Income Taxes (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

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

The effective income tax rate from continuing operations varies from the U.S. Federal statutory rate principally due to the following:

	Three Months Ended September 30, 2017
						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	2.2	5.6	6.6	(0.1)	5.3	5.1	2.2	5.3	5.6
Qualified nuclear decommissioning trust fund income	2.6	5.8	—	—	—	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(1.1)	(2.2)	(0.2)	(0.1)	(0.1)	(0.2)	(0.1)	(0.2)	(0.4)
Plant basis differences	(2.6)	—	(0.3)	(14.6)	(0.8)	(4.9)	(6.7)	(1.9)	(3.4)
Production tax credits and other credits	(2.2)	(4.8)	—	—	—	—	—	—	—
Noncontrolling interests	0.5	1.0	—	—	—	—	—	—	—
FitzPatrick bargain purchase gain	(0.2)	(0.4)	—	—	—	—	—	—	—
Other	(0.1)	0.3	(0.2)	(0.2)	(0.2)	0.2	—	(0.2)	0.1
Effective income tax rate	34.1%	40.3%	40.9%	20.0%	39.2%	35.2%	30.4%	38.0%	36.9%

	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	—	—	—	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(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 interest	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%

	Nine Months Ended September 30, 2017
						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	0.7	2.1	5.9	(0.1)	5.2	4.9	3.0	5.1	5.6
Qualified nuclear decommissioning trust fund income	4.0	14.0	—	—	—	—	—	—	—
Amortization of investment tax credit, including deferred taxes on basis difference	(0.9)	(2.7)	(0.2)	(0.1)	(0.1)	(0.2)	(0.1)	(0.2)	(0.4)
Plant basis differences	(3.4)	—	(0.3)	(14.4)	(0.8)	(4.6)	(6.3)	(1.8)	(3.4)
Production tax credits and other credits	(1.8)	(6.2)	—	—	—	—	—	—	—
Noncontrolling interests	0.2	0.7	—	—	—	—	—	—	—
Merger expenses	(5.4)	(2.5)	—	—	—	(11.8)	(8.0)	(10.0)	(23.0)
FitzPatrick bargain purchase gain	(3.2)	(11.2)	—	—	—	—	—	—	—
Like-kind exchange(a)	(1.7)	—	1.7	—	—	—	—	—	—
Other	—	(0.4)	0.2	—	0.2	—	(0.3)	0.6	(0.3)
Effective income tax rate	23.5%	28.8%	42.3%	20.4%	39.5%	23.3%	23.3%	28.7%	13.5%

									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(b)	ACE(b)	PHI(b)	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(c)	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	—	—	—	—	—	—	—	—
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 interest	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	(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%

_________

(a) See Like-Kind Exchange within the Other Income Tax Matters section below for further details.

(b) DPL and ACE recognized a loss before income taxes for the nine months endedSeptember 30, 2016, and PHI recognized a loss before income taxes for the period of March 24, 2016, through September 30, 2016. As a result, positive percentages represent an income tax benefit for the periods presented.

(c) Includes a remeasurement of uncertain state income tax positions for Pepco and DPL.

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The Registrants have the following unrecognized tax benefits as of September 30, 2017 and December 31, 2016:

											Successor
	Exelon		Generation		ComEd		PECO		BGE		PHI		Pepco		DPL		ACE
September 30, 2017	$	738	$	468	$	2	$	—	$	120	$	120	$	59	$	21	$	8

												Successor
	Exelon		Generation		ComEd			PECO		BGE		PHI		Pepco		DPL		ACE
December 31, 2016	$	916	$	490	$	(12	)	$	—	$	120	$	172	$	80	$	37	$	22