Schedule I - Condensed Financial Information of Parent (Exelon Corporate) - Condensed Balance Sheet (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Current assets
Cash and cash equivalents		$ 6,502	$ 1,878		$ 1,609		$ 1,486
Accounts receivable, net
Other		912	1,227
Regulatory assets		759	847
Other		748	865
Total current assets		15,334	11,853
Property, plant and equipment, net		57,439	52,170
Deferred debits and other assets
Regulatory assets		6,065	6,076
Other		1,445	923
Total deferred debits and other assets		22,611	22,393
Total assets	[1]	95,384	86,416
Current liabilities
Short-term Debt		533	460
Long-term debt due within one year		1,500	1,802
Accounts payable		2,883	3,048
Unamortized energy contract liabilities		100	238
Accrued expenses		2,376	1,539
Regulatory liabilities		369	310
Other		842	931
Total current liabilities		9,118	8,762
Long-term debt		23,645	19,212
Deferred credits and other liabilities
Regulatory liabilities		4,201	4,550
Pension obligations		3,385	3,366
Non-pension postretirement benefit obligations		1,618	1,742
Other		1,491	2,147
Total deferred credits and other liabilities		34,658	33,668
Total liabilities	[1]	68,062	62,283
Shareholders’ equity
Common stock		18,676	16,709
Treasury stock, at cost (35 shares at December 31, 2015 and 2014, respectively)		(2,327)	(2,327)
Retained earnings		12,068	10,910
Accumulated other comprehensive loss, net		(2,624)	(2,684)	[2]	(2,040)	[2]
Total shareholders’ equity		25,793	22,608
BGE preference stock not subject to mandatory redemption		193	193
Total liabilities and shareholders’ equity		95,384	86,416
Exelon Corporate [Member]
Current assets
Cash and cash equivalents		5,690	879		$ 3		$ 159
Accounts receivable, net
Other		272	209
Accounts receivable from affiliates		20	24
Receivables from affiliates		1,478	818
Regulatory assets		241	254
Other		5	22
Total current assets		7,706	2,206
Property, plant and equipment, net		53	54
Deferred debits and other assets
Regulatory assets		3,072	3,186
Investments in affiliates		26,119	26,670
Deferred income taxes		2,036	2,147
Receivable from affiliates		933	943
Other		404	149
Total deferred debits and other assets		32,672	33,095
Total assets		40,431	35,355
Current liabilities
Short-term Debt		188	0
Long-term debt due within one year		60	1,409
Accounts payable		5	2
Accrued expenses		440	25
Regulatory liabilities		63	51
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities		52	45
Other		1	30
Total current liabilities		809	1,562
Long-term debt		6,017	2,818
Payables to affiliates		0	182
Deferred credits and other liabilities
Regulatory liabilities		31	37
Pension obligations		7,520	7,638
Non-pension postretirement benefit obligations		0	16
Deferred income taxes		134	93
Other		122	398
Total deferred credits and other liabilities		7,807	8,182
Total liabilities		$ 14,633	$ 12,744
Commitments and Contingencies
Shareholders’ equity
Common stock		$ 18,678	$ 16,709
Treasury stock, at cost (35 shares at December 31, 2015 and 2014, respectively)		(2,327)	(2,327)
Retained earnings		12,068	10,910
Accumulated other comprehensive loss, net		(2,624)	(2,684)
Total shareholders’ equity		25,795	22,608
BGE preference stock not subject to mandatory redemption		3	3
Total liabilities and shareholders’ equity		$ 40,431	$ 35,355

[1] Exelon’s consolidated assets include $8,268 million and $8,159 million at December 31, 2015 and December 31, 2014, respectively, of certain VIEs that can only be used to settle the liabilities of the VIE. Exelon’s consolidated liabilities include $3,264 million and $2,728 million at December 31, 2015 and December 31, 2014, respectively, of certain VIEs for which the VIE creditors do not have recourse to Exelon. See Note 2–Variable Interest Entities.

[2] All amounts are net of tax. Amounts in parenthesis represent a decrease in accumulated other comprehensive income.