Income Taxes (Tables)

3 Months Ended

Mar. 31, 2016

Income Tax Disclosure [Abstract]

Effective Income Tax Rate Reconciliation

									Successor	Predecessor
	Three Months Ended March 31, 2016								March 24, 2016 to March 31, 2016	January 1, 2016 to March 23, 2016
	Exelon	Generation	ComEd	PECO	BGE	Pepco(a)	DPL(a)	ACE(a)	PHI(a)	PHI
U.S. Federal statutory rate	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit (b)	(1.1)	3.7	5.1	1.0	5.2	(2.5)	(2.7)	5.9	5.4	11.9
Qualified nuclear decommissioning trust fund income	5.6	4.2	—	—	—	—	—	—	—	—
Domestic production activities deduction	—	—	—	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	—	—	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(1.6)	(1.0)	(0.3)	(0.1)	(0.1)	—	0.1	0.2	—	(0.9)
Plant basis differences	(5.5)	—	(0.1)	(9.3)	(0.6)	2.8	0.7	0.6	—	(13.5)
Production tax credits and other credits	(5.1)	(3.9)	—	—	—	—	—	—	—	—
Non-controlling interest	0.5	0.3	—	—	—	—	—	—	—	—
Merger expenses	33.6	—	—	—	—	(16.5)	(22.1)	(17.0)	(15.1)	11.1
Other	(2.0)	(1.6)	0.4	(0.9)	—	—	0.1	0.1	0.2	3.6
Effective income tax rate	59.4%	36.7%	40.1%	25.7%	39.5%	18.8%	11.1%	24.8%	25.5%	47.2%

	Three Months Ended March 31, 2015
						Predecessor
	Exelon	Generation	ComEd	PECO	BGE	PHI	Pepco	DPL	ACE
U.S. Federal statutory rate	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%	35.0%
Increase (decrease) due to:
State income taxes, net of Federal income tax benefit	2.6	2.7	5.0	1.2	5.3	7.2	5.3	5.7	5.9
Qualified nuclear decommissioning trust fund income	1.9	3.0	—	—	—	—	—	—	—
Domestic production activities deduction	(2.2)	(3.4)	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	0.2	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(0.9)	(1.4)	(0.3)	(0.1)	—	(0.5)	(0.1)	(0.2)	(1.4)
Plant basis differences	(1.3)	—	(0.3)	(6.7)	(0.3)	(4.9)	(8.5)	(0.9)	(2.8)
Production tax credits and other credits	(1.8)	(2.8)	—	—	—	—	—	—	—
Non-controlling interest	(0.7)	(1.1)	—	—	—	—	—	—	—
Other	0.4	(0.2)	0.2	—	0.2	(0.7)	(0.1)	—	(1.0)
Effective income tax rate	33.0%	31.8%	39.6%	29.4%	40.4%	36.1%	31.6%	39.6%	35.7%