v2.4.0.6

Business Segments (Business Segment Data) (Details) (USD $)
In Millions, unless otherwise specified

3 Months Ended

Mar. 31, 2013

Mar. 31, 2012

Dec. 31, 2012

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

$ 5,898

$ 3,630

Operating revenues

5,898

3,630

Segment income

634

293

Add back Noncontrolling interest component

0

4

Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest

0

2

Net Income (Loss)

634

299

Segment Reporting Information Assets [Abstract]

Segment assets

113,666

113,856

U S Franchised Electric And Gas [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

5,052

2,660

^[1]

Intersegment Revenues

8

8

Segment Reporting Information, Revenue for Reportable Segment, Total

5,060

2,668

Segment income

656

136

^[1],[2]

Segments Notes To Tables [Abstract]

After-tax deferral of voluntary severance program expense

60

Deferral of voluntary severance program expense, tax

39

Segment Reporting Information Assets [Abstract]

Segment assets

98,419

U S Franchised Electric And Gas [Member] | Edwardsport IGCC Plant [Member]

Segments Notes To Tables [Abstract]

After-tax impairment charge

268

Impairment charge, tax

152

U S Franchised Electric And Gas [Member] | North Carolina Rate Case [Member]

Segments Notes To Tables [Abstract]

Approved rate increase amount by state commission

309

U S Franchised Electric And Gas [Member] | South Carolina Rate Case [Member]

Segments Notes To Tables [Abstract]

Approved rate increase amount by state commission

93

Commercial Power [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

439

564

Intersegment Revenues

13

16

Segment Reporting Information, Revenue for Reportable Segment, Total

452

580

Segment income

(42)

31

Segment Reporting Information Assets [Abstract]

Segment assets

6,937

International Energy [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

392

402

Segment Reporting Information, Revenue for Reportable Segment, Total

392

402

Segment income

97

142

Segment Reporting Information Assets [Abstract]

Segment assets

5,521

Total Reportable Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

5,883

3,626

Intersegment Revenues

21

24

Segment Reporting Information, Revenue for Reportable Segment, Total

5,904

3,650

Segment income

711

309

Segment Reporting Information Assets [Abstract]

Segment assets

110,877

All Other Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

15

4

Intersegment Revenues

20

11

Segment Reporting Information, Revenue for Reportable Segment, Total

35

15

Segment income

(77)

^[3]

(16)

Segments Notes To Tables [Abstract]

After-tax costs to achieve the merger

34

Costs to achieve the merger, tax

21

Segment Reporting Information Assets [Abstract]

Segment assets

2,696

Intersegment Eliminations [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Intersegment Revenues

(41)

(35)

Segment Reporting Information, Revenue for Reportable Segment, Total

(41)

(35)

Segment Reporting Information Assets [Abstract]

Segment assets

93

Duke Energy Carolinas [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Operating revenues

1,729

1,501

Net Income (Loss)

244

266

Segment Reporting Information Assets [Abstract]

Segment assets

30,927

30,642

Duke Energy Carolinas [Member] | All Other Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Segment income

(19)

(8)

Progress Energy [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

2,178

2,102

Intersegment Revenues

8

Operating revenues

2,186

2,102

Segment income

153

139

Add back Noncontrolling interest component

1

2

Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest

0

11

Net Income (Loss)

154

152

Segment Reporting Information Assets [Abstract]

Segment assets

37,285

37,405

Progress Energy [Member] | Total Reportable Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

2,169

2,099

Intersegment Revenues

9

1

Segment Reporting Information, Revenue for Reportable Segment, Total

2,178

2,100

Segment income

232

178

Segment Reporting Information Assets [Abstract]

Segment assets

36,786

Progress Energy [Member] | All Other Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

9

3

Segment Reporting Information, Revenue for Reportable Segment, Total

9

3

Segment income

(79)

^[4]

(39)

^[5]

Segments Notes To Tables [Abstract]

After-tax costs to achieve the merger

12

4

Costs to achieve the merger, tax

8

3

Segment Reporting Information Assets [Abstract]

Segment assets

520

Progress Energy [Member] | Intersegment Eliminations [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Intersegment Revenues

(1)

(1)

Segment Reporting Information, Revenue for Reportable Segment, Total

(1)

(1)

Segment Reporting Information Assets [Abstract]

Segment assets

(21)

Progress Energy [Member] | Franchised Electric [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

2,169

2,099

Intersegment Revenues

9

1

Segment Reporting Information, Revenue for Reportable Segment, Total

2,178

2,100

Segment income

232

178

Segment Reporting Information Assets [Abstract]

Segment assets

36,786

Duke Energy Progress [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Operating revenues

1,216

1,090

Net Income (Loss)

110

52

Segment Reporting Information Assets [Abstract]

Segment assets

18,246

18,068

Duke Energy Progress [Member] | All Other Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Segment income

(7)

(3)

Duke Energy Florida [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Operating revenues

968

1,010

Net Income (Loss)

110

128

Segment Reporting Information Assets [Abstract]

Segment assets

14,985

15,180

Duke Energy Florida [Member] | All Other Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Segment income

(5)

(1)

Duke Energy Ohio [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

747

912

Operating revenues

747

912

Segment income

(21)

74

Net Income (Loss)

(21)

74

Segment Reporting Information Assets [Abstract]

Segment assets

10,583

10,560

Duke Energy Ohio [Member] | Total Reportable Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

747

912

Intersegment Revenues

11

15

Segment Reporting Information, Revenue for Reportable Segment, Total

758

927

Segment income

(14)

78

Segment Reporting Information Assets [Abstract]

Segment assets

10,634

Duke Energy Ohio [Member] | All Other Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Segment income

(7)

(4)

Segment Reporting Information Assets [Abstract]

Segment assets

109

Duke Energy Ohio [Member] | Intersegment Eliminations [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

0

0

Intersegment Revenues

(11)

(15)

Segment Reporting Information, Revenue for Reportable Segment, Total

(11)

(15)

Segment Reporting Information Assets [Abstract]

Segment assets

(160)

Duke Energy Ohio [Member] | DEO Commercial Power [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

255

439

Intersegment Revenues

11

15

Segment Reporting Information, Revenue for Reportable Segment, Total

266

454

Segment income

(67)

44

Segment Reporting Information Assets [Abstract]

Segment assets

4,120

Duke Energy Ohio [Member] | Franchised Electric & Gas [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Unaffiliated Revenues

492

473

Intersegment Revenues

0

Segment Reporting Information, Revenue for Reportable Segment, Total

492

473

Segment income

53

34

Segment Reporting Information Assets [Abstract]

Segment assets

6,514

Duke Energy Indiana [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Operating revenues

724

688

Net Income (Loss)

90

(167)

Segment Reporting Information Assets [Abstract]

Segment assets

10,060

10,008

Duke Energy Indiana [Member] | All Other Segments [Member]

Segment Reporting Information, Profit (Loss) [Abstract]

Segment income

$ (4)

$ (4)

[1]	On January 25, 2012 and January 27, 2012, the Duke Energy Carolinas' South Carolina and North Carolina rate case settlement agreements were approved by the PSCSC and NCUC, respectively. Among other things, the rate case settlements included an annual base rate increase of $309 million in North Carolina and a $93 million annual base rate increase in South Carolina, both beginning in February 2012. The impact of these rates impacts USFE&G.
[2]	USFE&G recorded an after-tax impairment charge of $268 million, net of tax of $152 million, related to Duke Energy Indiana's Edwardsport Integrated Gasification Combined Cycle (IGCC) project. USFE&G also recorded the reversal of expenses of $60 million, net of tax of $39 million, related to a prior year Voluntary Opportunity Plan in accordance with Duke Energy Carolinas' 2011 rate case.
[3]	Other includes after-tax costs to achieve the merger with Progress Energy of $34 million, net of tax of $21 million. See Note 2 for additional information.
[4]	Other includes after-tax costs to achieve the merger with Duke Energy of $12 million, net of tax of $8 million. See Note 2 for additional information.
[5]	Other includes after-tax costs to achieve the merger with Duke Energy of $4 million, net of tax of $3 million. See Note 2 for additional information.

X

- Definition

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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X

- Definition

Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 280

-SubTopic 10

-Section 50

-Paragraph 22

-Subparagraph (a),(b),(c)

-URI http://asc.fasb.org/extlink&oid=6534315&loc=d3e8736-108599



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a, b, c

-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.

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