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Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | 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 Gains (Losses) on Cash Flow Hedges [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] | Duke Energy Carolinas [Member] Net Gains (Losses) on Cash Flow Hedges [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 Gains (Losses) on Cash Flow Hedges [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]
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2016 | $ 41,041 |  | $ 41,033 |  | $ 1 | $ 38,741 | $ 2,384 |  |  | $ (20) | $ (1) |  | $ (72) | $ 8 |  |  |  |  |  | $ 11,807 |  | $ 11,820 |  | $ 8,094 | $ 3,764 |  |  | $ (23) | $ 1 |  | $ (16) | $ (13) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, in shares at Dec. 31, 2016 |  |  |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (member's equity) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,772 | $ 10,781 |  | $ (9) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,358 | $ 4,900 | $ 4,899 |  | $ 1 |  |  |  |  |  |  |  | $ 4,067 |  |  |
Beginning Balance (parent) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,996 |  | $ 762 | $ 2,695 |  | $ (461) |  | $ 1,672 | $ 860 | $ 812
Net Income | 2,361 |  | 2,356 |  |  |  | 2,356 |  |  |  |  |  |  | 5 |  |  |  |  |  | 821 |  | 814 |  |  | 814 |  |  |  |  |  |  | 7 |  |  |  |  |  |  | 127 |  |  |  |  |  |  |  |  |
Net income (attributable to parent) | 2,356 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,009 | 1,009 |  |  | 814 |  |  |  |  |  |  |  |  |  |  |  |  | 547 | 368 | 368 |  |  |  | 127 |  |  |  |  | 127 | 318 | 76 |  | 76
Other comprehensive income (loss) | 13 |  | 13 |  |  |  |  |  |  | 1 | 10 |  | 2 |  |  | 1 |  |  | 1 | 12 |  | 12 |  |  |  |  |  | 4 | 3 |  | 5 |  |  | 3 |  |  | 3 |  |  |  |  |  |  |  |  |  |  |
Common stock issuances, including dividend reinvestment and employee benefits | 33 |  | 33 |  |  | 33 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (1,825) |  | (1,825) |  |  |  | (1,825) |  |  |  |  |  |  |  |  | (625) | (625) |  |  | (672) | [1] | (672) | [1] |  | (672) | [1] |  |  |  |  |  |  | (125) |  |  |  |  |  | (25) |  |  | (25) |  |  | (300) |  |  |
Distributions to noncontrolling interest in subsidiaries | (2) |  |  |  |  |  |  |  |  |  |  |  |  | (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equitization of certain notes payable to affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,047 |  | 1,047 |  | 1,047 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 21 | [2] | 21 | [2] |  |  | 21 | [2] |  |  |  |  |  |  |  | (1) | (1) |  |  | 2 |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  | 3 | 3 |  |  |  |  |  |  |  |  |  |  | (149) |  | (149)
Ending Balance at Sep. 30, 2017 | 41,642 |  | 41,631 |  | $ 1 | 38,774 | 2,936 |  |  | $ (19) | 9 |  | (70) | 11 |  |  |  |  |  | 13,017 |  | 13,023 |  | 9,143 | 3,906 |  |  | $ (19) | 4 |  | (11) | (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Sep. 30, 2017 |  |  |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (member's equity) at Sep. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11,156 | 11,164 |  | $ (8) |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,780 | 5,274 | 5,270 |  | 4 |  |  |  |  |  |  |  | 4,085 |  |  |
Ending Balance (parent) at Sep. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,098 |  | 762 | 2,670 |  | (334) |  | $ 1,599 | 860 | 739
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 |  |  |  | 700,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  |  | 100 |  |
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 | $ 41,739 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,468 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,163 |  | 762 | 2,670 |  | (269) |  | $ 1,662 | 860 | 802
Net Income | 2,190 |  | 2,202 |  |  |  | 2,202 |  |  |  |  |  |  | (12) |  |  |  |  |  | 910 |  | 904 |  |  | 904 |  |  |  |  |  |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (attributable to parent) | 2,202 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 936 | 936 |  |  | 904 |  |  |  |  |  |  |  |  |  |  |  |  | 532 | 514 | 514 |  |  |  | 121 |  |  |  |  | 121 | 317 | 81 |  | 81
Other comprehensive income (loss) | 13 |  | 13 |  |  |  |  |  | 15 |  | (5) |  | 3 |  |  | 1 |  | 1 |  | 6 |  | 6 |  |  |  |  | 5 |  | (1) |  | 2 |  |  | (1) |  |  | (1) |  |  |  |  |  |  |  |  |  |  |
Common stock issuances, including dividend reinvestment and employee benefits, shares |  |  |  |  | 13,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issuances, including dividend reinvestment and employee benefits | 955 |  | 955 |  |  | 955 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends | (1,914) |  | (1,914) |  |  |  | (1,914) |  |  |  |  |  |  |  |  | (750) | (750) |  |  | (250) |  | (250) |  |  | (250) |  |  |  |  |  |  |  | (175) | (75) | (75) |  |  |  |  |  |  |  |  |  | (175) |  |  |
Distributions to noncontrolling interest in subsidiaries | (1) |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other | 33 | [3] |  |  |  |  | 12 | [3] |  |  | (12) | [3] |  | 33 | [3] |  |  |  |  |  |  |  |  |  | 5 | [4] |  |  | (5) | [4] |  |  |  |  | 5 | [5] | (5) | [5] | $ 106 | [6] |  | 106 | [6] |  |  | $ 300 | 300 |
Ending Balance at Sep. 30, 2018 | $ 43,013 |  | $ 42,995 |  | $ 1 | $ 39,747 | $ 3,313 |  | $ 5 |  | $ (5) |  | $ (66) | $ 18 |  |  |  |  |  | $ 14,130 |  | $ 14,128 |  | $ 9,143 | $ 5,009 |  | $ (13) |  | $ (1) |  | $ (10) | $ 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Sep. 30, 2018 | 713,000,000 |  |  |  | 713,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  |  | 100 |  |
Ending Balance (member's equity) at Sep. 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,548 | $ 11,554 | $ (6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,306 | $ 6,056 | $ 6,058 |  | $ (2) |  |  |  |  |  |  |  | $ 4,263 |  |  |
Ending Balance (parent) at Sep. 30, 2018 | $ 42,995 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,128 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,390 |  | $ 762 | $ 2,776 |  | $ (148) |  | $ 2,043 | $ 1,160 | $ 883
[1] | Includes a $547 million non-cash dividend related to a legal entity restructuring.
[2] | Cumulative-effect adjustment due to implementation of a new accounting standard related to stock-based compensation and the associated income taxes.
[3] | 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. See Note 1 for more information. Amount in Noncontrolling Interests relates to tax equity financing activity in the Commercial Renewables segment.
[4] | 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. See Note 1 for more information.
[5] | 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. See Note 1 for more information.
[6] | Represents a non-cash settlement through equity of an intercompany payable from Duke Energy Ohio to its parent.

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