment income
6

 
5

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Interest income related to uncertain income tax positions
2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

AFUDC — Equity
13

 
—

 
2

 
—

 
4

 
7

 
6

 
1

 
—

Non-service net periodic benefit cost
(11
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
8

 
(2
)
 
2

 
—

 
—

 
4

 
2

 
2

 
1

Other, net
$
44


$
29


$
4


$
—


$
4


$
11


$
8


$
3


$
1

 
Six Months Ended June 30, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other, Net
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Decommissioning-related activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net realized income on decommissioning trust funds(a)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
$
262

 
$
262

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-regulatory agreement units
199

 
199

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized losses on decommissioning trust funds
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
(268
)
 
(268
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Non-regulatory agreement units
(215
)
 
(215
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized gains on pledged assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Zion Station decommissioning
2

 
2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Regulatory offset to decommissioning trust fund-related activities(b)
(1
)
 
(1
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total decommissioning-related activities
(21
)
 
(21
)
 
—

 
—

 
—

 
—


—

 
—

 
—

Investment income
10

 
7

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Interest income related to uncertain income tax positions
4

 
1

 
—

 
—

 
—

 
—

 
—

 
—

 
—

AFUDC — Equity
31

 
—

 
8

 
2

 
8

 
13

 
12

 
1

 
—

Non-service net periodic benefit cost
(21
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
14

 
(2
)
 
4

 
—

 
1

 
9

 
4

 
4

 
1

Other, net
$
17


$
(15
)

$
12


$
2


$
9

 
$
22


$
16


$
5


$
1

 
Three Months Ended June 30, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other, Net
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Decommissioning-related activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net realized income on decommissioning trust funds(a)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
$
211

 
$
211

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-regulatory agreement units
74

 
74

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized (losses) gains on decommissioning trust funds
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
(13
)
 
(13
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Non-regulatory agreement units
70

 
70

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized losses on pledged assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Zion Station decommissioning
(2
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Regulatory offset to decommissioning trust fund-related activities(b)
(160
)
 
(160
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total decommissioning-related activities
180

 
180

 
—

 
—

 
—


—


—

 
—

 
—

Investment income
2

 
1

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Interest expense related to uncertain income tax positions
(1
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Penalty income related to uncertain income tax positions
1

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

AFUDC — Equity
17

 
—

 
2

 
2

 
4

 
9

 
5

 
2

 
2

Non-service net periodic benefit cost
(28
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
6

 
—

 
2

 
—

 
—

 
4

 
2

 
1

 
—

Other, net
$
177


$
181


$
4


$
2


$
4

 
$
13


$
7


$
3


$
2

 
Six Months Ended June 30, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other, Net
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Decommissioning-related activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net realized income on decommissioning trust funds(a)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
$
280

 
$
280

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-regulatory agreement units
106

 
106

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized gains on decommissioning trust funds
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
210

 
210

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Non-regulatory agreement units
235

 
235

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized losses on pledged assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Zion Station decommissioning
(2
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Regulatory offset to decommissioning trust fund-related activities(b)
(396
)
 
(396
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total decommissioning-related activities
433

 
433

 
—

 
—

 
—

 
—


—

 
—

 
—

Investment income (expense)
4

 
3

 
—

 
(1
)
 
—

 
1

 
1

 
—

 
—

Penalty income related to uncertain income tax positions
2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

AFUDC — Equity
33

 
—

 
4

 
4

 
8

 
17

 
11

 
3

 
3

Non-service net periodic benefit cost
(54
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
16

 
4

 
4

 
—

 
—

 
8

 
3

 
3

 
1

Other, net
$
434


$
440


$
8


$
3


$
8

 
$
26


$
15

 
$
6

 
$
4

_________
(a)
Includes investment income and realized gains and losses on sales of investments of the trust funds.
(b)
Includes the elimination of NDT fund activity for the Regulatory Agreement Units, including the elimination of net income taxes related to all NDT fund activity for those units. See Note 15 — Asset Retirement Obligations of the Exelon 2017 Form 10-K for additional information regarding the accounting for nuclear decommissioning.
Schedule Of Taxes Excluding Income And Excise Taxes [Text Block]
The following utility taxes are included in revenues and expenses for the three and six months ended June 30, 2018 and 2017. Generation’s utility tax expense represents gross receipts tax related to its retail operations, and the Utility Registrants' utility tax expense represents municipal and state utility taxes and gross receipts taxes related to their operating revenues. The offsetting collection of utility taxes from customers is recorded in revenues on the Registrants’ Consolidated Statements of Operations and Comprehensive Income.
 
Three Months Ended June 30, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Utility taxes
$
218


$
29


$
60


$
30


$
21

 
$
78

 
$
73


$
5


$
—


 
Six Months Ended June 30, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Utility taxes
$
452


$
60


$
121


$
63


$
47

 
$
161

 
$
151


$
10


$
—

 
Three Months Ended June 30, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Utility taxes
$
213


$
30


$
57


$
29


$
21

 
$
76

 
$
72


$
4


$
—

 
Six Months Ended June 30, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Utility taxes
$
438


$
63


$
116


$
60


$
47

 
$
152

 
$
143


$
9


$
—
Components of depreciation, amortization and accretion, and other, net
The following tables provide additional information regarding the Registrants’ Consolidated Statements of Cash Flows for the six months ended June 30, 2018 and 2017.
 
Six Months Ended June 30, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Depreciation, amortization and accretion
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Property, plant and equipment(a)
$
1,873

 
$
890

 
$
406

 
$
135

 
$
164

 
$
236

 
$
107

 
$
64

 
$
47

Amortization of regulatory assets(a)
278

 
—

 
53

 
14

 
84

 
127

 
81

 
24

 
22

Amortization of intangible assets, net(a)
28

 
24

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of energy contract assets and liabilities(b)
10

 
10

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel(c)
569

 
569

 
—

 
—

 
—

 
—

 
—

 
—

 
—

ARO accretion(d)
242

 
242

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total depreciation, amortization and accretion
$
3,000


$
1,735


$
459


$
149


$
248

 
$
363

 
$
188


$
88


$
69

 
Six Months Ended June 30, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Depreciation, amortization and accretion
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Property, plant and equipment(a)
$
1,545

 
$
612

 
$
384

 
$
129

 
$
155

 
$
227

 
$
101

 
$
61

 
$
44

Amortization of regulatory assets(a)
238

 
—

 
35

 
12

 
84

 
105

 
59

 
18

 
28

Amortization of intangible assets, net(a)
28

 
25

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of energy contract assets and liabilities(b)
20

 
20

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel(c)
529

 
529

 
—

 
—

 
—

 
—

 
—

 
—

 
—

ARO accretion(d)
231

 
229

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total depreciation, amortization and accretion
$
2,591


$
1,415


$
419


$
141


$
239

 
$
332

 
$
160


$
79


$
72

_________
(a)
Included in Depreciation and amortization on the Registrants' Consolidated Statements of Operations and Comprehensive Income.
(b)
Included in Operating revenues or Purchased power and fuel expense on the Registrants’ Consolidated Statements of Operations and Comprehensive Income.
(c)
Included in Purchased power and fuel expense on the Registrants’ Consolidated Statements of Operations and Comprehensive Income.
(d)
Included in Operating and maintenance expense on the Registrants’ Consolidated Statements of Operations and Comprehensive Income
Cash Flow Supplemental Disclosures
 
Six Months Ended June 30, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other non-cash operating activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and non-pension postretirement benefit costs
$
290

 
$
100

 
$
88

 
$
10

 
$
29

 
$
34

 
$
8

 
$
3

 
$
6

Loss from equity method investments
12

 
12

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Provision for uncollectible accounts
77

 
28

 
18

 
11

 
5

 
15

 
7

 
2

 
5

Stock-based compensation costs
47

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other decommissioning-related activity(a)
(61
)
 
(61
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Energy-related options(b)
(7
)
 
(7
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of regulatory asset related to debt costs
4

 
—

 
2

 
—

 
—

 
2

 
1

 
1

 
—

Amortization of rate stabilization deferral
13

 
—

 
—

 
—

 
—

 
13

 
10

 
3

 
—

Amortization of debt fair value adjustment
(7
)
 
(6
)
 
—

 
—

 
—

 
(1
)
 
—

 
—

 
—

Discrete impacts from EIMA and FEJA(c)
14

 
—

 
14

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of debt costs
18

 
7

 
2

 
1

 
1

 
3

 
1

 
—

 
—

Provision for excess and obsolete inventory
13

 
12

 
1

 
—

 
—

 
—

 
—

 
—

 
—

Long-term incentive plan
51

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
15

 
—

 
(8
)
 
—

 
(8
)
 
5

 
(3
)
 
5

 
1

Total other non-cash operating activities
$
479


$
85


$
117


$
22


$
27

 
$
71

 
$
24


$
14


$
12

Non-cash investing and financing activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(Decrease) increase in capital expenditures not paid
$
(283
)
 
$
(310
)
 
$
(22
)
 
$
(17
)
 
$
10

 
$
61

 
$
28

 
$
17

 
$
14

Increase in PPE related to ARO update
47

 
47

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Dividends on stock compensation
3

 
—

 
—

 
—

 
—

 
—

 
—


—

 
—

Acquisition of land
3

 
—

 
—

 
—

 
—

 
3

 
—

 
—

 
3

 
Six Months Ended June 30, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other non-cash operating activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and non-pension postretirement benefit costs
$
320

 
$
113

 
$
87

 
$
14

 
$
31

 
$
48

 
$
13

 
$
6

 
$
7

Loss from equity method investments
19

 
19

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Provision for uncollectible accounts
52

 
19

 
15

 
9

 
3

 
6

 
4

 
—

 
2

Stock-based compensation costs
57

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other decommissioning-related activity(a)
(144
)
 
(144
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Energy-related options(b)
11

 
11

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of regulatory asset related to debt costs
4

 
—

 
2

 
—

 
—

 
2

 
1

 
1

 
—

Amortization of rate stabilization deferral
(8
)
 
—

 
—

 
—

 
7

 
(15
)
 
(10
)
 
(5
)
 
—

Amortization of debt fair value adjustment
(9
)
 
(6
)
 
—

 
—

 
—

 
(3
)
 
—

 
—

 
—

Discrete impacts from EIMA and FEJA (c)
(51
)
 
—

 
(51
)
 
—

 
—

 
—

 
—

 
—

 
—

Amortization of debt costs
49

 
30

 
2

 
1

 
1

 
—

 
—

 
—

 
—

Provision for excess and obsolete inventory
51

 
49

 
1

 
—

 
—

 
1

 
—

 
—

 
—

Merger-related commitments(d)
—

 
—

 
—

 
—

 
—

 
(8
)
 
(6
)
 
(2
)
 
—

Severance costs
25

 
17

 
—

 
—

 
—

 
3

 
—

 
—

 
—

Other
39

 
13

 
2

 
(2
)
 
(7
)
 
(6
)
 
(2
)
 
(3
)
 
(2
)
Total other non-cash operating activities
$
415


$
121


$
58


$
22


$
35

 
$
28

 
$
—


$
(3
)

$
7

Non-cash investing and financing activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(Decrease) increase in capital expenditures not paid
$
(105
)
 
$
48

 
$
(82
)
 
$
(44
)
 
$
6

 
$
(8
)
 
$
—

 
$
15

 
$
(14
)
Fair value of pension obligation transferred in connection with the FitzPatrick acquisition
—

 
49

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Change in PPE related to ARO update
103

 
103

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Indemnification of like-kind exchange tax position(e)
—

 
—

 
23

 
—

 
—

 
—

 
—

 
—

 
—

Non-cash financing of capital projects
13

 
13

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Dividends on stock compensation
3

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Loss on reissuance of treasury stock
1,054

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—


_________
(a)
Includes the elimination of NDT fund activity for the Regulatory Agreement Units, including the elimination of operating revenues, ARO accretion, ARC amortization, investment income and income taxes related to all NDT fund activity for these units. See Note 15 — Asset Retirement Obligations of the Exelon 2017 Form 10-K for additional information regarding the accounting for nuclear decommissioning.
(b)
Includes option premiums reclassified to realized at the settlement of the underlying contracts and recorded in Operating revenues and expenses.
(c)
Reflects the change in ComEd's distribution and energy efficiency formula rates. See Note 6 — Regulatory Matters for additional information.
(d)
See Note 4 - Mergers, Acquisitions and Dispositions for additional information.
(e)
See Note 12 - Income Taxes for discussion of the like-kind exchange tax position.
Supplemental Balance Sheet Disclosures
The following tables provide a reconciliation of cash, cash equivalents and restricted cash reported within the Registrants’ Consolidated Balance Sheets that sum to the total of the same amounts in their Consolidated Statements of Cash Flows.
June 30, 2018
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Cash and cash equivalents
$
694

 
$
420

 
$
30

 
$
18

 
$
7

 
$
195

 
$
47

 
$
141

 
$
6

Restricted cash
206

 
130

 
5

 
5

 
1

 
38

 
33

 
—

 
5

Restricted cash included in other long-term assets
128

 
—

 
108

 
—

 
—

 
20

 
—

 
—

 
20

Total cash, cash equivalents and restricted cash
$
1,028

 
$
550

 
$
143

 
$
23

 
$
8

 
$
253

 
$
80

 
$
141

 
$
31

December 31, 2017
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Cash and cash equivalents
$
898

 
$
416

 
$
76

 
$
271

 
$
17

 
$
30

 
$
5

 
$
2

 
$
2

Restricted cash
207

 
138

 
5

 
4

 
1

 
42

 
35

 
—

 
6

Restricted cash included in other long-term assets
85

 
—

 
63

 
—

 
—

 
23

 
—

 
—

 
23

Total cash, cash equivalents and restricted cash
$
1,190

 
$
554

 
$
144

 
$
275

 
$
18

 
$
95

 
$
40

 
$
2

 
$
31

June 30, 2017
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Cash and cash equivalents
$
536

 
$
265

 
$
39

 
$
45

 
$
12

 
$
151

 
$
119

 
$
6

 
$
7

Restricted cash
252

 
166

 
12

 
4

 
6

 
40

 
34

 
—

 
7

Restricted cash included in other long-term assets
23

 
—

 
—

 
—

 
—

 
23

 
—

 
—

 
23

Total cash, cash equivalents and restricted cash
$
811

 
$
431

 
$
51

 
$
49

 
$
18

 
$
214

 
$
153

 
$
6

 
$
37

December 31, 2016
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Cash and cash equivalents
$
635

 
$
290

 
$
56

 
$
63

 
$
23

 
$
170

 
$
9

 
$
46

 
$
101

Restricted cash
253

 
158

 
2

 
4

 
24

 
43

 
33

 
—

 
9

Restricted cash included in other long-term assets
26

 
—

 
—

 
—

 
3

 
23

 
—

 
—

 
23

Total cash, cash equivalents and restricted cash
$
914

 
$
448

 
$
58

 
$
67

 
$
50

 
$
236

 
$
42

 
$
46

 
$
133

For additional information on restricted cash see Note 1 — Significant Accounting Policies of the Exelon 2017 Form 10-K. 
Supplemental Balance Sheet Information
The following tables provide additional information about assets and liabilities of the Registrants as of June 30, 2018 and December 31, 2017.
June 30, 2018
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Property, plant and equipment:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Accumulated depreciation and amortization
$
22,302

(a) 
$
12,143

(a)  
$
4,491


$
3,482


$
3,530

 
$
671

 
$
3,269


$
1,295


$
1,105

Accounts receivable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts
$
339


$
123


$
82


$
57


$
21

 
$
55

 
$
23


$
14


$
18

December 31, 2017
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Property, plant and equipment:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Accumulated depreciation and amortization
$
21,064

(b) 
$
11,428

(b) 
$
4,269


$
3,411


$
3,405

 
$
487

 
$
3,177


$
1,247


$
1,066

Accounts receivable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts
$
322


$
114


$
73


$
56


$
24

 
$
55

 
$
21


$
16


$
18

_________
(a)
Includes accumulated amortization of nuclear fuel in the reactor core of $3,094 million.
(b)
Includes accumulated amortization of nuclear fuel in the reactor core of $3,159 million