Debt and Credit Agreements Year-End (Tables)

12 Months Ended

Dec. 31, 2013

Debt Instrument [Line Items]

Schedule Of Short Term Debt [Text Block]

	Maximum Program Size at December 31,				Outstanding Commercial Paper at December 31,				Average Interest Rate on Commercial Paper Borrowings for the Year Ended December 31,
Commercial Paper Issuer		2013 (a)		2012 (a)		2013		2012	2013		2012
Exelon Corporate	$	500	$	500	$	0	$	0	0.27	%	0.47	%
Generation		5,600		5,600		0		0	0.32	%	0.45	%
ComEd		1,000		1,000		184		0	0.40	%	0.50	%
PECO		600		600		0		0	n.a.		n.a.
BGE		600		600		135		0	0.31	%	0.43	%
Total	$	8,300	$	8,300	$	319	$	0

(a) Equals aggregate bank commitments under the revolving and bilateral credit agreements (with the exception of a $75 million bilateral agreement) that backstop the commercial paper program. See discussion below and Credit Agreementstable below for items affecting effective program size.

Exelon
	2013			2012			2011
Average borrowings	$	254		$	199		$	218
Maximum borrowings outstanding		682			505			600
Average interest rates, computed on a daily basis		0.37	%		0.48	%		0.50	%
Average interest rates, at December 31		0.35	%		n.a.			0.44	%
Generation
	2013			2012			2011
Average borrowings	$	42		$	4		$	51
Maximum borrowings outstanding		291			165			304
Average interest rates, computed on a daily basis		0.32	%		0.45	%		0.48
Average interest rates, at December 31		n.a.			n.a.			n.a.
ComEd
	2013			2012			2011
Average borrowings	$	203		$	110		$	36
Maximum borrowings outstanding		446			366			407
Average interest rates, computed on a daily basis		0.40	%		0.50	%		0.71	%
Average interest rates, at December 31		0.37	%		n.a.			n.a.
BGE
	2013			2012			2011
Average borrowings	$	35		$	6		$	26
Maximum borrowings outstanding		135			76			190
Average interest rates, computed on a daily basis		0.31	%		0.43	%		0.38	%
Average interest rates, computed at December 31		0.31	%		n.a.			n.a.

Schedule Of Line Of Credit Facilities Text Block

							Available Capacity at December 31, 2013
Borrower	Aggregate Bank Commitment (a)		Facility Draws		Outstanding Letters of Credit		Actual		To Support Additional Commercial Paper (b)
Exelon Corporate	$	500	$	—	$	2	$	498	$	498
Generation		5,675		—		1,413		4,262		4,187
ComEd		1,000		—		—		1,000		816
PECO		600		—		1		599		599
BGE		600		—		—		600		465
Total	$	8,375	$	—	$	1,416	$	6,959	$	6,565

Schedule Of Credit Agreement Covenants [Text Block]

	Exelon	Generation	ComEd	PECO	BGE
Credit facility threshold	2.50 to 1	3.00 to 1	2.00 to 1	2.00 to 1	2.00 to 1
At December 31, 2013, the interest coverage ratios at the Registrants were as follows:
	Exelon	Generation	ComEd	PECO	BGE
Interest coverage ratio	7.67	11.45	5.20	8.29	7.85

Schedule Of Debt Instruments Text Block

								Maturity	December 31,
			Rates					Date	2013		2012
Long-term debt
	First Mortgage Bonds (a) (b) :
		Fixed rates	1.20	%	-	7.63	%	2013-2043	$	7,746	$	7,397
	Unsecured bonds		2.80	%	-	6.35	%	2013-2036		1,750		1,850
	Rate stabilization bonds		5.68	%	-	5.82	%	2016-2017		265		332
	Senior unsecured notes		2.00	%	-	7.60	%	2014-2042		7,571		8,021
	Pollution control notes:
		Fixed rates				4.10	%	2014		20		20
	Non-recourse debt:
		Fixed rates	2.33	%	-	5.50	%	2031-2037		1,077		238
		Variable rates	1.96	%	-	2.77	%	2013-2053		150		262
	Notes payable and other (c)		4.50	%	-	7.83	%	2014-2053		181		177
Total long-term debt										18,760		18,297
	Unamortized debt discount and premium, net									(19)		(17)
	Fair value adjustment									384		448
	Fair value hedge carrying value adjustment, net									7		17
	Long-term debt due within one year									(1,509)		(1,047)
Long-term debt									$	17,623	$	17,698
Long-term debt to financing trusts (d)
	Subordinated debentures to ComEd Financing III					6.35	%	2033	$	206	$	206
	Subordinated debentures to PECO Trust III					7.38	%	2028		81		81
	Subordinated debentures to PECO Trust IV					5.75	%	2033		103		103
	Subordinated debentures to BGE Trust					6.20	%	2043		258		258
Total long-term debt to financing trusts									$	648	$	648

(a)       Substantially all of ComEd's assets other than expressly excepted property and substantially all of PECO's assets are subject to the liens of their respective mortgage indentures.

(b)       Includes First Mortgage Bonds issued under the ComEd and PECO mortgage indentures securing pollution control bonds and notes.

(c)       Includes capital lease obligations of $41 million and$30million at December 31, 2013 and 2012, respectively. Lease payments of $4million, $4 million, $4 million, $5 million, $5 million and $19 million will be made in 2014, 2015, 2016, 2017, 2018 and thereafter, respectively.

(d)       Amounts owed to these financing trusts are recorded as debt to financing trusts within Exelon's Consolidated Balance Sheets.

Schedule Of Maturities Of Long Term Debt [Text Block]

Year	Exelon			Generation		ComEd			PECO			BGE
2014	$	1,428		$	561	$	617		$	250		$	—
2015		1,615			555		260			—			—
2016		1,346			81		665			300			300
2017		1,396			706		425			—			265
2018		1,345			5		840			500			—
Thereafter		12,278	(a)		5,644		3,093	(b)		1,334	(c)		1,708	(d)
Total	$	19,408		$	7,552	$	5,900		$	2,384		$	2,273

(a)       Includes $648million due to ComEd, PECO and BGEfinancing trusts.

(b)       Includes $206 million due to ComEd financing trust.

(c)       Includes $184 million due to PECO financing trusts.

(d)       Includes $258 million due to BGE financing trust.

Exelon Generation Co L L C [Member]

Debt Instrument [Line Items]

Schedule Of Debt Instruments Text Block

								Maturity	December 31,
			Rates					Date	2013		2012
Long-term debt
	Senior unsecured notes		2.00	%	-	7.60		2014-2042	$	6,271	$	6,721
	Social Security Administration					2.93	%	2015		1		—
	Pollution control notes:
		Fixed rates				4.10	%	2014		20		20
	Non-recourse debt:
		Fixed rates	2.33	%	-	5.50	%	2031-2037		1,077		238
		Variable rates	1.96	%	-	2.77	%	2014-2030		150		262
	Notes payable and other (a)		4.50	%	-	7.83	%	2014-2022		33		30
								1
Total long-term debt										7,552		7,271
	Fair value adjustment									166		199
	Unamortized debt discount and premium, net									11		13
	Long-term debt due within one year									(561)		(28)
Long-term debt									$	7,168	$	7,455

• Includes Generation's capital lease obligations of $33 million and$30 million atDecember 31, 2013 and 2012, respectively. Generation will make lease payments of $4 million, $4 million, $4 million, $5 million, $5 million and $11 million in 2014, 2015, 2016, 2017,2018 and thereafter, respectively.

Commonwealth Edison Co [Member]

Debt Instrument [Line Items]

Schedule Of Debt Instruments Text Block

								Maturity	December 31,
			Rates					Date	2013		2012
Long-term debt
	First Mortgage Bonds (a) (b):
		Fixed rates	1.63	%	-	7.63	%	2013-2043	$	5,546	$	5,447
	Notes payable and other (c)		6.95	%	-	7.49	%	2014-2053		148		140
Total long-term debt										5,694		5,587
	Unamortized debt discount and premium, net									(19)		(20)
	Long-term debt due within one year									(617)		(252)
Long-term debt									$	5,058	$	5,315
Long-term debt to financing trust (d)
	Subordinated debentures to ComEd Financing III					6.35	%	2042	$	206	$	206

(a)       Substantially all of ComEd's assets other than expressly excepted property are subject to the lien of its mortgage indenture.

(b)       Includes First Mortgage Bonds issued under the ComEd mortgage indenture securing pollution control bonds and notes.

(c)       Includes ComEd's capital lease obligations of $ 8 million at December 31, 2013. Lease payments of less than $1 million will be made from 2014 through expiration at 2053.

(d)       Amount owed to this financing trustis recorded as debt to financing trust within ComEd's Consolidated Balance Sheets.

PECO Energy Co [Member]

Debt Instrument [Line Items]

Schedule Of Debt Instruments Text Block

								Maturity	December 31,
			Rates					Date	2013		2012
Long-term debt
	First Mortgage Bonds (a) (b):
		Fixed rates	1.20	%	-	5.95	%	2013-2043	$	2,200	$	1,950
Total long-term debt										2,200		1,950
	Unamortized debt discount and premium, net									(3)		(3)
	Long-term debt due within one year									(250)		(300)
Long-term debt									$	1,947	$	1,647
Long-term debt to financing trusts (c)
	Subordinated debentures to PECO Trust III					7.38	%	2028	$	81	$	81
	Subordinated debentures to PECO Trust IV					5.75	%	2033		103		103
Long-term debt to financing trusts									$	184	$	184

(a)       Substantially all of PECO's assets are subject to the lien of its mortgage indenture.

(b)       Includes First Mortgage Bonds issued under the PECO mortgage indenture securing pollution control bonds and notes.

(c)       Amounts owed to this financing trust are recorded as debt to financing trusts within PECO's Consolidated Balance Sheets.

Baltimore Gas and Electric Company [Member]

Debt Instrument [Line Items]

Schedule Of Maturities Of Long Term Debt [Text Block]

								Maturity	December 31,
			Rates					Date	2013		2012
Long-term debt
		Unsecured bonds	2.80	%	-	6.35	%	2013-2036	$	1,750	$	1,850
		Rate stabilization bonds	5.68	%		5.82	%	2016-2017		265	$	332
Total long-term debt										2,015		2,182
	Unamortized debt discount and premium, net									(4)		(4)
	Long-term debt due within one year									(70)		(467)
Long-term debt									$	1,941	$	1,711
Long-term debt to financing trusts (a)
	Subordinated debentures to BGE Capital Trust II					6.20	%	2043	$	258	$	258