Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Millions	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010
Operating activities
Net income	$ 363	$ 370
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	425	555
Deferred income taxes and investment tax credits, net	178	117
Deferred fuel cost (credit)	(29)	(137)
Allowance for equity funds used during construction	(55)	(46)
Other adjustments to net income	167	136
Cash provided (used) by changes in operating assets and liabilities
Receivables	(5)	(126)
Inventory	(127)	87
Derivative collateral posted	43	(40)
Other assets	(27)	(13)
Income taxes, net	56	152
Accounts payable	1	110
Accrued pension and other benefits	(259)	(44)
Other liabilities	49	38
Net cash provided (used) by operating activities	780	1,159
Investing activities
Gross property additions	(1,004)	(1,116)
Nuclear fuel additions	(93)	(119)
Proceeds from sales of assets to affiliated companies		0
Purchases of available-for-sale securities and other investments	(3,387)	(3,815)
Proceeds from available-for-sale securities and other investments	3,364	3,792
Changes in advances to affiliated companies	0	0
Return of investment in consolidated subsidiaries	0	0
Contributions to consolidated subsidiaries	0	0
Other investing activities	82	14
Net cash provided (used) by investing activities	(1,038)	(1,244)
Financing activities
Issuance of common stock, net	26	405
Dividends paid on common stock	(366)	(354)
Dividends paid to parent	0	0
Dividends paid to parent in excess of retained earnings	0	0
Net increase (decrease) in short-term debt	314	(140)
Proceeds from issuance of long-term debt, net	494	591
Retirement of long-term debt	(700)	(400)
Changes in advances from affiliated companies	0	0
Contributions from parent	0	0
Other financing activities	(69)	(52)
Net cash provided (used) by financing activities	(301)	50
Net increase (decrease) in cash and cash equivalents	(559)	(35)
Cash and cash equivalents at beginning of period	611	725
Cash and cash equivalents at end of period	52	690
Significant noncash transactions
Accrued property additions	256	274
PEC
Operating activities
Net income	238	247
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	322	294
Deferred income taxes and investment tax credits, net	119	55
Deferred fuel cost (credit)	10	21
Allowance for equity funds used during construction	(38)	(28)
Other adjustments to net income	45	47
Cash provided (used) by changes in operating assets and liabilities
Receivables	52	(39)
Receivables from affiliated parties	17	18
Inventory	(121)	85
Other assets	(8)	(18)
Income taxes, net	78	12
Accounts payable	(30)	20
Payables to affiliated parties	(28)	15
Accrued pension and other benefits	(164)	(16)
Other liabilities	44	4
Net cash provided (used) by operating activities	536	717
Investing activities
Gross property additions	(579)	(580)
Nuclear fuel additions	(80)	(106)
Purchases of available-for-sale securities and other investments	(286)	(252)
Proceeds from available-for-sale securities and other investments	262	227
Changes in advances to affiliated companies	2	202
Other investing activities	9	0
Net cash provided (used) by investing activities	(672)	(509)
Financing activities
Dividends paid on preferred stock	(1)	(1)
Dividends paid to parent	(275)	(50)
Net increase (decrease) in short-term debt	198	0
Contributions from parent	0	14
Other financing activities	2	0
Net cash provided (used) by financing activities	(76)	(37)
Net increase (decrease) in cash and cash equivalents	(212)	171
Cash and cash equivalents at beginning of period	230	35
Cash and cash equivalents at end of period	18	206
Significant noncash transactions
Accrued property additions	181	158
PEF
Operating activities
Net income	215	221
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation, amortization and accretion	84	244
Deferred income taxes and investment tax credits, net	115	138
Deferred fuel cost (credit)	(39)	(158)
Allowance for equity funds used during construction	(17)	(18)
Other adjustments to net income	105	62
Cash provided (used) by changes in operating assets and liabilities
Receivables	(50)	(87)
Receivables from affiliated parties	(7)	2
Inventory	(8)	1
Derivative collateral posted	36	(27)
Other assets	(5)	(10)
Income taxes, net	73	122
Accounts payable	31	98
Payables to affiliated parties	(16)	(6)
Accrued pension and other benefits	(89)	(21)
Other liabilities	39	49
Net cash provided (used) by operating activities	467	610
Investing activities
Gross property additions	(419)	(543)
Nuclear fuel additions	(13)	(13)
Purchases of available-for-sale securities and other investments	(3,091)	(3,505)
Proceeds from available-for-sale securities and other investments	3,092	3,508
Other investing activities	73	15
Net cash provided (used) by investing activities	(358)	(538)
Financing activities
Dividends paid on preferred stock	(1)	(1)
Dividends paid to parent	(400)	(50)
Net increase (decrease) in short-term debt	67	0
Proceeds from issuance of long-term debt, net	0	591
Retirement of long-term debt	0	(300)
Changes in advances from affiliated companies	(3)	(214)
Other financing activities	(3)	(2)
Net cash provided (used) by financing activities	(340)	24
Net increase (decrease) in cash and cash equivalents	(231)	96
Cash and cash equivalents at beginning of period	249	17
Cash and cash equivalents at end of period	18	113
Significant noncash transactions
Accrued property additions	$ 73	$ 113

The net change during the reporting period in the noncurrent amount due to fund pension and non-pension benefits to employees, retired and disabled former employees.

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The cash inflow from parent as a source of financing that is recorded as equity.

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The net change during the reporting period in the amount of cash collateral posted for derivative instruments in a net liability position.

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The cash inflow or (outflow) for dividends paid to parent in excess of retained earnings.

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The net change during the period in the amount of current cash payments due to taxing authorities and due from taxing authorities for taxes that are based on the reporting entity's earnings.

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The net cash inflow (outflow) associated with advances to related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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The net cash inflow (outflow) associated with advances from related parties where one party can exercise control or significant influence over another party, including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

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Cash received from sales of assets to affiliated companies.

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This item represents cash inflow from dividends, returns of capital or other distributions received from unconsolidated subsidiaries accounted for using the equity method of accounting.

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Transactions that do not result in cash inflows or outflows in the period in which they occur, but affect net income and thus are removed when calculating net cash flow from operating activities using the indirect cash flow method. This element is used when there is not a more specific and appropriate element.

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits should not be reported as cash and cash equivalents.

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The net change between the beginning and ending balance of cash and cash equivalents.

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This element represents disclosure of the total aggregate cash dividends paid to the entity by consolidated subsidiaries, by unconsolidated subsidiaries, and by 50% or less owned persons accounted for using the equity method.

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The net amount of deferred income taxes and income tax credits less the tax benefit from exercise of stock options.

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The aggregate net amount of depreciation, amortization, and accretion recognized during an accounting period. As a noncash item, the net amount is added back to net income when calculating cash provided by (used in) operations using the indirect method.

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The net change during the reporting period in the aggregate amount of obligations due within one year (or one business cycle). This may include trade payables, amounts due to related parties, royalties payable, and other obligations.

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The net change during the reporting period in the obligations due for goods and services provided by the following types of related parties: a parent company and its subsidiaries, subsidiaries of a common parent, an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entities' management, an entity and its principal owners, management, or member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The net change during the reporting period in the amount due to the reporting entity for good and services provided to the following types of related parties: a parent company and its subsidiaries; subsidiaries of a common parent; an entity and trust for the benefit of employees, such as pension and profit-sharing trusts that are managed by or under the trusteeship of the entity's management, an entity and its principal owners, management, member of their immediate families, affiliates, or other parties with the ability to exert significant influence.

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The adjustment that is a result of the capitalization of construction costs representing net cost of borrowed funds and a reasonable rate on other funds used during the period of construction. As a result of this capitalization, net income is increased. When calculating net cash generated by operating activities, this adjustment must be backed out of net income. This element pertains to certain regulated industries, such as public utilities.

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The net change during the reporting period in carrying amount of capitalized fuel costs of a regulated entity that are expected to be recoverable through rate adjustments within one year or the normal operating cycle, if longer.

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The net change during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The net change during the reporting period in other operating assets not otherwise defined in the taxonomy.

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The net change during the reporting period in other operating obligations not otherwise defined in the taxonomy.

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The net change during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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The net cash inflow (outflow) from financing activity for the period.

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The net cash inflow (outflow) from investing activity.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities generally involve producing and delivering goods and providing services. Operating activity cash flows include transactions, adjustments, and changes in value that are not defined as investing or financing activities.

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The net cash from (used in) all of the entity's operating activities, including those of discontinued operations, of the reporting entity. Operating activities include all transactions and events that are not defined as investing or financing activities. Operating activities generally involve producing and delivering goods and providing services. Cash flows from operating activities are generally the cash effects of transactions and other events that enter into the determination of net income.

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The net cash inflow (outflow) from any material that is commonly used in the generation of nuclear energy.

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The net cash outflow (inflow) from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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The cash outflow from the distribution of an entity's earnings in the form of dividends to common shareholders.

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The cash outflow for the return on capital for preferred shareholders.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the additional capital contribution to the entity.

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The cash inflow associated with security instrument that either represents a creditor or an ownership relationship with the holder of the investment security with a maturity of beyond one year or normal operating cycle, if longer.

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Period Type:	duration

- Definition

The net cash inflow (outflow) from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18, 19, 20

+ Details

Name:	us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow from a borrowing net of the cash outflow from repayment of a borrowing having initial term of repayment within three months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 18

+ Details

Name:	us-gaap_ProceedsFromRepaymentsOfShortTermDebtMaturingInThreeMonthsOrLess
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash inflow associated with the sale, maturity and collection of all investments such as debt, security and so forth during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 31

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 16

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 18

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 95
-Paragraph 15

+ Details

Name:	us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph A1, A4, A5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 5
-Subparagraph b

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 29

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph a

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 38
-Subparagraph c(1)

+ Details

Name:	us-gaap_ProfitLoss
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration