Income Taxes (Tables)

9 Months Ended

Sep. 30, 2016

Income Tax Disclosure [Abstract]

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

	Three Months Ended September 30, 2016
						Successor
	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	3.8	2.6	7.3	2.4	5.2	5.6	5.6	5.2	6.1
Qualified nuclear decommissioning trust fund income	4.0	7.8	—	—	—	—	—	—	—
Domestic production activities deduction	—	—	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	—	—	—	—	—
Amortization of investment tax credit, net deferred taxes	(0.9)	(1.6)	(0.6)	(0.1)	(0.2)	(0.1)	—	(0.2)	(0.1)
Plant basis differences	(3.0)	—	(1.9)	(6.7)	(0.5)	(5.0)	(6.7)	(1.3)	(4.6)
Production tax credits and other credits	(2.9)	(5.7)	(0.1)	—	—	—	—	—	—
Noncontrolling interests	0.2	0.5	—	—	—	—	—	—	—
Statute of limitations expiration	(0.1)	0.3	—	—	—	—	—	—	—
Penalties	4.3	—	27.2	—	—	—	—	—	—
Merger expenses	(0.6)	—	—	—	—	(5.7)	(2.3)	(8.6)	(2.9)
Other	(0.8)	(0.5)	0.1	0.1	(0.4)	(0.7)	(0.9)	0.1	(0.6)
Effective income tax rate	39.0%	38.4%	67.0%	30.7%	39.1%	29.1%	30.7%	30.2%	32.9%

	Three Months Ended September 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	2.7	2.1	5.0	1.2	5.3	6.2	4.8	7.4	5.4
Qualified nuclear decommissioning trust fund income	(5.4)	(12.5)	—	—	—	—	—	—	—
Domestic production activities deduction	(4.9)	(11.6)	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	0.2	—	—	—	—
Amortization of investment tax credit, net deferred taxes	(2.3)	(5.2)	(0.3)	(0.1)	(0.2)	(0.2)	(0.1)	(0.6)	(0.3)
Plant basis differences	(1.4)	—	(0.1)	(7.0)	(0.6)	(3.7)	(3.5)	(3.5)	(3.1)
Production tax credits and other credits	(3.8)	(9.0)	—	—	—	(1.2)	—	—	—
Noncontrolling interests	1.7	3.9	—	—	—	—	—	—	—
Statute of limitations expiration	(6.4)	(15.2)	—	—	—	—	—	—	—
Other	1.2	0.4	0.3	—	(0.4)	(1.1)	(1.4)	(0.8)	1.9
Effective income tax rate	16.4%	(12.1)%	39.9%	29.1%	39.3%	35.0%	34.8%	37.5%	38.9%

									Successor	Predecessor
	Nine Months Ended September 30, 2016								March 24, 2016 to September 30, 2016	January 1, 2016 to March 23, 2016
	Exelon	Generation	ComEd	PECO	BGE	Pepco	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)	2.5	2.6	5.4	1.3	4.8	23.0	310.5	5.5	4.4	11.9
Qualified nuclear decommissioning trust fund income	4.8	8.8	—	—	—	—	—	—	—	—
Domestic production activities deduction	—	—	—	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	—	—	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(1.3)	(2.0)	(0.3)	(0.1)	(0.2)	(0.2)	(17.9)	0.5	0.5	(0.9)
Plant basis differences	(4.5)	—	(0.6)	(8.8)	(3.3)	(29.0)	(98.6)	7.8	17.5	(13.5)
Production tax credits and other credits	(4.1)	(7.6)	—	—	—	—	—	—	—	—
Noncontrolling interests	0.5	0.9	—	—	—	—	—	—	—	—
Statute of limitations expiration	(0.5)	(1.7)	—	—	—	—	—	—	—
Penalties	2.3	—	5.6	—	—	—	—	—	—
Merger expenses	6.2	—	—	—	—	36.7	635.9	(35.4)	(49.8)	11.1
Other(c)	(1.8)	(2.1)	—	(1.5)	—	(2.5)	35.1	0.4	1.4	3.6
Effective income tax rate	39.1%	33.9%	45.1%	25.9%	36.3%	63.0%	900.0%	13.8%	9.0%	47.2%

	Nine Months Ended September 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	3.1	2.8	5.2	1.2	5.3	7.1	4.6	6.1	5.5
Qualified nuclear decommissioning trust fund income	(0.9)	(1.6)	—	—	—	—	—	—	—
Domestic production activities deduction	(2.8)	(4.9)	—	—	—	—	—	—	—
Health care reform legislation	—	—	—	—	0.2	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(1.2)	(1.9)	(0.3)	(0.1)	(0.1)	(0.3)	(0.1)	(0.4)	(0.5)
Plant basis differences	(1.2)	—	(0.1)	(7.3)	(0.4)	(5.0)	(6.2)	(2.0)	(2.5)
Production tax credits and other credits	(2.2)	(3.8)	—	—	—	(1.9)	—	—	—
Noncontrolling interests	—	0.1	—	—	—	—	—	—	—
Statute of limitations expiration	(1.6)	(2.9)	—	—	—	—	—	—	—
Other	0.9	0.6	0.2	0.2	(0.1)	(0.1)	(0.7)	(0.5)	0.8
Effective income tax rate	29.1%	23.4%	40.0%	29.0%	39.9%	34.8%	32.6%	38.2%	38.3%