v3.3.0.814

Investments in Debt and Equity Securities (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2015
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities | The following table presents the estimated fair value of investments in available-for-sale securities.
| September 30, 2015 |  | December 31, 2014
| Gross |  |  | Gross |  |  |  |  | Gross |  |  | Gross |  |  |
| Unrealized |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
| Holding |  |  | Holding |  |  | Fair |  |  | Holding |  |  | Holding |  |  | Fair |
(in millions) | Gains |  |  | Losses(b) |  |  | Value |  |  | Gains |  |  | Losses(b) |  |  | Value |
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 156 |  |  | $ | — |  |  | $ | — |  |  | $ | 136 |
Equity securities | 1,655 |  |  | 71 |  |  | 3,396 |  |  | 1,926 |  |  | 29 |  |  | 3,650 |
Corporate debt securities | 9 |  |  | 7 |  |  | 500 |  |  | 14 |  |  | 2 |  |  | 454 |
Municipal bonds | 4 |  |  | 2 |  |  | 207 |  |  | 5 |  |  | — |  |  | 184 |
U.S. government bonds | 23 |  |  | 1 |  |  | 1,131 |  |  | 19 |  |  | 2 |  |  | 978 |
Other debt securities | 1 |  |  | 3 |  |  | 172 |  |  | 1 |  |  | 2 |  |  | 147 |
Total NDTF(c) | $ | 1,692 |  |  | $ | 84 |  |  | $ | 5,562 |  |  | $ | 1,965 |  |  | $ | 35 |  |  | $ | 5,549 |
Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 32 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
Equity securities | 27 |  |  | 1 |  |  | 90 |  |  | 34 |  |  | — |  |  | 96 |
Corporate debt securities | 1 |  |  | 2 |  |  | 98 |  |  | 1 |  |  | 1 |  |  | 58 |
Municipal bonds | 3 |  |  | 1 |  |  | 73 |  |  | 3 |  |  | 1 |  |  | 76 |
U.S. government bonds | 1 |  |  | — |  |  | 52 |  |  | — |  |  | — |  |  | 27 |
Other debt securities | — |  |  | 1 |  |  | 69 |  |  | 1 |  |  | 1 |  |  | 80 |
Total Other Investments(a) | $ | 32 |  |  | $ | 5 |  |  | $ | 414 |  |  | $ | 39 |  |  | $ | 3 |  |  | $ | 352 |
Total Investments | $ | 1,724 |  |  | $ | 89 |  |  | $ | 5,976 |  |  | $ | 2,004 |  |  | $ | 38 |  |  | $ | 5,901 |
(a) These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
(b) | Substantially all these amounts are considered other-than-temporary impairments on investments within Investment Trusts that have been recognized immediately as a regulatory asset.
(c) | As of September 30, 2015, the estimated fair value of the NDTF includes NDTF assets acquired with the purchase of NCEMPA's ownership interest in certain generating assets. Refer to Note 2 for further information. This increase in estimated fair value compared to December 31, 2014, is partially offset due to reimbursements from the NDTF for Duke Energy Florida's costs related to ongoing decommissioning activity of the Crystal River Unit 3 Nuclear Plant.
Investments Classified by Contractual Maturity Date | The table below summarizes the maturity date for debt securities.
(in millions) | September 30, 2015 |
Due in one year or less | $ | 74 |
Due after one through five years | 781 |
Due after five through 10 years | 635 |
Due after 10 years | 812 |
Total | $ | 2,302 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Realized gains | $ | 30 |  |  | $ | 28 |  |  | $ | 160 |  |  | $ | 90 |
Realized losses | 28 |  |  | 51 |  |  | 59 |  |  | 57 |
Duke Energy Carolinas [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities | The following table presents the estimated fair value of investments in available-for-sale securities.
| September 30, 2015 |  | December 31, 2014
| Gross |  |  | Gross |  |  |  |  | Gross |  |  | Gross |  |  |
| Unrealized |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
| Holding |  |  | Holding |  |  | Fair |  |  | Holding |  |  | Holding |  |  | Fair |
(in millions) | Gains |  |  | Losses(b) |  |  | Value |  |  | Gains |  |  | Losses(b) |  |  | Value |
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 25 |  |  | $ | — |  |  | $ | — |  |  | $ | 51 |
Equity securities | 930 |  |  | 42 |  |  | 1,990 |  |  | 1,102 |  |  | 17 |  |  | 2,162 |
Corporate debt securities | 5 |  |  | 6 |  |  | 342 |  |  | 8 |  |  | 2 |  |  | 316 |
Municipal bonds | 1 |  |  | 1 |  |  | 69 |  |  | 1 |  |  | — |  |  | 62 |
U.S. government bonds | 6 |  |  | 1 |  |  | 383 |  |  | 7 |  |  | 1 |  |  | 308 |
Other debt securities | 1 |  |  | 3 |  |  | 141 |  |  | 1 |  |  | 2 |  |  | 133 |
Total NDTF | $ | 943 |  |  | $ | 53 |  |  | $ | 2,950 |  |  | $ | 1,119 |  |  | $ | 22 |  |  | $ | 3,032 |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Other debt securities | $ | — |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 3 |
Total Other Investments(a) | $ | — |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 3 |
Total Investments | $ | 943 |  |  | $ | 54 |  |  | $ | 2,953 |  |  | $ | 1,119 |  |  | $ | 23 |  |  | $ | 3,035 |
(a) | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
(b) | Substantially all these amounts represent other-than-temporary impairments on investments within Investment Trusts that have been recognized immediately as a regulatory asset.
Investments Classified by Contractual Maturity Date | The table below summarizes the maturity date for debt securities.
(in millions) | September 30, 2015 |
Due in one year or less | $ | 13 |
Due after one through five years | 209 |
Due after five through 10 years | 293 |
Due after 10 years | 423 |
Total | $ | 938 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Realized gains | $ | 25 |  |  | $ | 20 |  |  | $ | 132 |  |  | $ | 72 |
Realized losses | 24 |  |  | 48 |  |  | 47 |  |  | 50 |
Progress Energy [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities | The following table presents the estimated fair value investments in available-for-sale securities.
| September 30, 2015 |  | December 31, 2014
| Gross |  |  | Gross |  |  |  |  | Gross |  |  | Gross |  |  |
| Unrealized |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
| Holding |  |  | Holding |  |  | Fair |  |  | Holding |  |  | Holding |  |  | Fair |
(in millions) | Gains |  |  | Losses(b) |  |  | Value |  |  | Gains |  |  | Losses(b) |  |  | Value |
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 131 |  |  | $ | — |  |  | $ | — |  |  | $ | 85 |
Equity securities | 725 |  |  | 29 |  |  | 1,406 |  |  | 824 |  |  | 12 |  |  | 1,488 |
Corporate debt securities | 4 |  |  | 1 |  |  | 158 |  |  | 6 |  |  | — |  |  | 138 |
Municipal bonds | 3 |  |  | 1 |  |  | 138 |  |  | 4 |  |  | — |  |  | 122 |
U.S. government bonds | 17 |  |  | — |  |  | 748 |  |  | 12 |  |  | 1 |  |  | 670 |
Other debt securities | — |  |  | — |  |  | 31 |  |  | — |  |  | — |  |  | 14 |
Total NDTF(c) | $ | 749 |  |  | $ | 31 |  |  | $ | 2,612 |  |  | $ | 846 |  |  | $ | 13 |  |  | $ | 2,517 |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 23 |  |  | $ | — |  |  | $ | — |  |  | $ | 15 |
Municipal bonds | 3 |  |  | — |  |  | 43 |  |  | 3 |  |  | — |  |  | 43 |
Total Other Investments(a) | $ | 3 |  |  | $ | — |  |  | $ | 66 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 58 |
Total Investments | $ | 752 |  |  | $ | 31 |  |  | $ | 2,678 |  |  | $ | 849 |  |  | $ | 13 |  |  | $ | 2,575 |
(a) These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
(b) | Substantially all these amounts represent other-than-temporary impairments on investments within Investment Trusts that have been recognized immediately as a regulatory asset.
(c) | As of September 30, 2015, the estimated fair value of the NDTF includes NDTF assets acquired with the purchase of NCEMPA's ownership interest in certain generating assets. Refer to Note 2 for further information. This increase in estimated fair value compared to December 31, 2014, is partially offset due to reimbursements from the NDTF for Duke Energy Florida's costs related to ongoing decommissioning activity of the Crystal River Unit 3 Nuclear Plant.
Investments Classified by Contractual Maturity Date | The table below summarizes the maturity date for debt securities.
(in millions) | September 30, 2015 |
Due in one year or less | $ | 38 |
Due after one through five years | 476 |
Due after five through 10 years | 271 |
Due after 10 years | 333 |
Total | $ | 1,118 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Realized gains | $ | 5 |  |  | $ | 8 |  |  | $ | 26 |  |  | $ | 17 |
Realized losses | 4 |  |  | 3 |  |  | 10 |  |  | 6 |
Duke Energy Progress [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities | The following table presents the estimated fair value of investments in available-for-sale securities.
| September 30, 2015 |  | December 31, 2014
| Gross |  |  | Gross |  |  |  |  | Gross |  |  | Gross |  |  |
| Unrealized |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
| Holding |  |  | Holding |  |  | Fair |  |  | Holding |  |  | Holding |  |  | Fair |
(in millions) | Gains |  |  | Losses(b) |  |  | Value |  |  | Gains |  |  | Losses(b) |  |  | Value |
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 87 |  |  | $ | — |  |  | $ | — |  |  | $ | 50 |
Equity securities | 535 |  |  | 23 |  |  | 1,107 |  |  | 612 |  |  | 10 |  |  | 1,171 |
Corporate debt securities | 3 |  |  | 1 |  |  | 109 |  |  | 5 |  |  | — |  |  | 97 |
Municipal bonds | 3 |  |  | 1 |  |  | 136 |  |  | 4 |  |  | — |  |  | 120 |
U.S. government bonds | 12 |  |  | — |  |  | 485 |  |  | 9 |  |  | 1 |  |  | 265 |
Other debt securities | — |  |  | — |  |  | 19 |  |  | — |  |  | — |  |  | 8 |
Total NDTF (c) | $ | 553 |  |  | $ | 25 |  |  | $ | 1,943 |  |  | $ | 630 |  |  | $ | 11 |  |  | $ | 1,711 |
Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Total Other Investments(a) | $ | — |  |  | $ | — |  |  | $ | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Total Investments | $ | 553 |  |  | $ | 25 |  |  | $ | 1,944 |  |  | $ | 630 |  |  | $ | 11 |  |  | $ | 1,711 |
(a) These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
(b) | Substantially all these amounts represent other-than-temporary impairments on investments within Investment Trusts that have been recognized immediately as a regulatory asset.
(c) | As of September 30, 2015, the estimated fair value of the NDTF includes NDTF assets acquired with the purchase of NCEMPA's ownership interest in certain generating assets. Refer to Note 2 for further information.
Investments Classified by Contractual Maturity Date | The table below summarizes the maturity date for debt securities.
(in millions) | September 30, 2015 |
Due in one year or less | $ | 12 |
Due after one through five years | 278 |
Due after five through 10 years | 219 |
Due after 10 years | 240 |
Total | $ | 749 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Realized gains | $ | 4 |  |  | $ | 4 |  |  | $ | 21 |  |  | $ | 11 |
Realized losses | 3 |  |  | 2 |  |  | 8 |  |  | 4 |
Duke Energy Florida [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities | The following table presents the estimated fair value of investments in available-for-sale securities.
| September 30, 2015 |  | December 31, 2014
| Gross |  |  | Gross |  |  |  |  | Gross |  |  | Gross |  |  |
| Unrealized |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
| Holding |  |  | Holding |  |  | Fair |  |  | Holding |  |  | Holding |  |  | Fair |
(in millions) | Gains |  |  | Losses(b) |  |  | Value |  |  | Gains |  |  | Losses(b) |  |  | Value |
NDTF |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 44 |  |  | $ | — |  |  | $ | — |  |  | $ | 35 |
Equity securities | 190 |  |  | 6 |  |  | 299 |  |  | 212 |  |  | 2 |  |  | 317 |
Corporate debt securities | 1 |  |  | — |  |  | 49 |  |  | 1 |  |  | — |  |  | 41 |
Municipal bonds | — |  |  | — |  |  | 2 |  |  | — |  |  | — |  |  | 2 |
U.S. government bonds | 5 |  |  | — |  |  | 263 |  |  | 3 |  |  | — |  |  | 405 |
Other debt securities | — |  |  | — |  |  | 12 |  |  | — |  |  | — |  |  | 6 |
Total NDTF(c) | $ | 196 |  |  | $ | 6 |  |  | $ | 669 |  |  | $ | 216 |  |  | $ | 2 |  |  | $ | 806 |
Other Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | — |  |  | $ | 11 |  |  | $ | — |  |  | $ | — |  |  | $ | 1 |
Municipal bonds | 3 |  |  | — |  |  | 43 |  |  | 3 |  |  | — |  |  | 43 |
Total Other Investments(a) | $ | 3 |  |  | $ | — |  |  | $ | 54 |  |  | $ | 3 |  |  | $ | — |  |  | $ | 44 |
Total Investments | $ | 199 |  |  | $ | 6 |  |  | $ | 723 |  |  | $ | 219 |  |  | $ | 2 |  |  | $ | 850 |
(a) These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets.
(b) | Substantially all these amounts represent other-than-temporary impairments on investments within Investment Trusts that have been recognized immediately as a regulatory asset.
(c) | The estimated fair value at September 30, 2015, compared to the balance at December 31, 2014, is lower due to current year reimbursements from the NDTF for costs related to ongoing decommissioning activity of the Crystal River Unit 3 Nuclear Plant.
Investments Classified by Contractual Maturity Date | The table below summarizes the maturity date for debt securities.
(in millions) | September 30, 2015 |
Due in one year or less | $ | 26 |
Due after one through five years | 198 |
Due after five through 10 years | 52 |
Due after 10 years | 93 |
Total | $ | 369 |
Schedule of Realized Gain (Loss) | Realized gains and losses, which were determined on a specific identification basis, from sales of available-for-sale securities were as follows.
| Three Months Ended |  | Nine Months Ended
| September 30, |  | September 30,
(in millions) | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Realized gains | $ | 1 |  |  | $ | 3 |  |  | $ | 5 |  |  | $ | 5 |
Realized losses | 1 |  |  | 1 |  |  | 2 |  |  | 2 |
Duke Energy Indiana [Member] |
Schedule of Available-for-sale Securities [Line Items] |
Available-for-sale Securities | The following table presents the estimated fair value of investments in available-for-sale securities.
| September 30, 2015 |  | December 31, 2014
| Gross |  |  | Gross |  |  |  |  | Gross |  |  | Gross |  |  |
| Unrealized |  |  | Unrealized |  |  | Estimated |  |  | Unrealized |  |  | Unrealized |  |  | Estimated |
| Holding |  |  | Holding |  |  | Fair |  |  | Holding |  |  | Holding |  |  | Fair |
(in millions) | Gains |  |  | Losses(b) |  |  | Value |  |  | Gains |  |  | Losses(b) |  |  | Value |
Other Investments |  |  |  |  |  |  |  |  |  |  |
Equity securities | $ | 23 |  |  | $ | — |  |  | $ | 67 |  |  | $ | 28 |  |  | $ | — |  |  | $ | 71 |
Corporate debt securities | — |  |  | — |  |  | 3 |  |  | — |  |  | — |  |  | — |
Municipal bonds | — |  |  | 1 |  |  | 27 |  |  | — |  |  | 1 |  |  | 30 |
Total Other Investments(a) | $ | 23 |  |  | $ | 1 |  |  | $ | 97 |  |  | $ | 28 |  |  | $ | 1 |  |  | $ | 101 |
Total Investments | $ | 23 |  |  | $ | 1 |  |  | $ | 97 |  |  | $ | 28 |  |  | $ | 1 |  |  | $ | 101 |
(a) These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets.
(b) | Substantially all these amounts represent other-than-temporary impairments on investments within Investment Trusts that have been recognized immediately as a regulatory asset.
Investments Classified by Contractual Maturity Date | The table below summarizes the maturity date for debt securities.
(in millions) | September 30, 2015 |
Due in one year or less | $ | 2 |
Due after one through five years | 16 |
Due after five through 10 years | 8 |
Due after 10 years | 4 |
Total | $ | 30 |

X
- Definition Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
Name: | us-gaap_InvestmentsClassifiedByContractualMaturityDateTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the proceeds from sales of available-for-sale securities and the gross realized gains and gross realized losses that have been included in earnings as a result of those sales. + 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=27724398&loc=d3e27357-111563 + Details
Name: | us-gaap_ScheduleOfRealizedGainLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyCarolinasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=duk_ProgressEnergyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyFloridaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |