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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2017
Asset Retirement Obligation Disclosure [Abstract]  
Nuclear Decommissioning Asset Retirement Obligation Rollforward
The following table provides a rollforward of the nuclear decommissioning ARO reflected on Exelon’s and Generation’s Consolidated Balance Sheets, from January 1, 2016 to December 31, 2017:
 
Exelon and
Generation
Nuclear decommissioning ARO at January 1, 2016
$
8,246

Accretion expense
436

Net increase for changes in and timing of estimated future cash flows
61

Costs incurred related to decommissioning plants
(9
)
Nuclear decommissioning ARO at December 31, 2016 (a)
8,734

Accretion Expense
458

Acquisition of FitzPatrick
444

Net increase for changes in and timing of estimated future cash flows
34

Costs incurred related to decommissioning plants
(8
)
Nuclear decommissioning ARO at December 31, 2017 (a)
$
9,662

__________
(a)
Includes $13 million and $10 million as the current portion of the ARO at December 31, 2017 and 2016, respectively, which is included in Other current liabilities on Exelon’s and Generation’s Consolidated Balance Sheets.
The following table provides a rollforward of the non-nuclear AROs reflected on the Registrants’ Consolidated Balance Sheets from January 1, 2016 to December 31, 2017:
 
 
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI(g)
 
Pepco
 
DPL
 
ACE
Non-nuclear AROs at
January 1, 2016
$
355

 
$
197


$
113


$
27


$
18

 
$
—

 
$
—

 
$
—

 
$
—

Merger with PHI(a)
8

 
1


—


—


—

 
—

 
—

 
—

 
—

Net increase due to changes in, and timing of, estimated future cash flows(b)
34

 
8


4


1


7

 
14

 
2

 
9

 
3

Development projects(c)
11

 
11


—


—


—

 
—

 
—

 
—

 
—

Accretion expense(d)
18

 
10

 
7

 
1

 
—

 
—

 
—

 
—

 
—

Sale of generating assets(e)
(22
)
 
(22
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Payments
(11
)
 
(6
)

(3
)

(1
)

(1
)
 
—

 
—

 
—

 
—

Non-nuclear AROs at December 31, 2016(f)
393

 
199


121


28


24

 
14

 
2


9


3

Net increase (decrease) due to changes in, and timing of, estimated future cash flows(b)
(11
)
 
(1
)

(13
)

(1
)

2

 
2

 
1

 
1

 
—

Development projects(c)
1

 
1


—


—


—

 
—

 
—

 
—

 
—

Accretion expense(d)
18

 
10


7


1


—

 
—

 
—

 
—

 
—

Deconsolidation of EGTP(h)
(7
)
 
(7
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Payments
(10
)
 
(5
)

(2
)

(1
)

(2
)
 
—

 
—

 
—

 
—

Non-nuclear AROs at December 31, 2017(f)
$
384

 
$
197


$
113


$
27


$
24

 
$
16

 
$
3


$
10


$
3

 
Predecessor
 
PHI(g)
 
2016
Non-nuclear AROs at January 1, 2016
$
8

Accretion expense
—

Non-nuclear AROs at March 23, 2016
$
8

__________
(a)
Following the completion of the PHI merger on March 23, 2016, PHI's AROs related to its unregulated business interests were transferred to Exelon and Generation.
(b)
During the year ended December 31, 2017, ComEd recorded a decrease of $1 million in Operating and maintenance expense. Generation, PECO, BGE, Pepco, DPL and ACE did not record any adjustments in Operating and maintenance expense for the year ended December 31, 2017. During the year ended December 31, 2016, Generation recorded a increase of $1 million in Operating and maintenance expense. ComEd, PECO, BGE, Pepco, DPL and ACE did not record any adjustments in Operating and maintenance expense for the year ended December 31, 2016.
(c)
Relates to new AROs recorded due to the construction of solar, wind and other non-nuclear generating sites.
(d)
For ComEd, PECO and BGE, the majority of the accretion is recorded as an increase to a regulatory asset due to the associated regulatory treatment.
(e)
Reflects a reduction to the ARO resulting primarily from the sales of the New Boston generating site and Upstream business in 2016. See Note 4—Mergers, Acquisitions and Dispositions for further information.
(f)
Excludes the current portion of the ARO at December 31, 2017 for Generation, ComEd and BGE of $1 million, $2 million and $2 million, respectively. Excludes the current portion of the ARO at December 31, 2016 for Generation, ComEd and BGE of $1 million, $2 million and $3 million, respectively. This is included in Other current liabilities on the Registrants' respective Consolidated Balance Sheets.
(g)
For PHI, the successor period includes activity for the year ended December 31, 2017 and the period of March 24, 2016 through December 31, 2016. The PHI predecessor periods include activity for the period of January 1, 2016 through March 23, 2016.
(h)
See Note 4—Mergers, Acquisitions and Dispositions for additional information.
Unrealized Gains Losses On Nuclear Decommissioning Trust Funds
The following table provides unrealized gains on NDT funds for 2017, 2016 and 2015:
 
Exelon and Generation
 
For the Years Ended December 31,
 
2017
 
2016
 
2015
Net unrealized gains (losses) on decommissioning trust
funds—Regulatory Agreement Units (a)
$
455

 
$
216

 
$
(282
)
Net unrealized gains (losses) on decommissioning trust
funds—Non-Regulatory Agreement Units (b)(c)
521

 
194

 
(197
)
__________
(a)
Net unrealized gains (losses) related to Generation’s NDT funds associated with Regulatory Agreement Units are included in Regulatory liabilities on Exelon’s Consolidated Balance Sheets and Noncurrent payables to affiliates on Generation’s Consolidated Balance Sheets.
(b)
Excludes $(10) million, $(1) million and $7 million of net unrealized gains (losses) related to the Zion Station pledged assets in 2017, 2016 and 2015, respectively. Net unrealized gains related to Zion Station pledged assets are included in the Other current liabilities and Payable for Zion Station decommissioning on Exelon’s and Generation’s Consolidated Balance Sheets in 2017 and 2016, respectively.
(c)
Net unrealized gains (losses) related to Generation’s NDT funds with Non-Regulatory Agreement Units are included within Other, net in Exelon’s and Generation’s Consolidated Statements of Operations and Comprehensive Income.
Nuclear Decommissioning Pledged Assets
The following table provides the pledged assets and payables to ZionSolutions, and withdrawals by ZionSolutions at December 31, 2017 and 2016:
 
Exelon and Generation
 
2017
 
2016
Carrying value of Zion Station pledged assets (a)
$
39

 
$
113

Payable to Zion Solutions (b)
37

 
104

Current portion of payable to Zion Solutions (c)
37

 
90

Cumulative withdrawals by Zion Solutions to pay decommissioning costs (d)
942

 
878

__________ 
(a)
Included in Other current assets within Exelon’s and Generation’s Consolidated Balance Sheets in 2017.
(b)
Excludes a liability recorded within Exelon’s and Generation’s Consolidated Balance Sheets related to the tax obligation on the unrealized activity associated with the Zion Station NDT Funds. The NDT Funds will be utilized to satisfy the tax obligations as gains and losses are realized.
(c)
Included in Other current liabilities within Exelon’s and Generation’s Consolidated Balance Sheets.
(d)
Includes project expenses to decommission Zion Station and estimated tax payments on Zion Station NDT fund earnings.