Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating activities
Net income	$ 216	$ 363
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	481	425
Deferred income taxes and investment tax credits, net	169	178
Deferred fuel cost (credit)	(79)	(29)
Allowance for equity funds used during construction	(49)	(55)
Other adjustments to net income	39	167
Cash provided (used) by changes in operating assets and liabilities
Receivables	(9)	(5)
Inventory	8	(127)
Other assets	14	16
Income taxes, net	1	56
Accounts payable	70	1
Accrued pension and other benefits	(74)	(259)
Other liabilities	(36)	49
Net cash provided (used) by operating activities	751	780
Investing activities
Gross property additions	(1,080)	(1,004)
Nuclear fuel additions	(65)	(93)
Purchases of available-for-sale securities and other investments	(625)	(3,387)
Proceeds from available-for-sale securities and other investments	610	3,364
Other investing activities	81	82
Net cash provided (used) by investing activities	(1,079)	(1,038)
Financing activities
Issuance of common stock, net	6	26
Dividends paid on common stock	(446)	(366)
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
Net increase (decrease) in short-term debt	(326)	314
Proceeds from issuance of long-term debt, net	1,432	494
Retirement of long-term debt	(450)	(700)
Other financing activities	(45)	(69)
Net cash provided (used) by financing activities	171	(301)
Net increase (decrease) in cash and cash equivalents	(157)	(559)
Cash and cash equivalents at beginning of period	230	611
Cash and cash equivalents at end of period	73	52
Significant noncash transactions
Accrued property additions	237	256
Capital expenditures financed through capital leases	116	0
PEC
Operating activities
Net income	83	238
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	330	322
Deferred income taxes and investment tax credits, net	95	119
Deferred fuel cost (credit)	(3)	10
Allowance for equity funds used during construction	(32)	(38)
Other adjustments to net income	42	45
Cash provided (used) by changes in operating assets and liabilities
Receivables	(10)	52
Receivables from affiliated companies	1	17
Inventory	1	(121)
Other assets	(2)	(8)
Income taxes, net	(45)	78
Accounts payable	12	(30)
Payables to affiliated companies	27	(28)
Accrued pension and other benefits	(35)	(164)
Other liabilities	(14)	44
Net cash provided (used) by operating activities	450	536
Investing activities
Gross property additions	(683)	(579)
Nuclear fuel additions	(50)	(80)
Purchases of available-for-sale securities and other investments	(271)	(286)
Proceeds from available-for-sale securities and other investments	256	262
Changes in advances to affiliated companies	(229)	2
Other investing activities	69	9
Net cash provided (used) by investing activities	(908)	(672)
Financing activities
Dividends paid on preferred stock	(1)	(1)
Dividends paid to parent	(310)	(275)
Net increase (decrease) in short-term debt	(188)	198
Proceeds from issuance of long-term debt, net	988	0
Changes in advances from affiliated companies	(31)	3
Other financing activities	1	(1)
Net cash provided (used) by financing activities	459	(76)
Net increase (decrease) in cash and cash equivalents	1	(212)
Cash and cash equivalents at beginning of period	20	230
Cash and cash equivalents at end of period	21	18
Significant noncash transactions
Accrued property additions	150	181
Capital expenditures financed through capital leases	116	0
PEF
Operating activities
Net income	211	215
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	135	84
Deferred income taxes and investment tax credits, net	74	115
Deferred fuel cost (credit)	(76)	(39)
Allowance for equity funds used during construction	(17)	(17)
Other adjustments to net income	(16)	105
Cash provided (used) by changes in operating assets and liabilities
Receivables	(10)	(50)
Receivables from affiliated companies	(6)	(7)
Inventory	6	(8)
Other assets	19	31
Income taxes, net	31	73
Accounts payable	45	31
Payables to affiliated companies	14	(16)
Accrued pension and other benefits	(34)	(89)
Other liabilities	24	39
Net cash provided (used) by operating activities	400	467
Investing activities
Gross property additions	(380)	(419)
Nuclear fuel additions	(15)	(13)
Purchases of available-for-sale securities and other investments	(353)	(3,091)
Proceeds from available-for-sale securities and other investments	353	3,092
Other investing activities	25	73
Net cash provided (used) by investing activities	(370)	(358)
Financing activities
Dividends paid on preferred stock	(1)	(1)
Dividends paid to parent	(170)	(400)
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
Net increase (decrease) in short-term debt	(89)	67
Changes in advances from affiliated companies	235	(3)
Other financing activities	(2)	(3)
Net cash provided (used) by financing activities	(27)	(340)
Net increase (decrease) in cash and cash equivalents	3	(231)
Cash and cash equivalents at beginning of period	16	249
Cash and cash equivalents at end of period	19	18
Significant noncash transactions
Accrued property additions	$ 83	$ 73