v2.4.0.6

Risk Management, Derivative Instruments And Hedging Activities (Cash Flow Hedges - Location And Amount Of Pre-Tax Recognized In Comprehensive Income) (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

$ 14

$ 18

Total Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings

(1)

(1)

Interest Rate Contracts [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

13

18

Total Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings

(1)

^[1]

(1)

^[1]

Commodity Contracts [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

1

Progress Energy [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

1

^[2]

4

^[2]

Total Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings

(4)

^[2]

Progress Energy [Member] | Interest Rate Contracts [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

4

^[2]

Total Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings

(4)

^[1],[2]

Progress Energy [Member] | Commodity Contracts [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

1

^[2]

Duke Energy Progress [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

0

^[3]

5

^[3]

Total Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings

0

^[3]

(3)

^[3]

Duke Energy Progress [Member] | Interest Rate Contracts [Member]

Derivative Instruments, Gain (Loss) [Line Items]

Amount of pre-tax gains (losses) recorded in AOCI

0

^[1],[3]

5

^[1],[3]

Total Pre-tax Gains and (Losses) Reclassified from AOCI into Earnings

$ 0

^[1],[3]

$ (3)

^[1],[3]

[1]	Amounts in AOCI related to terminated hedges are reclassified to earnings as the interest expense is recorded. The effective portion of the hedges will be amortized to interest expense over the term of the related debt.
[2]	Represents the gains and losses on cash flow hedges previously recorded in AOCI during the term of the hedging relationships and reclassified into earnings during the current period.
[3]	Represents the gains and losses on cash flow hedges previously recorded in AOCI during the term of the hedging relationships and reclassified into earnings during the current period

X

- Definition

The amount of net gains or losses on a cash flow hedge reclassified in the period to interest expense from accumulated other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=7668309&loc=d3e80784-113994



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_CashFlowHedgeGainLossReclassifiedToInterestExpenseNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4C

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624171-113959



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_UnrealizedGainLossOnInterestRateCashFlowHedgesPretaxAccumulatedOtherComprehensiveIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration