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Investments in Debt Securities and Equity Securities (Available-for-sale, OCI - ASU 2016-01) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | $ 2,577 |  | $ 2,577 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |
Debt securities, available-for-sale, realized gain | 47 | $ 5 | 57 | $ 10 |
Debt securities, available-for-sale, realized loss | 36 | 12 | 47 | 25 |
Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 2,425 |  | 2,425 |  | $ 2,231
Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 315 |  | 315 |  | 270
Corporate debt securities [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 30 |  | 30 |  | 4
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 13
Debt securities, available-for-sale | 571 |  | 571 |  | 566
Corporate debt securities [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 2 |  | 2 |  |
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 2
Debt securities, available-for-sale | 60 |  | 60 |  | 60
Municipal bonds [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 10 |  | 10 |  | 1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 4
Debt securities, available-for-sale | 318 |  | 318 |  | 353
Municipal bonds [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 3 |  | 3 |  | 0
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 1
Debt securities, available-for-sale | 90 |  | 90 |  | 85
US treasury and government [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 34 |  | 34 |  | 14
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 12
Debt securities, available-for-sale | 1,270 |  | 1,270 |  | 1,076
US treasury and government [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 2 |  | 2 |  | 1
Debt securities, available-for-sale | 51 |  | 51 |  | 45
Other debt obligations [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 3 |  | 3 |  |
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 2
Debt securities, available-for-sale | 152 |  | 152 |  | 148
Other debt obligations [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 1
Debt securities, available-for-sale | 65 |  | 65 |  | 58
Duke Energy Carolinas [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 1,120 |  | 1,120 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |
Debt securities, available-for-sale, realized gain | 16 | 4 | 25 | 9 |
Debt securities, available-for-sale, realized loss | 11 | 8 | 21 | 18 |
Duke Energy Carolinas [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 1,161 |  | 1,161 |  | 1,069
Duke Energy Carolinas [Member] | Corporate debt securities [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 18 |  | 18 |  | 2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 9
Debt securities, available-for-sale | 360 |  | 360 |  | 341
Duke Energy Carolinas [Member] | Municipal bonds [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 2 |  | 2 |  |
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 1
Debt securities, available-for-sale | 63 |  | 63 |  | 81
Duke Energy Carolinas [Member] | US treasury and government [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 17 |  | 17 |  | 5
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 8
Debt securities, available-for-sale | 556 |  | 556 |  | 475
Duke Energy Carolinas [Member] | Other debt obligations [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 3 |  | 3 |  |
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 2
Debt securities, available-for-sale | 141 |  | 141 |  | 143
Progress Energy [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 1,241 |  | 1,241 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |
Debt securities, available-for-sale, realized gain | 30 | 1 | 31 | 1 |
Debt securities, available-for-sale, realized loss | 25 | 4 | 26 | 7 |
Progress Energy [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 1,264 |  | 1,264 |  | 1,162
Progress Energy [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 97 |  | 97 |  | 64
Progress Energy [Member] | Corporate debt securities [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 12 |  | 12 |  | 2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 4
Debt securities, available-for-sale | 211 |  | 211 |  | 225
Progress Energy [Member] | Municipal bonds [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 8 |  | 8 |  | 1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 3
Debt securities, available-for-sale | 255 |  | 255 |  | 272
Progress Energy [Member] | Municipal bonds [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 3 |  | 3 |  |
Debt securities, available-for-sale | 50 |  | 50 |  | 47
Progress Energy [Member] | US treasury and government [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 17 |  | 17 |  | 9
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 4
Debt securities, available-for-sale | 714 |  | 714 |  | 601
Progress Energy [Member] | Other debt obligations [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 11 |  | 11 |  | 5
Duke Energy Progress [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 906 |  | 906 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |
Debt securities, available-for-sale, realized gain | 1 | 1 | 2 | 1 |
Debt securities, available-for-sale, realized loss | 1 | 3 | 2 | 5 |
Duke Energy Progress [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 948 |  | 948 |  | 906
Duke Energy Progress [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 2 |  | 2 |  | 6
Duke Energy Progress [Member] | Corporate debt securities [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 12 |  | 12 |  | 2
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 3
Debt securities, available-for-sale | 211 |  | 211 |  | 171
Duke Energy Progress [Member] | Municipal bonds [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 8 |  | 8 |  | 1
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 3
Debt securities, available-for-sale | 255 |  | 255 |  | 271
Duke Energy Progress [Member] | US treasury and government [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 16 |  | 16 |  | 6
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 3
Debt securities, available-for-sale | 429 |  | 429 |  | 415
Duke Energy Progress [Member] | Other debt obligations [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 11 |  | 11 |  | 3
Duke Energy Florida [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 335 |  | 335 |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |
Debt securities, available-for-sale, realized gain | 29 |  | 29 |  |
Debt securities, available-for-sale, realized loss | 24 | $ 1 | 24 | $ 2 |
Duke Energy Florida [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 316 |  | 316 |  | 256
Duke Energy Florida [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 52 |  | 52 |  | 48
Duke Energy Florida [Member] | Corporate debt securities [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 1
Debt securities, available-for-sale |  |  |  |  | 54
Duke Energy Florida [Member] | Municipal bonds [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale |  |  |  |  | 1
Duke Energy Florida [Member] | Municipal bonds [Member] | Other Classification [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 3 |  | 3 |  |
Debt securities, available-for-sale | 50 |  | 50 |  | 47
Duke Energy Florida [Member] | US treasury and government [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized gain, before tax | 1 |  | 1 |  | 3
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax |  |  |  |  | 1
Debt securities, available-for-sale | 285 |  | 285 |  | 186
Duke Energy Florida [Member] | Other debt obligations [Member] | Ndtf [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale |  |  |  |  | 2
Duke Energy Indiana [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 42 |  | 42 |  |
Duke Energy Indiana [Member] | Corporate debt securities [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | 7 |  | 7 |  | 8
Duke Energy Indiana [Member] | Municipal bonds [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale, accumulated gross unrealized loss, before tax | 1 |  | 1 |  | 1
Debt securities, available-for-sale | 34 |  | 34 |  | $ 33
Duke Energy Indiana [Member] | US treasury and government [Member] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain (Loss), before Tax [Abstract] |  |  |  |  |
Debt securities, available-for-sale | $ 1 |  | $ 1 |  |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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