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Investments In Debt And Equity Securities (Tables)
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3 Months Ended |
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Mar. 31, 2013
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| Schedule of Investments [Line Items] |
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| Available-For-Sale Investments |
| | | March 31, 2013 | | December 31, 2012 | | (in millions) | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | NDTF | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 91 | | $ | ― | | $ | ― | | $ | 105 | | Equity securities | | 1,380 | | | 19 | | | 3,104 | | | 1,132 | | | 19 | | | 2,837 | | Corporate debt securities | | 17 | | | 2 | | | 333 | | | 21 | | | 1 | | | 338 | | Municipal bonds | | 10 | | | 1 | | | 189 | | | 12 | | | 1 | | | 194 | | U.S. government bonds | | 20 | | | 2 | | | 666 | | | 24 | | | 1 | | | 625 | | Other debt securities | | 12 | | | 2 | | | 163 | | | 10 | | | 1 | | | 164 | | Total NDTF | $ | 1,439 | | $ | 26 | | $ | 4,546 | | $ | 1,199 | | $ | 23 | | $ | 4,263 | | Other Investments | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 21 | | $ | ― | | $ | ― | | $ | 17 | | Equity securities | | 16 | | | ― | | | 84 | | | 10 | | | ― | | | 63 | | Corporate debt securities | | 1 | | | ― | | | 347 | | | 2 | | | ― | | | 381 | | Municipal bonds | | 4 | | | 1 | | | 75 | | | 4 | | | 1 | | | 70 | | U.S. government bonds | | ― | | | ― | | | 73 | | | ― | | | ― | | | 23 | | Other debt securities | | 1 | | | ― | | | 103 | | | 1 | | | ― | | | 86 | | Auction rate securities | | ― | | | 6 | | | 28 | | | ― | | | 6 | | | 29 | | Total Other Investments(a) | $ | 22 | | $ | 7 | | $ | 731 | | $ | 17 | | $ | 7 | | $ | 669 | | Total Investments | $ | 1,461 | | $ | 33 | | $ | 5,277 | | $ | 1,216 | | $ | 30 | | $ | 4,932 | | | | | | | | | | | | | | | | | | | | | | (a) | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets. | | | | | | | | | | | | | | | | | | | | |
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| Summarizes The Maturity Date For Debt Securities |
| (in millions) | March 31, 2013 | | Due in one year or less | | $ | 328 | | Due after one through five years | | | 435 | | Due after five through 10 years | | | 398 | | Due after 10 years | | | 788 | | Total | | $ | 1,949 | | | | | | |
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| Schedule of realized gain (loss) |
| | | | Three Months Ended March 31, | | (in millions) | | 2013 | | 2012 | | Realized gains | | $ | 31 | | $ | 21 | | Realized losses | | | 7 | | | 2 | | | | | | | | | |
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Duke Energy Carolinas [Member]
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| Schedule of Investments [Line Items] |
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| Available-For-Sale Investments |
| | | March 31, 2013 | | December 31, 2012 | | (in millions) | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | NDTF | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 41 | | $ | ― | | $ | ― | | $ | 40 | | Equity securities | | 736 | | | 4 | | | 1,735 | | | 600 | | | 5 | | | 1,592 | | Corporate debt securities | | 9 | | | 2 | | | 239 | | | 11 | | | 1 | | | 250 | | Municipal bonds | | ― | | | ― | | | 21 | | | 2 | | | ― | | | 40 | | U.S. government bonds | | 8 | | | 1 | | | 345 | | | 10 | | | ― | | | 304 | | Other debt securities | | 11 | | | 2 | | | 136 | | | 9 | | | 2 | | | 135 | | Total NDTF | $ | 764 | | $ | 9 | | $ | 2,517 | | $ | 632 | | $ | 8 | | $ | 2,361 | | Other Investments | | | | | | | | | | | | | | | | | | | Auction rate securities | $ | ― | | $ | 1 | | $ | 3 | | $ | ― | | $ | 1 | | $ | 3 | | Total Other Investments(a) | $ | ― | | $ | 1 | | $ | 3 | | $ | ― | | $ | 1 | | $ | 3 | | Total Investments | $ | 764 | | $ | 10 | | $ | 2,520 | | $ | 632 | | $ | 9 | | $ | 2,364 | | | | | | | | | | | | | | | | | | | | | | (a) | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets. | | | |
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| Summarizes The Maturity Date For Debt Securities |
| (in millions) | March 31, 2013 | | Due in one year or less | | $ | 18 | | Due after one through five years | | | 173 | | Due after five through 10 years | | | 185 | | Due after 10 years | | | 365 | | Total | | $ | 741 | | | | | | |
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| Schedule of realized gain (loss) |
| | | | Three Months Ended March 31, | | (in millions) | | 2013 | | 2012 | | Realized gains | | $ | 25 | | $ | 20 | | Realized losses | | | 4 | | | 2 | | | | | | | | | |
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Progress Energy [Member]
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| Schedule of Investments [Line Items] |
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| Available-For-Sale Investments |
| | | March 31, 2013 | | December 31, 2012 | | (in millions) | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | NDTF | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 50 | | $ | ― | | $ | ― | | $ | 65 | | Equity securities | | 644 | | | 15 | | | 1,369 | | | 532 | | | 14 | | | 1,245 | | Corporate debt securities | | 8 | | | ― | | | 94 | | | 9 | | | ― | | | 89 | | Municipal bonds | | 10 | | | 1 | | | 168 | | | 11 | | | 1 | | | 154 | | U.S. government bonds | | 12 | | | 1 | | | 321 | | | 14 | | | ― | | | 321 | | Other debt securities | | 1 | | | ― | | | 27 | | | 1 | | | ― | | | 28 | | Total NDTF | $ | 675 | | $ | 17 | | $ | 2,029 | | $ | 567 | | $ | 15 | | $ | 1,902 | | Other Investments | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 21 | | $ | ― | | $ | ― | | $ | 17 | | Municipal bonds | | 3 | | | ― | | | 40 | | | 3 | | | ― | | | 40 | | Total Other Investments(a) | $ | 3 | | $ | ― | | $ | 61 | | $ | 3 | | $ | ― | | $ | 57 | | Total Investments | $ | 678 | | $ | 17 | | $ | 2,090 | | $ | 570 | | $ | 15 | | $ | 1,959 | | | | | | | | | | | | | | | | | | | | | | (a) | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets. | | | | | | | | | | | | | | | | | | | | |
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| Summarizes The Maturity Date For Debt Securities |
| (in millions) | March 31, 2013 | | Due in one year or less | | $ | 26 | | Due after one through five years | | | 145 | | Due after five through 10 years | | | 164 | | Due after 10 years | | | 315 | | Total | | $ | 650 | | | | | | |
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| Schedule of realized gain (loss) |
| | | | Three Months Ended March 31, | | (in millions) | | 2013 | | 2012 | | Realized gains | | $ | 5 | | $ | 7 | | Realized losses | | | 2 | | | 3 | | | | | | | | | |
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Duke Energy Progress [Member]
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| Schedule of Investments [Line Items] |
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| Available-For-Sale Investments |
| | | March 31, 2013 | | December 31, 2012 | | (in millions) | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | NDTF | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 39 | | $ | ― | | $ | ― | | $ | 55 | | Equity securities | | 413 | | | 11 | | | 894 | | | 337 | | | 11 | | | 811 | | Corporate debt securities | | 6 | | | ― | | | 84 | | | 8 | | | ― | | | 78 | | Municipal bonds | | 4 | | | ― | | | 95 | | | 4 | | | ― | | | 80 | | U.S. government bonds | | 11 | | | 1 | | | 233 | | | 13 | | | ― | | | 241 | | Other debt securities | | 1 | | | ― | | | 11 | | | 1 | | | ― | | | 10 | | Total NDTF | $ | 435 | | $ | 12 | | $ | 1,356 | | $ | 363 | | $ | 11 | | $ | 1,275 | | Other Investments | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 4 | | $ | ― | | $ | ― | | $ | 3 | | Total Other Investments(a) | $ | ― | | $ | ― | | $ | 4 | | $ | ― | | $ | ― | | $ | 3 | | Total Investments | $ | 435 | | $ | 12 | | $ | 1,360 | | $ | 363 | | $ | 11 | | $ | 1,278 | | | | | | | | | | | | | | | | | | | | | | (a) | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets. | | | | | | | | | | | | | | | | | | | | |
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| Summarizes The Maturity Date For Debt Securities |
| (in millions) | March 31, 2013 | | Due in one year or less | | $ | 11 | | Due after one through five years | | | 128 | | Due after five through 10 years | | | 76 | | Due after 10 years | | | 208 | | Total | | $ | 423 | | | | | | |
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| Schedule of realized gain (loss) |
| | | | Three Months Ended March 31, | | (in millions) | | 2013 | | 2012 | | Realized gains | | $ | 2 | | $ | 5 | | Realized losses | | | 1 | | | 2 | | | | | | | | | |
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Duke Energy Florida [Member]
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| Schedule of Investments [Line Items] |
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| Available-For-Sale Investments |
| | | March 31, 2013 | | December 31, 2012 | | (in millions) | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | NDTF | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 11 | | $ | ― | | $ | ― | | $ | 10 | | Equity securities | | 231 | | | 4 | | | 475 | | | 194 | | | 4 | | | 434 | | Corporate debt securities | | 2 | | | ― | | | 10 | | | 1 | | | ― | | | 11 | | Municipal bonds | | 6 | | | 1 | | | 73 | | | 7 | | | ― | | | 74 | | U.S. government bonds | | 1 | | | ― | | | 88 | | | 1 | | | ― | | | 80 | | Other debt securities | | ― | | | ― | | | 16 | | | 1 | | | ― | | | 18 | | Total NDTF | $ | 240 | | $ | 5 | | $ | 673 | | $ | 204 | | $ | 4 | | $ | 627 | | Other Investments | | | | | | | | | | | | | | | | | | | Cash and cash equivalents | $ | ― | | $ | ― | | $ | 3 | | $ | ― | | $ | ― | | $ | 1 | | Municipal bonds | | 3 | | | ― | | | 40 | | | 3 | | | ― | | | 40 | | Total Other Investments(a) | $ | 3 | | $ | ― | | $ | 43 | | $ | 3 | | $ | ― | | $ | 41 | | Total Investments | $ | 243 | | $ | 5 | | $ | 716 | | $ | 207 | | $ | 4 | | $ | 668 | | | | | | | | | | | | | | | | | | | | | | (a) | These amounts are recorded in Other within Investments and Other Assets on the Condensed Balance sheets. | | | | | | | | | | | | | | | | | | | | |
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| Summarizes The Maturity Date For Debt Securities |
| (in millions) | March 31, 2013 | | Due in one year or less | | $ | 15 | | Due after one through five years | | | 17 | | Due after five through 10 years | | | 88 | | Due after 10 years | | | 107 | | Total | | $ | 227 | | | | | | |
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| Schedule of realized gain (loss) |
| | | | Three Months Ended March 31, | | (in millions) | | 2013 | | 2012 | | Realized gains | | $ | 3 | | $ | 2 | | Realized losses | | | 1 | | | 1 | | | | | | | | | |
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Duke Energy Indiana [Member]
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| Schedule of Investments [Line Items] |
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| Available-For-Sale Investments |
| | | March 31, 2013 | | December 31, 2012 | | (in millions) | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | Gross Unrealized Holding Gains | | Gross Unrealized Holding Losses | | Estimated Fair Value | | Other Investments | | | | | | | | | | | | | | | | | | | Equity securities | $ | 14 | | $ | ― | | $ | 54 | | $ | 9 | | $ | ― | | $ | 50 | | Municipal bonds | | 1 | | | ― | | | 29 | | | 1 | | | ― | | | 28 | | Total Other Investments(a) | $ | 15 | | $ | ― | | $ | 83 | | $ | 10 | | $ | ― | | $ | 78 | | Total Investments | $ | 15 | | $ | ― | | $ | 83 | | $ | 10 | | $ | ― | | $ | 78 | | | | | | | | | | | | | | | | | | | | | | (a) | These amounts are recorded in Other within Investments and Other Assets on the Condensed Consolidated Balance Sheets. | | | | | | | | | | | | | | | | | | | | |
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| Summarizes The Maturity Date For Debt Securities |
| (in millions) | March 31, 2013 | | Due in one year or less | | $ | 1 | | Due after one through five years | | | 21 | | Due after five through 10 years | | | 4 | | Due after 10 years | | | 3 | | Total | | $ | 29 | | | | | | |
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