Income Taxes (Tables)

6 Months Ended

Jun. 30, 2016

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

	Three Months Ended June 30, 2016
						Successor
	Exelon	Generation(e)	ComEd	PECO	BGE(f)	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	2.3	(116.7)	4.8	0.3	2.0	6.1	3.5	4.8	5.9
Qualified nuclear decommissioning trust fund income	5.7	591.2	—	—	—	—	—	—	—
Domestic production activities deduction	—	—	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	—	—	—	—	—
Amortization of investment tax credit, net deferred taxes	(1.8)	(157.8)	(0.2)	(0.1)	(0.4)	(0.3)	(0.1)	(0.6)	(1.6)
Plant basis differences(d)	(6.9)	—	(0.4)	(11.3)	(20.6)	(7.0)	(5.7)	(3.5)	(7.1)
Production tax credits and other credits	(5.8)	(603.0)	—	—	—	—	—	—	—
Noncontrolling interests	0.9	94.4	—	—	—	—	—	—	—
Statute of limitations expiration	(1.7)	(410.8)	—	—	—	—	—	—	—
Merger expenses	0.2	—	—	—	—	1.0	0.2	3.1	—
Other(c)	(3.3)	(52.3)	(0.6)	(5.2)	(1.0)	1.0	(1.0)	1.2	7.8
Effective income tax rate	24.6%	(620.0)%	38.6%	18.7%	15.0%	35.8%	31.9%	40.0%	40.0%

	Three Months Ended June 30, 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	3.9	3.4	5.6	1.4	5.3	5.3	5.0	5.0	9.9
Qualified nuclear decommissioning trust fund income	(1.0)	(1.7)	—	—	—	—	—	—	—
Domestic production activities deduction	(2.0)	(3.4)	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	0.1	—	—	—	—
Amortization of investment tax credit, net deferred taxes	(0.6)	(0.9)	(0.3)	(0.1)	(0.2)	(0.3)	—	(1.0)	(0.2)
Plant basis differences	(1.0)	—	(0.1)	(9.0)	(0.5)	(7.3)	(8.3)	(4.2)	(0.1)
Production tax credits and other credits	(1.3)	(2.2)	—	—	—	—	—	—	—
Noncontrolling interests	(0.4)	(0.6)	—	—	—	—	—	—	—
Other	1.4	2.0	0.5	0.5	0.8	1.1	(1.7)	3.7	(4.6)
Effective income tax rate	34.0%	31.6%	40.7%	27.8%	40.5%	33.8%	30.0%	38.5%	40.0%

									Successor	Predecessor
	Six Months Ended June 30, 2016								March 24, 2016 to June 30, 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)	0.8	2.6	4.9	0.7	4.6	(9.5)	(5.2)	5.9	5.2	11.9
Qualified nuclear decommissioning trust fund income	5.6	9.8	—	—	—	—	—	—	—	—
Domestic production activities deduction	—	—	—	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	—	—	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(1.7)	(2.5)	(0.2)	(0.1)	(0.1)	0.1	0.4	0.1	0.1	(0.9)
Plant basis differences(d)	(6.3)	—	(0.3)	(10.2)	(4.5)	12.6	2.0	1.0	1.7	(13.5)
Production tax credits and other credits	(5.5)	(9.6)	—	—	—	—	—	—	—	—
Noncontrolling interests	0.7	1.2	—	—	—	—	—	—	—	—
Statute of limitations expiration	(1.0)	(3.9)	—	—	—	—	—	—	—
Merger expenses	14.5	—	—	—	—	(36.1)	(30.5)	(17.7)	(18.9)	11.1
Other(c)	(2.8)	(3.8)	(0.1)	(2.4)	0.1	(0.5)	(0.1)	(0.1)	—	3.6
Effective income tax rate	39.3%	28.8%	39.3%	23.0%	35.1%	1.6%	1.6%	24.2%	23.1%	47.2%

	Six Months Ended June 30, 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	3.2	3.0	5.3	1.3	5.3	6.4	4.1	5.5	5.5
Qualified nuclear decommissioning trust fund income	0.6	0.9	—	—	—	—	—	—	—
Domestic production activities deduction	(2.1)	(3.4)	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	0.2	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(0.8)	(1.1)	(0.3)	(0.1)	(0.1)	(0.4)	—	(0.4)	(0.9)
Plant basis differences	(1.1)	—	(0.2)	(7.5)	(0.3)	(6.1)	(8.2)	(1.5)	(1.7)
Production tax credits and other credits	(1.6)	(2.5)	—	—	—	—	—	—	—
Noncontrolling interests	(0.6)	(0.8)	—	—	—	—	—	—	—
Other	0.8	0.6	0.4	0.2	—	(0.3)	(0.3)	0.8	(0.4)
Effective income tax rate	33.4%	31.7%	40.2%	28.9%	40.1%	34.6%	30.6%	39.4%	37.5%