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Mezzanine Equity Contingently Redeemable Noncontrolling Interest (Table)
12 Months Ended
Dec. 31, 2017
Noncontrolling Interest Disclosure [Abstract]  
Noncontrolling Interest Disclosure [Text Block]
18Mezzanine Equity (Exelon, Generation and PHI)
Contingently Redeemable Noncontrolling Interests (Exelon and Generation)
In November 2015, 2015 ESA Investco, LLC, a wholly owned subsidiary of Generation, entered into an arrangement to sell a portion of its equity to a tax equity investor. Pursuant to the operating agreement, in certain circumstances the equity contributed by the noncontrolling interests holder could be contingently redeemable. These circumstances were outside of the control of Generation and the noncontrolling interests holder resulting in a portion of the noncontrolling interests being considered contingently redeemable and thus was presented in mezzanine equity on the consolidated balance sheet.
There were no changes in the contingently redeemable noncontrolling interests for the year ended December 31, 2017. The following table summarizes the changes in the contingently redeemable noncontrolling interests for the year ended December 31, 2016:
 
Contingently Redeemable NCI
Balance at December 31, 2015
$
28

Cash received from noncontrolling interests
129

Release of contingency
(157
)
Balance at December 31, 2016
$


Preferred Stock (PHI)
In connection with the PHI Merger Agreement, Exelon purchased 18,000 originally issued shares of PHI preferred stock for a purchase price of $180 million. PHI excluded the preferred stock from equity at December 31, 2015 since the preferred stock contained conditions for redemption that were not solely within the control of PHI. Management determined that the preferred stock contained embedded features requiring separate accounting consideration to reflect the potential value to PHI that any issued and outstanding preferred stock could be called and redeemed at a nominal par value upon a termination of the merger agreement under certain circumstances due to the failure to obtain required regulatory approvals. The embedded call and redemption features on the shares of the preferred stock in the event of such a termination were separately accounted for as derivatives. As of December 31, 2015, the fair value of the derivative related to the preferred stock was estimated to be $18 million based on PHI’s updated assessment and was included in current assets with a corresponding increase in preferred stock on the Consolidated Balance Sheet. Immediately prior to the merger date, PHI updated its assessment of the fair value of the derivative and reduced the fair value to zero, recording the $18 million decrease in fair value as a reduction of Other, net within PHI's predecessor period, January 1, 2016 to March 23, 2016, Statements of Operations and Comprehensive Income.
On March 23, 2016, the preferred stock was cancelled and the $180 million cash consideration previously received by PHI to issue the preferred stock was treated as additional merger purchase price consideration.
Redeemable Noncontrolling Interest [Table Text Block]
The following table summarizes the changes in the contingently redeemable noncontrolling interests for the year ended December 31, 2016:
 
Contingently Redeemable NCI
Balance at December 31, 2015
$
28

Cash received from noncontrolling interests
129

Release of contingency
(157
)
Balance at December 31, 2016
$