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Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | Preferred Stock [Member] | Common Stockholders' Equity [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Net Unrealized (Losses) Gains on Available for Sale Securities [Member] | Pension and OPEB Adjustments [Member] | Noncontrolling Interest [Member] | Duke Energy Carolinas [Member] | Duke Energy Carolinas [Member] Member's Equity [Member] | Duke Energy Carolinas [Member] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Progress Energy [Member] | Progress Energy [Member] Common Stockholders' Equity [Member] | Progress Energy [Member] Additional Paid-in Capital [Member] | Progress Energy [Member] Retained Earnings [Member] | Progress Energy [Member] Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] | Progress Energy [Member] Net Unrealized (Losses) Gains on Available for Sale Securities [Member] | Progress Energy [Member] Pension and OPEB Adjustments [Member] | Progress Energy [Member] Noncontrolling Interest [Member] | Duke Energy Progress [Member] | Duke Energy Florida [Member] | Duke Energy Florida [Member] Member's Equity [Member] | Duke Energy Florida [Member] Net Unrealized (Losses) Gains on Available for Sale Securities [Member] | Duke Energy Ohio [Member] | Duke Energy Ohio [Member] Common Stock [Member] | Duke Energy Ohio [Member] Additional Paid-in Capital [Member] | Duke Energy Ohio [Member] Retained Earnings [Member] | Duke Energy Indiana [Member] | Piedmont Natural Gas [Member] | Piedmont Natural Gas [Member] Common Stock [Member] | Piedmont Natural Gas [Member] Retained Earnings [Member] | Common Stock [Member] | Common Stock [Member] Common Stockholders' Equity [Member] | Common Stock [Member] Common Stock [Member] | Common Stock [Member] Additional Paid-in Capital [Member] | Preferred Stock [Member] | [4] | Preferred Stock [Member] Preferred Stock [Member] | Preferred Stock [Member] Common Stockholders' Equity [Member] | [4]
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Beginning Balance at Dec. 31, 2017 | $ 41,737 |  |  | $ 41,739 |  | $ 1 | $ 38,792 | $ 3,013 |  | $ (10) |  | $ 12 |  | $ (69) |  | $ (2) |  |  |  |  | $ 13,465 |  | $ 13,468 |  | $ 9,143 |  | $ 4,350 |  | $ (18) |  | $ 5 |  | $ (12) |  | $ (3) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, in shares at Dec. 31, 2017 |  |  |  |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (member's equity) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,361 | $ 11,368 | $ (7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,949 | $ 5,618 |  | $ 5,614 |  | $ 4 |  |  |  |  |  | $ 4,121 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (parent) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,163 | $ 762 | $ 2,670 | $ (269) |  | $ 1,662 | $ 860 | $ 802 |  |  |  |  |  |  |  |
Net Income | 622 |  |  | 620 |  |  |  | 620 |  |  |  |  |  |  |  | 2 |  |  |  |  | 237 |  | 235 |  |  |  | 235 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (attributable to parent) | 620 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 323 | 323 |  | 235 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 177 | 103 |  | 103 |  |  |  | (25) |  |  | (25) | 100 | 110 |  | 110 |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 11 |  |  | 11 |  |  |  |  |  | 13 |  | (3) |  | 1 |  |  |  | 1 |  | 1 | 2 |  | 2 |  |  |  |  |  | 2 |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |
Stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 47 | $ 47 |  | $ 47 |  |  |  |
Common stock dividends | (625) |  |  | (625) |  |  |  | (625) |  |  |  |  |  |  |  |  |  | (250) | (250) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest in subsidiaries | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 7 | [1] |  | 0 | [1] |  |  | 13 | [1] |  |  | (13) | [1] |  |  | 7 | [1] |  |  |  | (1) | [2] | (1) | [2] | (1) | [2] | 6 | [2] |  |  | (6) | [2] |  |  |  |  | 0 | [3] | 6 | [3] | (6) | [3] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2018 | 41,798 |  |  | 41,792 |  | $ 1 | 38,839 | 3,021 |  | 3 |  | (4) |  | (68) |  | 6 |  |  |  |  | 13,703 |  | 13,704 |  | 9,142 |  | 4,591 |  | (16) |  | (1) |  | (12) |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Mar. 31, 2018 |  |  |  |  |  | 701,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (member's equity) at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,435 | 11,441 | (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,126 | 5,721 |  | 5,723 |  | (2) |  |  |  |  |  | 4,221 |  |  |  |  |  |  |  |  |  |  |
Ending Balance (parent) at Mar. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,138 | 762 | 2,670 | (294) |  | $ 1,772 | 860 | 912 |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2018 | $ 43,834 |  | $ 0 | 43,817 |  | $ 1 | 40,795 | 3,113 |  | (14) |  | (3) |  | (75) |  | 17 |  |  |  |  | $ 14,257 |  | 14,254 |  | 9,143 |  | 5,131 |  | (12) |  | (1) |  | (7) |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, in shares at Dec. 31, 2018 | 727,000,000 |  |  |  |  | 727,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |
Beginning Balance (member's equity) at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,683 | 11,689 | (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,441 | 6,095 |  | 6,097 |  | (2) |  |  |  |  |  | 4,339 |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (parent) at Dec. 31, 2018 | $ 43,817 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,254 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,445 | 762 | 2,776 | (93) |  | $ 2,091 | 1,160 | 931 |  |  |  |  |  |  |  |
Net Income | 893 |  |  | 900 |  |  |  | 900 |  |  |  |  |  |  |  | (7) |  |  |  |  | 248 |  | 249 |  |  |  | 249 |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (attributable to parent) | 900 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 293 | 293 |  | 249 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 203 | 96 |  | 96 |  |  |  | $ 69 |  |  | 69 | 110 | $ 122 |  | 122 |  |  |  |  |  |  |  |
Other comprehensive income (loss) | (12) |  |  | (12) |  |  |  |  |  | (16) |  | 4 |  |  |  |  |  |  |  |  | 3 |  | 3 |  |  |  |  |  | 2 |  |  |  | 1 |  |  |  | 1 |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances, shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  | 40,000,000 |  |
Stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 28 | $ 28 |  | $ 28 | $ 974 | $ 974 | [4] | $ 974
Common stock dividends | (676) |  |  | (676) |  |  |  | (676) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 4 | [5] |  | (1) | [5] |  |  | 23 | [5] | (6) | [5] | $ (1) | [5] | (17) | [5] | 5 | [5] | (1) |  | (1) |  |  |  |  |  |  | 6 | [6] | (4) | [6] | 0 | [6] | (2) | [6] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Mar. 31, 2019 | $ 45,045 |  | $ 974 | $ 45,030 |  | $ 1 | $ 40,823 | $ 3,360 |  | $ (36) |  |  |  | $ (92) |  | $ 15 |  |  |  |  | $ 14,508 |  | $ 14,506 |  | $ 9,143 |  | $ 5,386 |  | $ (14) |  | $ (1) |  | $ (8) |  | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Mar. 31, 2019 | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Mar. 31, 2019 | 728,000,000 |  |  |  |  | 728,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |
Ending Balance (member's equity) at Mar. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,975 | $ 11,982 | $ (7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,644 | $ 6,192 |  | $ 6,193 |  | $ (1) |  |  |  |  |  | $ 4,449 |  |  |  |  |  |  |  |  |  |  |
Ending Balance (parent) at Mar. 31, 2019 | $ 45,030 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,506 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,514 | $ 762 | $ 2,776 | $ (24) |  | $ 2,213 | $ 1,160 | $ 1,053 |  |  |  |  |  |  |  |
[1] | Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement.
[2] | Amounts in Retained Earnings and Accumulated Other Comprehensive Loss represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement.
[3] | Amounts in Member's Equity and Accumulated Other Comprehensive Income (Loss) represent a cumulative-effect adjustment due to implementation of a new accounting standard related to Financial Instruments Classification and Measurement.
[4] | Duke Energy issued 40 million depositary shares of preferred stock in the first quarter of 2019.
[5] | Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income primarily represent impacts to accumulated other comprehensive income as a result of the adoption of Accounting Standards Update 2018-02: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.
[6] | Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income primarily represent impacts to accumulated other comprehensive income as a result of the adoption of Accounting Standards Update 2018-02: Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.

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