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Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | $ 2,626 |
Derivative assets | 25 | $ 57
Total assets | 8,610 | 7,132
Derivative liabilities | (277) | (242)
Net assets (liabilities) | 8,310 | 6,890
Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 3 | 4
Total assets | 6,675 | 5,156
Derivative liabilities | (15) | (11)
Net assets (liabilities) | 6,660 | 5,145
Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 7 | 25
Total assets | 1,869 | 1,883
Derivative liabilities | (145) | (90)
Net assets (liabilities) | 1,701 | 1,793
Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 15 | 28
Total assets | 15 | 28
Derivative liabilities | (117) | (141)
Net assets (liabilities) | (102) | (113)
Not Categorized |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 51 | 65
Net assets (liabilities) | 51 | 65
NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 5,684 | 4,475
NDTF equity securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 5,633 | 4,410
NDTF equity securities | Not Categorized |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 51 | 65
NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 5,661 | 4,475
Debt securities, available-for-sale | 2,469 | 2,231
Derivative liabilities | (23) |
NDTF | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 826 | 576
NDTF | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,643 | 1,655
Derivative liabilities | (23) |
Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 122 | 99
Debt securities, available-for-sale | 310 | 270
Other Investments | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 122 | 99
Debt securities, available-for-sale | 91 | 67
Other Investments | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 219 | 203
Duke Energy Carolinas |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI |  | 2,484
Debt securities, available-for-sale | 1,172 |
Derivative assets |  | 3
Total assets | 4,347 | 3,556
Derivative liabilities | (49) | (33)
Net assets (liabilities) | 4,298 | 3,523
Duke Energy Carolinas | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI |  | 2,419
Total assets | 3,330 | 2,568
Net assets (liabilities) | 3,330 | 2,568
Duke Energy Carolinas | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets |  | 3
Total assets | 966 | 923
Derivative liabilities | (49) | (33)
Net assets (liabilities) | 917 | 890
Duke Energy Carolinas | Not Categorized |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI |  | 65
Total assets | 51 | 65
Net assets (liabilities) | 51 | 65
Duke Energy Carolinas | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 3,154 |
Duke Energy Carolinas | NDTF equity securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 3,103 |
Duke Energy Carolinas | NDTF equity securities | Not Categorized |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 51 |
Duke Energy Carolinas | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 3,154 | 2,484
Debt securities, available-for-sale | 1,193 | 1,069
Duke Energy Carolinas | NDTF | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 227 | 149
Duke Energy Carolinas | NDTF | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 966 | 920
Progress Energy |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 1,247 |
Derivative assets | 7 | 4
Total assets | 3,913 | 3,221
Derivative liabilities | (65) | (44)
Net assets (liabilities) | 3,825 | 3,177
Progress Energy | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 3,178 | 2,435
Net assets (liabilities) | 3,178 | 2,435
Progress Energy | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 7 | 4
Total assets | 735 | 786
Derivative liabilities | (65) | (44)
Net assets (liabilities) | 647 | 742
Progress Energy | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 2,530 | 1,991
Progress Energy | NDTF equity securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 2,530 | 1,991
Progress Energy | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 2,507 | 1,991
Debt securities, available-for-sale | 1,276 | 1,162
Derivative liabilities | (23) |
Progress Energy | NDTF | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 599 | 427
Progress Energy | NDTF | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 677 | 735
Derivative liabilities | (23) |
Progress Energy | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 100 | 64
Progress Energy | Other Investments | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 49 | 17
Progress Energy | Other Investments | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 51 | 47
Duke Energy Progress |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 921 |
Derivative assets |  | 4
Total assets | 3,053 | 2,504
Derivative liabilities | (49) | (27)
Net assets (liabilities) | 3,004 | 2,477
Duke Energy Progress | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 2,376 | 1,888
Net assets (liabilities) | 2,376 | 1,888
Duke Energy Progress | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets |  | 4
Total assets | 677 | 616
Derivative liabilities | (49) | (27)
Net assets (liabilities) | 628 | 589
Duke Energy Progress | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 2,077 | 1,588
Duke Energy Progress | NDTF equity securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 2,077 | 1,588
Duke Energy Progress | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 2,077 | 1,588
Debt securities, available-for-sale | 974 | 906
Duke Energy Progress | NDTF | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 297 | 294
Duke Energy Progress | NDTF | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 677 | 612
Duke Energy Progress | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 2 | 6
Duke Energy Progress | Other Investments | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 2 | 6
Duke Energy Florida |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 326 |
Derivative assets | 7 |
Total assets | 817 | 707
Derivative liabilities | (1) | (9)
Net assets (liabilities) | 793 | 698
Duke Energy Florida | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 759 | 537
Net assets (liabilities) | 759 | 537
Duke Energy Florida | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 7 |
Total assets | 58 | 170
Derivative liabilities | (1) | (9)
Net assets (liabilities) | 34 | 161
Duke Energy Florida | NDTF equity securities |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 453 | 403
Duke Energy Florida | NDTF equity securities | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 453 | 403
Duke Energy Florida | NDTF |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 430 | 403
Debt securities, available-for-sale | 302 | 256
Derivative liabilities | (23) |
Duke Energy Florida | NDTF | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 302 | 133
Duke Energy Florida | NDTF | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale |  | 123
Derivative liabilities | (23) |
Duke Energy Florida | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 55 | 48
Duke Energy Florida | Other Investments | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 4 | 1
Duke Energy Florida | Other Investments | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 51 | 47
Duke Energy Indiana |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 81 | 67
Debt securities, available-for-sale | 44 |
Derivative assets | 13 | 23
Total assets | 138 | 131
Derivative liabilities | (1) |
Net assets (liabilities) | 137 | 131
Duke Energy Indiana | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 2 | 1
Total assets | 83 | 68
Derivative liabilities | (1) |
Net assets (liabilities) | 82 | 68
Duke Energy Indiana | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Total assets | 44 | 41
Net assets (liabilities) | 44 | 41
Duke Energy Indiana | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 11 | 22
Total assets | 11 | 22
Net assets (liabilities) | 11 | 22
Duke Energy Indiana | Other Investments |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 81 | 67
Debt securities, available-for-sale | 44 | 41
Duke Energy Indiana | Other Investments | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Equity securities, FV-NI | 81 | 67
Duke Energy Indiana | Other Investments | Level 2 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Debt securities, available-for-sale | 44 | 41
Piedmont |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 1 | 3
Derivative liabilities | (117) | (141)
Net assets (liabilities) | (116) | (138)
Piedmont | Level 1 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative assets | 1 | 3
Net assets (liabilities) | 1 | 3
Piedmont | Level 3 |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Derivative liabilities | (117) | (141)
Net assets (liabilities) | $ (117) | $ (141)

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