Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Utility Plant
Utility plant in service	$ 31,065	$ 29,708
Accumulated depreciation	(12,001)	(11,567)
Utility plant in service, net	19,064	18,141
Other utility plant, net	217	220
Construction work in progress	2,449	2,205
Nuclear fuel, net of amortization	767	674
Total utility plant, net	22,497	21,240
Current assets
Cash and cash equivalents	230	611
Receivables, net	889	1,033
Notes receivable from affiliated companies	0	0
Inventory	1,438	1,226
Regulatory assets	275	176
Derivative collateral posted	147	164
Deferred tax assets	371	156
Prepayments and other current assets	133	110
Total current assets	3,483	3,476
Deferred debits and other assets
Regulatory assets	3,025	2,374
Nuclear decommissioning trust funds	1,647	1,571
Miscellaneous other property and investments	407	413
Goodwill	3,655	3,655
Other assets and deferred debits	345	325
Total deferred debits and other assets	9,079	8,338
Total assets	35,059	33,054
Common stock equity
Common stock	7,434	7,343
Accumulated other comprehensive loss	(165)	(125)
Retained earnings	2,752	2,805
Total common stock equity	10,021	10,023
Noncontrolling interests	4	4
Total equity	10,025	10,027
Preferred stock of subsidiaries	93	93
Long-term debt, affiliate	273	273
Long-term debt, net	11,718	11,864
Total capitalization	22,109	22,257
Current liabilities
Current portion of long-term debt	950	505
Short-term debt	671	0
Notes payable to affiliated companies	0	0
Accounts payable	909	994
Interest accrued	200	216
Dividends declared	78	184
Customer deposits	340	324
Derivative liabilities	436	259
Accrued compensation and other benefits	195	175
Other current liabilities	306	298
Total current liabilities	4,085	2,955
Deferred credits and other liabilities
Noncurrent income tax liabilities	2,355	1,696
Accumulated deferred investment tax credits	103	110
Regulatory liabilities	2,700	2,635
Asset retirement obligations	1,265	1,200
Accrued pension and other benefits	1,625	1,514
Derivative liabilities	352	278
Other liabilities and deferred credits	465	409
Total deferred credits and other liabilities	8,865	7,842
Commitments and contingencies (Notes 21 and 22)	0	0
Total capitalization and liabilities	35,059	33,054
PEC
Utility Plant
Utility plant in service	17,439	16,388
Accumulated depreciation	(7,567)	(7,324)
Utility plant in service, net	9,872	9,064
Other utility plant, net	181	184
Construction work in progress	1,294	1,233
Nuclear fuel, net of amortization	540	480
Total utility plant, net	11,887	10,961
Current assets
Cash and cash equivalents	20	230
Receivables, net	492	519
Receivables from affiliated companies	13	44
Inventory	775	590
Deferred fuel cost	31	71
Income taxes receivable	8	90
Deferred tax assets	142	65
Prepayments and other current assets	68	47
Total current assets	1,549	1,656
Deferred debits and other assets
Regulatory assets	1,310	987
Nuclear decommissioning trust funds	1,088	1,017
Miscellaneous other property and investments	188	183
Other assets and deferred debits	80	95
Total deferred debits and other assets	2,666	2,282
Total assets	16,102	14,899
Common stock equity
Common stock	2,148	2,130
Accumulated other comprehensive loss	(71)	(33)
Retained earnings	3,011	3,083
Total common stock equity	5,088	5,180
Total equity	5,088	5,180
Preferred stock of subsidiaries	59	59
Preferred stock	59	59
Long-term debt, net	3,693	3,693
Total capitalization	8,840	8,932
Current liabilities
Current portion of long-term debt	500	0
Short-term debt	188	0
Notes payable to affiliated companies	31	0
Accounts payable	527	534
Payables to affiliated companies	41	109
Interest accrued	77	74
Customer deposits	116	106
Derivative liabilities	130	53
Accrued compensation and other benefits	110	99
Other current liabilities	85	81
Total current liabilities	1,805	1,056
Deferred credits and other liabilities
Noncurrent income tax liabilities	1,976	1,608
Accumulated deferred investment tax credits	98	104
Regulatory liabilities	1,543	1,461
Asset retirement obligations	896	849
Accrued pension and other benefits	687	723
Other liabilities and deferred credits	257	166
Total deferred credits and other liabilities	5,457	4,911
Commitments and contingencies (Notes 21 and 22)	0	0
Total capitalization and liabilities	16,102	14,899
PEF
Utility Plant
Utility plant in service	13,461	13,155
Accumulated depreciation	(4,356)	(4,168)
Utility plant in service, net	9,105	8,987
Held for future use	36	36
Construction work in progress	1,155	972
Nuclear fuel, net of amortization	227	194
Total utility plant, net	10,523	10,189
Current assets
Cash and cash equivalents	16	249
Receivables, net	372	496
Receivables from affiliated companies	19	11
Inventory	663	636
Regulatory assets	244	105
Derivative collateral posted	123	140
Deferred tax assets	138	77
Prepayments and other current assets	39	29
Total current assets	1,614	1,743
Deferred debits and other assets
Regulatory assets	1,602	1,387
Nuclear decommissioning trust funds	559	554
Miscellaneous other property and investments	42	43
Other assets and deferred debits	144	140
Total deferred debits and other assets	2,347	2,124
Total assets	14,484	14,056
Common stock equity
Common stock	1,757	1,750
Accumulated other comprehensive loss	(27)	(4)
Retained earnings	2,945	3,144
Total common stock equity	4,675	4,890
Total equity	4,675	4,890
Preferred stock of subsidiaries	34	34
Preferred stock	34	34
Long-term debt, net	4,482	4,182
Total capitalization	9,191	9,106
Current liabilities
Current portion of long-term debt	0	300
Short-term debt	233	0
Notes payable to affiliated companies	8	9
Accounts payable	358	439
Payables to affiliated companies	25	60
Interest accrued	54	83
Customer deposits	224	218
Derivative liabilities	268	188
Accrued compensation and other benefits	53	47
Other current liabilities	112	121
Total current liabilities	1,335	1,465
Deferred credits and other liabilities
Noncurrent income tax liabilities	1,405	1,065
Regulatory liabilities	1,071	1,084
Asset retirement obligations	369	351
Accrued pension and other benefits	598	522
Capital lease obligations	189	199
Derivative liabilities	231	190
Other liabilities and deferred credits	95	74
Total deferred credits and other liabilities	3,958	3,485
Commitments and contingencies (Notes 21 and 22)	0	0
Total capitalization and liabilities	$ 14,484	$ 14,056