Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Policies [Abstract]

Schedule Of Capitalized Software

The following table presents net unamortized capitalized software costs and amortization of capitalized software costs by year:

Net unamortized software costs											Successor
	Exelon		Generation		ComEd		PECO		BGE		PHI		Pepco		DPL		ACE
December 31, 2017	$	834	$	173	$	227	$	111	$	179	$	133	$	2	$	1	$	1
December 31, 2016	808		173		213		91		164		153		1		1		1

Amortization of capitalized software costs	Exelon		Generation		ComEd		PECO		BGE		Pepco			DPL		ACE
2017	$	270	$	73	$	73	$	39	$	46	$	—		$	—	$	—
2016	255		72		62		33		44		—			—		—
2015	208		73		47		33		46		(2		)	—		—

	Successor				Predecessor
PHI	For the Year Ended December 31, 2017		March 24, 2016 to December 31, 2016		January 1, 2016 to March 23, 2016		For the Year Ended December 31, 2015
Amortization of capitalized software costs	$	34	$	29	$	8	$	36

Schedule Of Capitalized Interest And AFUDC

The following table summarizes total incurred interest, capitalized interest and credits to AFUDC by year:

		Exelon		Generation		ComEd		PECO		BGE		Pepco		DPL		ACE
2017	Total incurred interest(a)	$	1,658	$	502	$	369	$	130	$	111	$	133	$	54	$	64
	Capitalized interest	63		63		—		—		—		—		—		—
	Credits to AFUDC debt and equity	108		—		20		12		22		34		10		9
2016	Total incurred interest(a)	$	1,678	$	472	$	469	$	127	$	114	$	137	$	52	$	65
	Capitalized interest	108		107		—		—		—		—		—		—
	Credits to AFUDC debt and equity	98		—		22		11		30		29		7		9
2015	Total incurred interest(a)	$	1,170	$	445	$	336	$	116	$	113	$	131	$	51	$	65
	Capitalized interest	79		79		—		—		—		—		—		—
	Credits to AFUDC debt and equity	44		—		9		7		28		19		2		2

	Successor				Predecessor
PHI	For the Year Ended December 31, 2017		March 24, 2016 to December 31, 2016		January 1, 2016 to March 23, 2016		For the Year Ended December 31, 2015
Total incurred interest(a)	$	263	$	207	$	68	$	289
Credits to AFUDC debt and equity	54		35		10		23