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Fair Value Of Financial Assets And Liabilities (Fair Value Measurement Amounts For Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Dec. 31, 2012
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments in available-for-sale auction rate securities, fair value | $ 28 | [1] | $ 29 | [1]
Nuclear decommissioning trust fund equity securities | 3,104 |  | 2,837 |
Nuclear decommissioning trust fund debt securities | 1,432 |  | 1,405 |
Other long-term trading and available-for-sale equity securities | 93 | [2] | 72 | [2]
Other trading and available-for sale debt securities | 634 | [3] | 602 | [3]
Derivative assets | 75 | [2] | 103 | [2]
Assets, Fair Value Disclosure, Total | 5,366 |  | 5,048 |
Derivative liabilities | (611) | [4] | (756) | [4]
Net Assets Fair Value, Total | 4,755 |  | 4,292 |
Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 3,026 |  | 2,762 |
Nuclear decommissioning trust fund debt securities | 356 |  | 317 |
Other long-term trading and available-for-sale equity securities | 84 | [2] | 63 | [2]
Other trading and available-for sale debt securities | 94 | [3] | 40 | [3]
Derivative assets | 1 | [2] | 18 | [2]
Assets, Fair Value Disclosure, Total | 3,561 |  | 3,200 |
Derivative liabilities | (77) | [4] | (17) | [4]
Net Assets Fair Value, Total | 3,484 |  | 3,183 |
Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 57 |  | 54 |
Nuclear decommissioning trust fund debt securities | 1,027 |  | 1,040 |
Other long-term trading and available-for-sale equity securities | 9 | [2] | 9 | [2]
Other trading and available-for sale debt securities | 540 | [3] | 562 | [3]
Derivative assets | 20 | [2] | 22 | [2]
Assets, Fair Value Disclosure, Total | 1,653 |  | 1,687 |
Derivative liabilities | (398) | [4] | (591) | [4]
Net Assets Fair Value, Total | 1,255 |  | 1,096 |
Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments in available-for-sale auction rate securities, fair value | 28 | [1] | 29 | [1]
Nuclear decommissioning trust fund equity securities | 21 |  | 21 |
Nuclear decommissioning trust fund debt securities | 49 |  | 48 |
Derivative assets | 54 | [2] | 63 | [2]
Assets, Fair Value Disclosure, Total | 152 |  | 161 |
Derivative liabilities | (136) | [4] | (148) | [4]
Net Assets Fair Value, Total | 16 |  | 13 |
Duke Energy Carolinas [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments in available-for-sale auction rate securities, fair value | 3 | [5] | 3 | [5]
Nuclear decommissioning trust fund equity securities | 1,734 |  | 1,592 |
Nuclear decommissioning trust fund debt securities | 785 |  | 762 |
Assets, Fair Value Disclosure, Total | 2,522 |  | 2,357 |
Derivative liabilities | (5) | [6] | (12) | [6]
Net Assets Fair Value, Total | 2,517 |  | 2,345 |
Duke Energy Carolinas [Member] | Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 1,663 |  | 1,523 |
Nuclear decommissioning trust fund debt securities | 180 |  | 155 |
Assets, Fair Value Disclosure, Total | 1,843 |  | 1,678 |
Net Assets Fair Value, Total | 1,843 |  | 1,678 |
Duke Energy Carolinas [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 50 |  | 48 |
Nuclear decommissioning trust fund debt securities | 556 |  | 559 |
Assets, Fair Value Disclosure, Total | 606 |  | 607 |
Net Assets Fair Value, Total | 606 |  | 607 |
Duke Energy Carolinas [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Investments in available-for-sale auction rate securities, fair value | 3 | [5] | 3 | [5]
Nuclear decommissioning trust fund equity securities | 21 |  | 21 |
Nuclear decommissioning trust fund debt securities | 49 |  | 48 |
Assets, Fair Value Disclosure, Total | 73 |  | 72 |
Derivative liabilities | (5) | [6] | (12) | [6]
Net Assets Fair Value, Total | 68 |  | 60 |
Progress Energy [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 1,369 |  | 1,245 |
Nuclear decommissioning trust fund debt securities | 648 |  | 643 |
Other trading and available-for sale debt securities | 60 | [7] | 57 | [7]
Derivative assets | 15 | [8] | 11 | [8]
Assets, Fair Value Disclosure, Total | 2,092 |  | 1,956 |
Derivative liabilities | (269) | [9] | (440) | [9]
Net Assets Fair Value, Total | 1,823 |  | 1,516 |
Progress Energy [Member] | Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 1,363 |  | 1,239 |
Nuclear decommissioning trust fund debt securities | 177 |  | 162 |
Other trading and available-for sale debt securities | 20 | [7] | 17 | [7]
Assets, Fair Value Disclosure, Total | 1,560 |  | 1,418 |
Net Assets Fair Value, Total | 1,560 |  | 1,418 |
Progress Energy [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 6 |  | 6 |
Nuclear decommissioning trust fund debt securities | 471 |  | 481 |
Other trading and available-for sale debt securities | 40 | [7] | 40 | [7]
Derivative assets | 15 | [8] | 11 | [8]
Assets, Fair Value Disclosure, Total | 532 |  | 538 |
Derivative liabilities | (238) | [9] | (402) | [9]
Net Assets Fair Value, Total | 294 |  | 136 |
Progress Energy [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative liabilities | (31) | [9] | (38) | [9]
Net Assets Fair Value, Total | (31) |  | (38) |
Duke Energy Progress [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 894 |  | 811 |
Nuclear decommissioning trust fund debt securities | 453 |  | 448 |
Other trading and available-for sale debt securities | 4 | [7] | 3 | [7]
Derivative assets | 5 | [8] | 2 | [8]
Assets, Fair Value Disclosure, Total | 1,356 |  | 1,264 |
Derivative liabilities | (98) | [10] | (166) | [10]
Net Assets Fair Value, Total | 1,258 |  | 1,098 |
Duke Energy Progress [Member] | Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 894 |  | 811 |
Nuclear decommissioning trust fund debt securities | 123 |  | 119 |
Other trading and available-for sale debt securities | 4 | [7] | 3 | [7]
Assets, Fair Value Disclosure, Total | 1,021 |  | 933 |
Net Assets Fair Value, Total | 1,021 |  | 933 |
Duke Energy Progress [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund debt securities | 330 |  | 329 |
Derivative assets | 5 | [8] | 2 | [8]
Assets, Fair Value Disclosure, Total | 335 |  | 331 |
Derivative liabilities | (67) | [10] | (128) | [10]
Net Assets Fair Value, Total | 268 |  | 203 |
Duke Energy Progress [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative liabilities | (31) | [10] | (38) | [10]
Net Assets Fair Value, Total | (31) |  | (38) |
Duke Energy Florida [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 474 |  | 435 |
Nuclear decommissioning trust fund debt securities | 196 |  | 194 |
Other trading and available-for sale debt securities | 45 | [11] | 43 | [11]
Derivative assets | 10 | [12] | 9 | [12]
Assets, Fair Value Disclosure, Total | 725 |  | 681 |
Derivative liabilities | (167) | [13] | (270) | [13]
Net Assets Fair Value, Total | 558 |  | 411 |
Duke Energy Florida [Member] | Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 468 |  | 429 |
Nuclear decommissioning trust fund debt securities | 54 |  | 43 |
Other trading and available-for sale debt securities | 5 | [11] | 3 | [11]
Assets, Fair Value Disclosure, Total | 527 |  | 475 |
Net Assets Fair Value, Total | 527 |  | 475 |
Duke Energy Florida [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Nuclear decommissioning trust fund equity securities | 6 |  | 6 |
Nuclear decommissioning trust fund debt securities | 142 |  | 151 |
Other trading and available-for sale debt securities | 40 | [11] | 40 | [11]
Derivative assets | 10 | [12] | 9 | [12]
Assets, Fair Value Disclosure, Total | 198 |  | 206 |
Derivative liabilities | (167) | [13] | (270) | [13]
Net Assets Fair Value, Total | 31 |  | (64) |
Duke Energy Ohio [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative assets | 19 | [14] | 59 | [14]
Derivative liabilities | (94) | [9] | (38) | [9]
Net Assets Fair Value, Total | (75) |  | 21 |
Duke Energy Ohio [Member] | Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative assets | 8 | [14] | 48 | [14]
Derivative liabilities | (72) | [9] | (15) | [9]
Net Assets Fair Value, Total | (64) |  | 33 |
Duke Energy Ohio [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative assets | 2 | [14] | 2 | [14]
Derivative liabilities | (8) | [9] | (8) | [9]
Net Assets Fair Value, Total | (6) |  | (6) |
Duke Energy Ohio [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative assets | 9 | [14] | 9 | [14]
Derivative liabilities | (14) | [9] | (15) | [9]
Net Assets Fair Value, Total | (5) |  | (6) |
Duke Energy Indiana [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale securities, equity securities, noncurrent | 54 | [1] | 49 | [1]
Available-for-sale securities, debt securities, noncurrent | 29 | [1] | 29 | [1]
Derivative assets | 5 | [15] | 10 | [15]
Assets, Fair Value Disclosure, Total | 88 |  | 88 |
Derivative liabilities | (55) | [4] | (63) | [4]
Net Assets Fair Value, Total | 33 |  | 25 |
Duke Energy Indiana [Member] | Level 1 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale securities, equity securities, noncurrent | 54 | [1] | 49 | [1]
Derivative assets | 1 | [15] |  |
Assets, Fair Value Disclosure, Total | 55 |  | 49 |
Net Assets Fair Value, Total | 55 |  | 49 |
Duke Energy Indiana [Member] | Level 2 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Available-for-sale securities, debt securities, noncurrent | 29 | [1] | 29 | [1]
Assets, Fair Value Disclosure, Total | 29 |  | 29 |
Derivative liabilities | (55) | [4] | (63) | [4]
Net Assets Fair Value, Total | (26) |  | (34) |
Duke Energy Indiana [Member] | Level 3 [Member] |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |
Derivative assets | 4 | [15] | 10 | [15]
Assets, Fair Value Disclosure, Total | 4 |  | 10 |
Net Assets Fair Value, Total | $ 4 |  | $ 10 |
[1] | Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
[2] | Included in Other within Current Assets and Other within Investments and Other Assets on the Condensed Consolidated Balance Sheet.
[3] | Included in Other within Investments and Other Assets and Short-term Investments on the Condensed Consolidated Balance Sheets.
[4] | Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheets.
[5] | Included in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
[6] | Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities on the Condensed Consolidated Balance Sheet.
[7] | Included in Other within Investments and Other Assets in the Condensed Consolidated Balance Sheets.
[8] | Included in Other Current Assets within Current Assets and Other within Investments and Other Assets in the Condensed Consolidated Balance Sheets.
[9] | Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Consolidated Balance Sheets.
[10] | Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Consolidated Balance Sheets
[11] | Included in Other within Investments and Other Assets in the Condensed Balance Sheets.
[12] | Included in Other Current Assets within Current Assets and Other within Investments and Other Assets in the Condensed Balance Sheets.
[13] | Included in Other within Current Liabilities and Other within Deferred Credits and Other Liabilities in the Condensed Balance Sheets
[14] | Included in Other within Current Assets and Other within Investments and Other Assets in the Condensed Consolidated Balance Sheets.
[15] | Included in Other within Current Assets on the Condensed Consolidated Balance Sheets.

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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 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 Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 17 -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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 16 -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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15C -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 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15E -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 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -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 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13 -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 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 15D -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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