v2.4.0.6

Investments In Debt And Equity Securities (Available-For-Sale Investments) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | $ 1,461 |  |  | $ 1,216 |
Gross Unrealized Holding Losses | 33 |  |  | 30 |
Estimated Fair Value | 5,277 |  |  | 4,932 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |  |
Realized gains | 31 |  | 21 |  |
Realized losses | 7 |  | 2 |  |
Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1,439 |  |  | 1,199 |
Gross Unrealized Holding Losses | 26 |  |  | 23 |
Estimated Fair Value | 4,546 |  |  | 4,263 |
Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 22 | [1] |  | 17 | [1]
Gross Unrealized Holding Losses | 7 | [1] |  | 7 | [1]
Estimated Fair Value | 731 | [1] |  | 669 | [1]
Cash and Cash Equivalents [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 91 |  |  | 105 |
Cash and Cash Equivalents [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 21 |  |  | 17 |
Equity Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1,380 |  |  | 1,132 |
Gross Unrealized Holding Losses | 19 |  |  | 19 |
Estimated Fair Value | 3,104 |  |  | 2,837 |
Equity Securities [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 16 |  |  | 10 |
Gross Unrealized Holding Losses |  |  |  | 0 |
Estimated Fair Value | 84 |  |  | 63 |
Corporate Debt Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 17 |  |  | 21 |
Gross Unrealized Holding Losses | 2 |  |  | 1 |
Estimated Fair Value | 333 |  |  | 338 |
Corporate Debt Securities [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1 |  |  | 2 |
Gross Unrealized Holding Losses |  |  |  | 0 |
Estimated Fair Value | 347 |  |  | 381 |
Municipal Bonds [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 10 |  |  | 12 |
Gross Unrealized Holding Losses | 1 |  |  | 1 |
Estimated Fair Value | 189 |  |  | 194 |
Municipal Bonds [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 4 |  |  | 4 |
Gross Unrealized Holding Losses | 1 |  |  | 1 |
Estimated Fair Value | 75 |  |  | 70 |
US Treasury and Government [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 20 |  |  | 24 |
Gross Unrealized Holding Losses | 2 |  |  | 1 |
Estimated Fair Value | 666 |  |  | 625 |
US Treasury and Government [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains |  |  |  | 0 |
Estimated Fair Value | 73 |  |  | 23 |
Auction Rate Securities [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Losses | 6 |  |  | 6 |
Estimated Fair Value | 28 |  |  | 29 |
Other Debt Obligations [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 12 |  |  | 10 |
Gross Unrealized Holding Losses | 2 |  |  | 1 |
Estimated Fair Value | 163 |  |  | 164 |
Other Debt Obligations [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1 |  |  | 1 |
Estimated Fair Value | 103 |  |  | 86 |
Duke Energy Carolinas [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 764 |  |  | 632 |
Gross Unrealized Holding Losses | 10 |  |  | 9 |
Estimated Fair Value | 2,520 |  |  | 2,364 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |  |
Realized gains | 25 |  | 20 |  |
Realized losses | 4 |  | 2 |  |
Duke Energy Carolinas [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 764 |  |  | 632 |
Gross Unrealized Holding Losses | 9 |  |  | 8 |
Estimated Fair Value | 2,517 |  |  | 2,361 |
Duke Energy Carolinas [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Losses | 1 | [2] |  | 1 | [2]
Estimated Fair Value | 3 | [2] |  | 3 | [2]
Duke Energy Carolinas [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 41 |  |  | 40 |
Duke Energy Carolinas [Member] | Equity Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 736 |  |  | 600 |
Gross Unrealized Holding Losses | 4 |  |  | 5 |
Estimated Fair Value | 1,735 |  |  | 1,592 |
Duke Energy Carolinas [Member] | Corporate Debt Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 9 |  |  | 11 |
Gross Unrealized Holding Losses | 2 |  |  | 1 |
Estimated Fair Value | 239 |  |  | 250 |
Duke Energy Carolinas [Member] | Municipal Bonds [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 0 |  |  | 2 |
Estimated Fair Value | 21 |  |  | 40 |
Duke Energy Carolinas [Member] | US Treasury and Government [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 8 |  |  | 10 |
Gross Unrealized Holding Losses | 1 |  |  |  |
Estimated Fair Value | 345 |  |  | 304 |
Duke Energy Carolinas [Member] | Auction Rate Securities [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Losses | 1 |  |  | 1 |
Estimated Fair Value | 3 |  |  | 3 |
Duke Energy Carolinas [Member] | Other Debt Obligations [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 11 |  |  | 9 |
Gross Unrealized Holding Losses | 2 |  |  | 2 |
Estimated Fair Value | 136 |  |  | 135 |
Progress Energy [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 678 |  |  | 570 |
Gross Unrealized Holding Losses | 17 |  |  | 15 |
Estimated Fair Value | 2,090 |  |  | 1,959 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |  |
Realized gains | 5 |  | 7 |  |
Realized losses | 2 |  | 3 |  |
Progress Energy [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 675 |  |  | 567 |
Gross Unrealized Holding Losses | 17 |  |  | 15 |
Estimated Fair Value | 2,029 |  |  | 1,902 |
Progress Energy [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 3 | [1] |  | 3 | [1]
Estimated Fair Value | 61 | [1] |  | 57 | [1]
Progress Energy [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 50 |  |  | 65 |
Progress Energy [Member] | Cash and Cash Equivalents [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 21 |  |  | 17 |
Progress Energy [Member] | Equity Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 644 |  |  | 532 |
Gross Unrealized Holding Losses | 15 |  |  | 14 |
Estimated Fair Value | 1,369 |  |  | 1,245 |
Progress Energy [Member] | Corporate Debt Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 8 |  |  | 9 |
Estimated Fair Value | 94 |  |  | 89 |
Progress Energy [Member] | Municipal Bonds [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 10 |  |  | 11 |
Gross Unrealized Holding Losses | 1 |  |  | 1 |
Estimated Fair Value | 168 |  |  | 154 |
Progress Energy [Member] | Municipal Bonds [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 3 |  |  | 3 |
Estimated Fair Value | 40 |  |  | 40 |
Progress Energy [Member] | US Treasury and Government [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 12 |  |  | 14 |
Gross Unrealized Holding Losses | 1 |  |  |  |
Estimated Fair Value | 321 |  |  | 321 |
Progress Energy [Member] | Other Debt Obligations [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1 |  |  | 1 |
Estimated Fair Value | 27 |  |  | 28 |
Duke Energy Progress [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 435 |  |  | 363 |
Gross Unrealized Holding Losses | 12 |  |  | 11 |
Estimated Fair Value | 1,360 |  |  | 1,278 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |  |
Realized gains | 2 |  | 5 |  |
Realized losses | 1 |  | 2 |  |
Duke Energy Progress [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 435 |  |  | 363 |
Gross Unrealized Holding Losses | 12 |  |  | 11 |
Estimated Fair Value | 1,356 |  |  | 1,275 |
Duke Energy Progress [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 4 | [1] |  | 3 | [1]
Duke Energy Progress [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 39 |  |  | 55 |
Duke Energy Progress [Member] | Cash and Cash Equivalents [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 4 |  |  | 3 |
Duke Energy Progress [Member] | Equity Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 413 |  |  | 337 |
Gross Unrealized Holding Losses | 11 |  |  | 11 |
Estimated Fair Value | 894 |  |  | 811 |
Duke Energy Progress [Member] | Corporate Debt Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 6 |  |  | 8 |
Estimated Fair Value | 84 |  |  | 78 |
Duke Energy Progress [Member] | Municipal Bonds [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 4 |  |  | 4 |
Estimated Fair Value | 95 |  |  | 80 |
Duke Energy Progress [Member] | US Treasury and Government [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 11 |  |  | 13 |
Gross Unrealized Holding Losses | 1 |  |  |  |
Estimated Fair Value | 233 |  |  | 241 |
Duke Energy Progress [Member] | Other Debt Obligations [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1 |  |  | 1 |
Estimated Fair Value | 11 |  |  | 10 |
Duke Energy Florida [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 243 |  |  | 207 |
Gross Unrealized Holding Losses | 5 |  |  | 4 |
Estimated Fair Value | 716 |  |  | 668 |
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract] |  |  |  |  |
Realized gains | 3 |  | 2 |  |
Realized losses | 1 |  | 1 |  |
Duke Energy Florida [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 240 |  |  | 204 |
Gross Unrealized Holding Losses | 5 |  |  | 4 |
Estimated Fair Value | 673 |  |  | 627 |
Duke Energy Florida [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 3 | [3] |  | 3 | [3]
Estimated Fair Value | 43 | [3] |  | 41 | [3]
Duke Energy Florida [Member] | Cash and Cash Equivalents [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 11 |  |  | 10 |
Duke Energy Florida [Member] | Cash and Cash Equivalents [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Estimated Fair Value | 3 |  |  | 1 |
Duke Energy Florida [Member] | Equity Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 231 |  |  | 194 |
Gross Unrealized Holding Losses | 4 |  |  | 4 |
Estimated Fair Value | 475 |  |  | 434 |
Duke Energy Florida [Member] | Corporate Debt Securities [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 2 |  |  | 1 |
Estimated Fair Value | 10 |  |  | 11 |
Duke Energy Florida [Member] | Municipal Bonds [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 6 |  |  | 7 |
Gross Unrealized Holding Losses | 1 |  |  | 0 |
Estimated Fair Value | 73 |  |  | 74 |
Duke Energy Florida [Member] | Municipal Bonds [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 3 |  |  | 3 |
Estimated Fair Value | 40 |  |  | 40 |
Duke Energy Florida [Member] | US Treasury and Government [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1 |  |  | 1 |
Estimated Fair Value | 88 |  |  | 80 |
Duke Energy Florida [Member] | Other Debt Obligations [Member] | Ndtf [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 0 |  |  | 1 |
Estimated Fair Value | 16 |  |  | 18 |
Duke Energy Indiana [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 15 |  |  | 10 |
Gross Unrealized Holding Losses |  |  |  | 0 |
Estimated Fair Value | 83 |  |  | 78 |
Duke Energy Indiana [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 15 | [1] |  | 10 | [1]
Gross Unrealized Holding Losses |  |  |  | 0 | [1]
Estimated Fair Value | 83 | [1] |  | 78 | [1]
Duke Energy Indiana [Member] | Equity Securities [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 14 |  |  | 9 |
Gross Unrealized Holding Losses |  |  |  | 0 |
Estimated Fair Value | 54 |  |  | 50 |
Duke Energy Indiana [Member] | Municipal Bonds [Member] | Other Classification [Member] |  |  |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |  |  |
Gross Unrealized Holding Gains | 1 |  |  | 1 |
Estimated Fair Value | $ 29 |  |  | $ 28 |
[1] | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
[2] | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
[3] | These amounts are recorded in Other within Investments and Other Assets on the Condensed Balance sheets.

X
- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7534914&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 12 -Subparagraph b -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. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 21 -Subparagraph a -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
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