Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Cash flows from operating activities
Net income	$ 373	$ 656
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization (including amortization of nuclear fuel)	678	621
Equity component of AFUDC	(77)	(77)
Severance expense	39	0
FERC mitigation costs	71	0
Community support and charitable contributions expense	40	0
Amount to be refunded to customers (Note 4B)	100	0
Gains on sales of other assets	(21)	0
Deferred income taxes	257	430
Contributions to qualified pension plans	(122)	(313)
Accrued pension and other post-retirement benefit costs	137	89
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(12)	37
Receivables	(97)	(109)
Receivables from affiliate	(24)	0
Inventory	60	(151)
Other current assets	(6)	(62)
Increase (decrease) in
Accounts payable	6	(95)
Payables to affiliate	29	0
Taxes accrued	175	156
Other current liabilities	(15)	16
Other assets	0	(48)
Other liabilities	(141)	108
Net cash provided (used) by operating activities	1,450	1,258
Cash flows from investing activities
Capital expenditures	(1,695)	(1,647)
Purchases of available-for-sale securities	(947)	(4,537)
Proceeds from sales and maturities of available-for-sale securities	921	4,509
Insurance proceeds	7	78
Change in restricted cash	24	(7)
Other	81	29
Net cash provided (used) by investing activities	(1,609)	(1,575)
Proceeds from the:
Issuance of long-term debt	1,432	1,286
Issuance of common stock related to employee benefit plans	6	42
Payments for the redemption of long-term debt	(961)	(1,010)
Payments of short-term debt with original maturities greater than 90 days	(65)	0
Proceeds from issuance of short-term debt with original maturities greater than 90 days	65	0
Notes payable and commercial paper	(671)	45
Distributions to noncontrolling interests	(6)	(6)
Dividends paid	(445)	(550)
Notes payable to affiliate	635	0
Other	(4)	2
Net cash provided (used) by financing activities	(14)	(191)
Net increase (decrease) in cash and cash equivalents	(173)	(508)
Cash and cash equivalents at beginning of period	230	611
Cash and cash equivalents at end of period	57	103
Significant noncash transactions
Accrued capital expenditures	250	329
Asset retirement obligation additions	813	3
Capital expenditures financed through capital leases	137	0
PEC [Member]
Cash flows from operating activities
Net income	180	437
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization (including amortization of nuclear fuel)	499	489
Equity component of AFUDC	(50)	(53)
Severance expense	16	0
FERC mitigation costs	71	0
Community support and charitable contributions expense	40	0
Gains on sales of other assets	(2)	0
Deferred income taxes	127	222
Contributions to qualified pension plans	(60)	(207)
Accrued pension and other post-retirement benefit costs	58	32
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	(33)	(17)
Receivables	(35)	34
Receivables from affiliate	(10)	7
Inventory	23	(142)
Other current assets	(6)	88
Increase (decrease) in
Accounts payable	(20)	(44)
Payables to affiliate	23	(11)
Taxes accrued	62	55
Other current liabilities	16	(8)
Other assets	(19)	(31)
Other liabilities	(27)	37
Net cash provided (used) by operating activities	853	888
Cash flows from investing activities
Capital expenditures	(1,098)	(1,010)
Purchases of available-for-sale securities	(385)	(430)
Proceeds from sales and maturities of available-for-sale securities	359	401
Notes due from affiliate	0	(59)
Other	75	4
Net cash provided (used) by investing activities	(1,049)	(1,094)
Proceeds from the:
Issuance of long-term debt	988	496
Payments for the redemption of long-term debt	(502)	(1)
Notes payable and commercial paper	(188)	0
Dividends paid on preferred stock	(2)	(2)
Dividends to parent	(310)	(450)
Notes payable to affiliate	212	0
Other	(3)	0
Net cash provided (used) by financing activities	195	43
Net increase (decrease) in cash and cash equivalents	(1)	(163)
Cash and cash equivalents at beginning of period	20	230
Cash and cash equivalents at end of period	19	67
Significant noncash transactions
Accrued capital expenditures	144	255
Asset retirement obligation additions	684	3
Capital expenditures financed through capital leases	137	0
PEF [Member]
Cash flows from operating activities
Net income	311	418
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization (including amortization of nuclear fuel)	161	115
Equity component of AFUDC	(27)	(24)
Severance expense	7	0
Amount to be refunded to customers (Note 4B)	100	0
Gains on sales of other assets	(2)	(2)
Deferred income taxes	192	291
Contributions to qualified pension plans	(61)	(104)
Accrued pension and other post-retirement benefit costs	52	38
(Increase) decrease in
Net realized and unrealized mark-to-market and hedging transactions	64	11
Receivables	(76)	(132)
Receivables from affiliate	(12)	1
Inventory	36	(10)
Other current assets	(47)	(58)
Increase (decrease) in
Accounts payable	68	(7)
Payables to affiliate	11	(5)
Taxes accrued	110	105
Other current liabilities	(15)	27
Other assets	21	(2)
Other liabilities	(123)	58
Net cash provided (used) by operating activities	770	720
Cash flows from investing activities
Capital expenditures	(573)	(626)
Purchases of available-for-sale securities	(562)	(4,097)
Proceeds from sales and maturities of available-for-sale securities	561	4,098
Insurance proceeds	7	74
Other	4	28
Net cash provided (used) by investing activities	(563)	(523)
Proceeds from the:
Issuance of long-term debt	0	296
Payments for the redemption of long-term debt	(9)	(309)
Payments of short-term debt with original maturities greater than 90 days	(65)	0
Proceeds from issuance of short-term debt with original maturities greater than 90 days	65	0
Notes payable and commercial paper	(233)	0
Dividends paid on preferred stock	(1)	(1)
Dividends to parent	(170)	(475)
Notes payable to affiliate	213	60
Other	(3)	1
Net cash provided (used) by financing activities	(203)	(428)
Net increase (decrease) in cash and cash equivalents	4	(231)
Cash and cash equivalents at beginning of period	16	249
Cash and cash equivalents at end of period	20	18
Significant noncash transactions
Accrued capital expenditures	102	72
Asset retirement obligation additions	$ 129	$ 0