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Asset Retirement Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2015 to December 31, 2016:
 
 
Exelon and
Generation
Nuclear decommissioning ARO at January 1, 2015
$
6,961

Accretion expense
387

Net increase for changes in and timing of estimated future cash flows
901

Costs incurred related to decommissioning plants
(3
)
Nuclear decommissioning ARO at December 31, 2015 (a)
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

_________________________
(a)
Includes $10 million and $7 million as the current portion of the ARO at December 31, 2016 and 2015, respectively, which is included in Other current liabilities on Exelon’s and Generation’s Consolidated Balance Sheets.
Unrealized Gains Losses On Nuclear Decommissioning Trust Funds
The following table provides unrealized gains on NDT funds for 2016, 2015 and 2014:
 
 
Exelon and Generation
 
For the Years Ended December 31,
 
2016
 
2015
 
2014
Net unrealized gains (losses) on decommissioning trust
funds—Regulatory Agreement Units (a)
$
216

 
$
(282
)
 
$
180

Net unrealized gains (losses) on decommissioning trust
funds—Non-Regulatory Agreement Units (b)(c)
194

 
(197
)
 
134

_______________________
(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 $(1) million, $7 million and $29 million of net unrealized gains (losses) related to the Zion Station pledged assets in 2016, 2015 and 2014, respectively. Net unrealized gains related to Zion Station pledged assets are included in the Payable for Zion Station decommissioning on Exelon’s and Generation’s Consolidated Balance Sheets.
(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, 2016 and 2015:
 
 
Exelon and Generation
 
2016
 
2015
Carrying value of Zion Station pledged assets
$
113

 
$
206

Payable to Zion Solutions (a)
104

 
189

Current portion of payable to Zion Solutions (b)
90

 
99

Cumulative withdrawals by Zion Solutions to pay decommissioning costs (c)
878

 
786

___________________ 
(a)
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.
(b)
Included in Other current liabilities within Exelon’s and Generation’s Consolidated Balance Sheets.
(c)
Includes project expenses to decommission Zion Station and estimated tax payments on Zion Station NDT fund earnings.
Non Nuclear Decommissioning Asset Retirement Obligation Rollforward
The following table provides a rollforward of the non-nuclear AROs reflected on the Registrants’ Consolidated Balance Sheets from January 1, 2015 to December 31, 2016:
 
 
 
 
 
 
 
 
 
 
 
 
Successor
 
 
 
 
 
 
 
Exelon
 
Generation
 
ComEd
 
PECO
 
BGE
 
PHI(f)
 
Pepco
 
DPL
 
ACE
Non-nuclear AROs at
January 1, 2015
$
346

 
$
194


$
104


$
30


$
18

 
$
—

 
$
—

 
$
—

 
$
—

Net (decrease) increase due to changes in, and timing of, estimated future cash flows(a)
(10
)
 
(12
)

6


(4
)

—

 
—

 
—

 
—

 
—

Development projects(b)
10

 
10


—


—


—

 
—

 
—

 
—

 
—

Accretion expense(c)
16

 
10


5


1


—

 
—

 
—

 
—

 
—

Sale of generating assets(d)
(2
)
 
(2
)
 
—

 
—

 
—

 
—

 
—

 
—

 
—

Payments
(5
)
 
(3
)

(2
)

—


—

 
—

 
—

 
—

 
—

Non-nuclear AROs at December 31, 2015(e)
355

 
197


113


27


18

 
—

 
—


—


—

Merger with PHI (g)
8

 
1

 
—

 
—

 
—

 
—

 
—

 
—

 
—

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

 
8


4


1


7

 
14

 
2

 
9

 
3

Development projects(b)
11

 
11


—


—


—

 
—

 
—

 
—

 
—

Accretion expense(c)
18

 
10


7


1


—

 
—

 
—

 
—

 
—

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

 
—

 
—

 
—

 
—

 
—

 
—

Payments
(11
)
 
(6
)

(3
)

(1
)

(1
)
 
—

 
—

 
—

 
—

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

 
$
199


$
121


$
28


$
24

 
$
14

 
$
2


$
9


$
3


 
Predecessor
 
PHI(f)
Non-nuclear AROs at January 1, 2015
$
7

Accretion expense(c)
1

Non-nuclear AROs at December 31, 2015
$
8

 
 
Non-nuclear AROs at March 23, 2016
$
8

________________________
(a)
During the year ended December 31, 2016, Generation recorded an increase of $1 million in Operating and maintenance expense. ComEd, PECO and BGE did not record any adjustments in Operating and maintenance expense for the year ended December 31, 2016. During the year ended December 31, 2015, Generation recorded a decrease of $(2) million in Operating and maintenance expense. ComEd, PECO and BGE did not record any adjustments in Operating and maintenance expense for the year ended December 31, 2015.
(b)
Relates to new AROs recorded due to the construction of solar, wind and other non-nuclear generating sites.
(c)
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.
(d)
Reflects a reduction to the ARO resulting primarily from the sales of the New Boston generating site and Upstream business in 2016 and Schuylkill generating station in 2015. See Note 4 — Mergers, Acquisitions, and Dispositions for further information.
(e)
Excludes $1 million, $2 million and $3 million as the current portion of the ARO at December 31, 2016 for Generation, ComEd and BGE, respectively. Excludes $5 million, $2 million and $1 million as the current portion of the ARO at December 31, 2015 for Generation, ComEd and BGE, respectively. This is included in Other current liabilities on the Registrants' respective Consolidated Balance Sheets.
(f)
For PHI, the successor period includes activity for the period of March 24, 2016 through December 31, 2016. The PHI predecessor periods include activity for the year ended December 31, 2015 and the period January 1, 2016 through March 23, 2016.
(g)
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.