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Supplemental Financial Information (Tables)
 3 Months Ended
Mar. 31, 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 months ended March 31, 2018 and 2017.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 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
$
46

 
$
46

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-regulatory agreement units
56

 
56

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized losses on decommissioning trust funds
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
(75
)
 
(75
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Non-regulatory agreement units
(96
)
 
(96
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

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

 
—

 
—

 
—

 
—

 
—

 
—

Regulatory offset to decommissioning trust fund-related activities(b)
24

 
24

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total decommissioning-related activities
(47
)
 
(47
)
 
—

 
—

 
—

 
—


—

 
—

 
—

Investment income
4

 
2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Interest income related to uncertain income tax positions
2

 
1

 
—

 
—

 
—

 
—

 
—

 
—

 
—

AFUDC — Equity
18

 
—

 
6

 
2

 
4

 
6

 
5

 
1

 
—

Non-service net periodic benefit cost
(10
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
5

 
—

 
2

 
—

 
—

 
5

 
3

 
1

 
1

Other, net
$
(28
)

$
(44
)

$
8


$
2


$
4

 
$
11


$
8


$
2


$
1

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 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
$
68

 
$
68

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Non-regulatory agreement units
32

 
32

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized gains on decommissioning trust funds
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Regulatory agreement units
222

 
222

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Non-regulatory agreement units
166

 
166

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Net unrealized losses on pledged assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Zion Station decommissioning
(1
)
 
(1
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Regulatory offset to decommissioning trust fund-related activities(b)
(234
)
 
(234
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total decommissioning-related activities
253

 
253

 
—

 
—

 
—

 
—


—

 
—

 
—

Investment income
2

 
2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Interest income related to uncertain income tax positions
1

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

AFUDC — Equity
17

 
—

 
2

 
2

 
4

 
9

 
5

 
2

 
2

Non-service net periodic benefit cost
(26
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other
10

 
4

 
2

 
—

 
—

 
4

 
3

 
1

 
—

Other, net
$
257


$
259


$
4


$
2


$
4

 
$
13


$
8

 
$
3

 
$
2

_________
(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 months ended March 31, 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 March 31, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Utility taxes
$
235


$
32


$
61


$
33


$
26

 
$
83

 
$
77


$
6


$
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Utility taxes
$
224


$
32


$
59


$
31


$
26

 
$
76

 
$
71


$
5


$
—
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 three months ended March 31, 2018 and 2017.
 
Three Months Ended March 31, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Depreciation, amortization and accretion
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Property, plant and equipment(a)
$
926

 
$
436

 
$
201

 
$
68

 
$
82

 
$
117

 
$
53

 
$
32

 
$
23

Amortization of regulatory assets(a)
152

 
—

 
27

 
7

 
52

 
66

 
43

 
13

 
10

Amortization of intangible assets, net(a)
13

 
12

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of energy contract assets and liabilities(b)
3

 
3

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel(c)
287

 
287

 
—

 
—

 
—

 
—

 
—

 
—

 
—

ARO accretion(d)
120

 
120

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total depreciation, amortization and accretion
$
1,501


$
858


$
228


$
75


$
134

 
$
183

 
$
96


$
45


$
33

 
Three Months Ended March 31, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Depreciation, amortization and accretion
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Property, plant and equipment(a)
$
754

 
$
289

 
$
190

 
$
64

 
$
80

 
$
112

 
$
50

 
$
30

 
$
21

Amortization of regulatory assets(a)
128

 
—

 
18

 
7

 
48

 
55

 
32

 
9

 
14

Amortization of intangible assets, net(a)
14

 
13

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of energy contract assets and liabilities(b)
2

 
2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Nuclear fuel(c)
264

 
264

 
—

 
—

 
—

 
—

 
—

 
—

 
—

ARO accretion(d)
112

 
110

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Total depreciation, amortization and accretion
$
1,274


$
678


$
208


$
71


$
128

 
$
167

 
$
82


$
39


$
35

_________
(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
 
Three Months Ended March 31, 2018
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other non-cash operating activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and non-pension postretirement benefit costs
$
145

 
$
51

 
$
45

 
$
5

 
$
14

 
$
15

 
$
4

 
$
—

 
$
3

Loss from equity method investments
7

 
7

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Provision for uncollectible accounts
64

 
11

 
8

 
17

 
8

 
20

 
6

 
8

 
5

Stock-based compensation costs
29

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other decommissioning-related activity(a)
(31
)
 
(31
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

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

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of regulatory asset related to debt costs
2

 
—

 
1

 
—

 
—

 
1

 
—

 
—

 
—

Amortization of rate stabilization deferral
7

 
—

 
—

 
—

 
—

 
7

 
1

 
6

 
—

Amortization of debt fair value adjustment
(3
)
 
(3
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Discrete impacts from EIMA and FEJA(c)
(4
)
 
—

 
(4
)
 
—

 
—

 
—

 
—

 
—

 
—

Amortization of debt costs
9

 
3

 
1

 
—

 
—

 
1

 
—

 
—

 
—

Provision for excess and obsolete inventory

13

 
12

 
1

 
—

 
—

 
—

 
—

 
—

 
—

Other
9

 
2

 
(6
)
 
(1
)
 
(2
)
 
9

 
(1
)
 
5

 
1

Total other non-cash operating activities
$
240


$
45


$
46


$
21


$
20

 
$
53

 
$
10


$
19


$
9

Non-cash investing and financing activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Increase (decrease) in capital expenditures not paid
$
(177
)
 
$
(131
)
 
$
(48
)
 
$
(25
)
 
$
(11
)
 
$
61

 
$
19

 
$
14

 
$
27

Increase in PPE related to ARO update
32

 
32

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Dividends on stock compensation
1

 
—

 
—

 
—

 
—

 
—

 
—


—

 
—

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Three Months Ended March 31, 2017
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Other non-cash operating activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Pension and non-pension postretirement benefit costs
$
157

 
$
54

 
$
44

 
$
7

 
$
16

 
$
24

 
$
7

 
$
3

 
$
3

Loss from equity method investments
10

 
10

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Provision for uncollectible accounts
34

 
9

 
7

 
17

 
5

 
(4
)
 
(5
)
 
(1
)
 
1

Stock-based compensation costs
31

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Other decommissioning-related activity(a)
(84
)
 
(84
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Energy-related options(b)
(4
)
 
(4
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Amortization of regulatory asset related to debt costs
2

 
—

 
1

 
—

 
—

 
1

 
—

 
—

 
—

Amortization of rate stabilization deferral
(14
)
 
—

 
—

 
—

 
7

 
(21
)
 
(15
)
 
(6
)
 
—

Amortization of debt fair value adjustment
(5
)
 
(3
)
 
—

 
—

 
—

 
(2
)
 
—

 
—

 
—

Discrete impacts from EIMA and FEJA (c)
(24
)
 
—

 
(24
)
 
—

 
—

 
—

 
—

 
—

 
—

Amortization of debt costs
9

 
4

 
1

 
—

 
—

 
—

 
—

 
—

 
—

Provision for excess and obsolete inventory
2

 
1

 
1

 
—

 
—

 
—

 
—

 
—

 
—

Other
4

 
3

 
1

 
(1
)
 
(4
)
 
(6
)
 
(2
)
 
(3
)
 
(2
)
Total other non-cash operating activities
$
118


$
(10
)

$
31


$
23


$
24

 
$
(8
)
 
$
(15
)

$
(7
)

$
2

Non-cash investing and financing activities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Increase (decrease) in capital expenditures not paid

$
(193
)
 
$
(56
)
 
$
(66
)
 
$
(42
)
 
$
1

 
$
(5
)
 
$
(6
)
 
$
9

 
$
—

Non-cash financing of capital projects
10

 
10

 
—

 
—

 
—

 
—

 
—

 
—

 
—

Dividends on stock compensation
2

 
—

 
—

 
—

 
—

 
—

 
—

 
—

 
—


_________
(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.
(c)
Reflects the change in distribution rates pursuant to EIMA and FEJA, which allows for the recovery of distribution costs by a utility through a pre-established performance-based formula rate tariff. Beginning June 1, 2017, also reflects the change in energy efficiency rates pursuant to FEJA, which allows for the recovery of energy efficiency costs by a utility through a pre-established performance-based formula rate tariff. See Note 6 — Regulatory Matters for more information.
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.
March 31, 2018
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Cash and cash equivalents
$
787

 
$
610

 
$
70

 
$
21

 
$
22

 
$
43

 
$
15

 
$
7

 
$
10

Restricted cash
209

 
127

 
9

 
5

 
2

 
40

 
33

 
—

 
7

Restricted cash included in other long-term assets
103

 
—

 
83

 
—

 
—

 
20

 
—

 
—

 
20

Total cash, cash equivalents and restricted cash shown in the statement of cash flows
$
1,099

 
$
737

 
$
162

 
$
26

 
$
24

 
$
103

 
$
48

 
$
7

 
$
37

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 shown in the statement of cash flows
$
1,190

 
$
554

 
$
144

 
$
275

 
$
18

 
$
95

 
$
40

 
$
2

 
$
31

March 31, 2017
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Cash and cash equivalents
$
609

 
$
400

 
$
31

 
$
28

 
$
11

 
$
109

 
$
8

 
$
44

 
$
54

Restricted cash
254

 
140

 
3

 
4

 
43

 
41

 
33

 
—

 
7

Restricted cash included in other long-term assets
26

 
—

 
—

 
—

 
3

 
23

 
—

 
—

 
23

Total cash, cash equivalents and restricted cash shown in the statement of cash flows
$
889

 
$
540

 
$
34

 
$
32

 
$
57

 
$
173

 
$
41

 
$
44

 
$
84

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 shown in the statement of cash flows
$
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 March 31, 2018 and December 31, 2017.
March 31, 2018
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Property, plant and equipment:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Accumulated depreciation and amortization
$
21,905

(a) 
$
11,936

(a)  
$
4,391


$
3,445


$
3,471

 
$
575

 
$
3,224


$
1,273


$
1,086

Accounts receivable:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Allowance for uncollectible accounts
$
369


$
115


$
89


$
68


$
31

 
$
66

 
$
24


$
22


$
20

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 $3,263 million.
(b)
Includes accumulated amortization of nuclear fuel in the reactor core of $3,159 million