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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2019
Asset Retirement Obligation Disclosure [Abstract]  
Asset Retirement Obligation Rollforward
The following table provides a rollforward of the nuclear decommissioning ARO reflected in Exelon’s and Generation’s Consolidated Balance Sheets, from January 1, 2018 to December 31, 2019:
Nuclear decommissioning ARO at January 1, 2018
$
9,662

Accretion expense
478

Net decrease due to changes in, and timing of, estimated future cash flows
(77
)
Costs incurred related to decommissioning plants
(58
)
Nuclear decommissioning ARO at December 31, 2018 (a) (b)
10,005

Net increase due to changes in, and timing of, estimated future cash flows

864

Sale of Oyster Creek
(755
)
Accretion Expense
479

Costs incurred related to decommissioning plants
(89
)
Nuclear decommissioning ARO at December 31, 2019 (a)
$
10,504

__________
(a)
Includes $112 million and $22 million as the current portion of the ARO at December 31, 2019 and 2018, respectively, which is included in Other current liabilities in Exelon’s and Generation’s Consolidated Balance Sheets.
(b)
Includes $772 million of ARO related to Oyster Creek which is classified as Liabilities held for sale in Exelon's and Generation's Consolidated Balance Sheets at December 31, 2018. See Note 2 — Mergers, Acquisitions and Dispositions for additional information.
The following table provides a rollforward of the non-nuclear AROs reflected in the Registrants’ Consolidated Balance Sheets from January 1, 2018 to December 31, 2019:
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI
 
Pepco
 
DPL
 
ACE
Non-nuclear AROs at January 1, 2018
$
384

 
$
197


$
113


$
27


$
24

 
$
16

 
$
3

 
$
10

 
$
3

Net increase due to changes in, and timing of, estimated future cash flows(a)
80

 
35


7


—


2

 
36

 
34

 
1

 
1

Accretion expense(b)
16

 
10

 
4

 
1

 
1

 
—

 
—

 
—

 
—

Asset divestitures
(3
)
 
(3
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Payments
(6
)
 
(1
)

(3
)

—


(2
)
 
—

 
—

 
—

 
—

Non-nuclear AROs at December 31, 2018
471

 
238


121


28


25

 
52

 
37


11


4

Net (decrease) increase due to changes in, and timing of, estimated future cash flows
17

 
7


8


—


(2
)
 
4

 
3

 
1

 
—

Development projects
2

 
2


—


—


—

 
—

 
—

 
—

 
—

Accretion expense(b)
16

 
12


1


1


1

 
1

 
1

 
—

 
—

Asset divestitures
(42
)
 
(42
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Payments
(4
)
 
(1
)

(1
)

(1
)

(1
)
 
—

 
—

 
—

 
—

Non-nuclear AROs at December 31, 2019
$
460

 
$
216


$
129


$
28


$
23

 
$
57

 
$
41


$
12


$
4

__________
(a)
In 2018, Pepco recorded an increase of $22 million in Operating and maintenance expense primarily related to asbestos identified at its Buzzard Point property as part of an annual ARO study. Buzzard Point is a waterfront property in the District of Columbia occupied by an active substation and former Pepco operated steam plant building, which Pepco retired and closed in 1981.
(b)
For ComEd and PECO, the majority of the accretion is recorded as an increase to a regulatory asset due to the associated regulatory treatment.