Shareholder Equity Shareholder Equity (Tables)

12 Months Ended

Dec. 31, 2016

Shareholder [Abstract]

Schedule of Common Stock Outstanding Roll Forward [Table Text Block]

The following table presents common stock authorized and outstanding as of December 31, 2016 and 2015:

				December 31,
				2016	2015
	Par Value		Shares Authorized	Shares Outstanding
Common Stock
Exelon	no par value		2,000,000,000	924,035,059	919,924,742
ComEd	$	12.50	250,000,000	127,017,157	127,016,973
PECO	no par value		500,000,000	170,478,507	170,478,507
BGE	no par value		175,000,000	1,000	1,000
PHI Predecessor	$	0.01	400,000,000	n/a	254,289,261
Pepco	$	0.01	200,000,000	100	100
DPL	$	2.25	1,000	1,000	1,000
ACE	$	3.00	25,000,000	8,546,017	8,546,017

Schedule of Auction Market Preferred Securities by Stock Series [Table Text Block]

			December 31,
	Redemption Price (a)		2016	2015	2016		2015
			Shares Outstanding		Dollar Amount
Series (without mandatory redemption)
7.125%, 1993 Series	$	100.00	—	400,000	$	—	$	40
6.97%, 1993 Series	100.00		—	500,000	—		50
6.70%, 1993 Series	100.00		—	400,000	—		40
6.99%, 1995 Series	100.00		—	600,000	—		60
Total preference stock			—	1,900,000	$	—	$	190

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(a) Redeemable, at the option of BGE, at the indicated dollar amounts per share, plus accrued and unpaid dividends.