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Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Millions | Total | Preferred Stock | Common Stockholders' Equity | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges | Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities | Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments | Noncontrolling Interests | Duke Energy Carolinas | Duke Energy Carolinas Member's Equity | Duke Energy Carolinas Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges | Progress Energy | Progress Energy Common Stockholders' Equity | Progress Energy Additional Paid-in Capital | Progress Energy Retained Earnings | Progress Energy Accumulated Other Comprehensive (Loss) Income, Net (Losses) Gains on Cash Flow Hedges | Progress Energy Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities | Progress Energy Accumulated Other Comprehensive (Loss) Income, Pension and OPEB Adjustments | Progress Energy Noncontrolling Interests | Duke Energy Progress | Duke Energy Progress Member's Equity | Duke Energy Florida | Duke Energy Florida Member's Equity | Duke Energy Florida Accumulated Other Comprehensive (Loss) Income, Net Unrealized (Losses) Gains on Available-for-Sale-Securities | Duke Energy Ohio | Duke Energy Ohio Common Stock | Duke Energy Ohio Additional Paid-in Capital | Duke Energy Ohio Retained Earnings | Duke Energy Indiana | Duke Energy Indiana Member's Equity | Piedmont Natural Gas | Piedmont Natural Gas Common Stock | Piedmont Natural Gas Retained Earnings | Preferred stock, Series A | [2] | Preferred stock, Series A Preferred Stock | Preferred stock, Series A Common Stockholders' Equity | [2] | Preferred stock, Series B | [3] | Preferred stock, Series B Preferred Stock | Preferred stock, Series B Common Stockholders' Equity | [3] | Common Stock | Common Stock Common Stockholders' Equity | Common Stock Common Stock | Common Stock Additional Paid-in Capital
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Beginning Balance at Dec. 31, 2018 |  | $ 43,834 |  |  | $ 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,445 | $ 762 | $ 2,776 | $ (93) |  |  | $ 2,091 | $ 1,160 | $ 931 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 2,937 |  |  | 3,047 |  |  |  | 3,047 |  |  |  |  |  |  |  | (110) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (attributable to parent) |  | 3,074 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,184 |  | 1,184 |  |  | 1,098 |  |  |  |  |  |  |  |  |  |  | $ 650 | 650 | 586 | 586 |  | 190 |  |  | 190 | $ 363 | 363 | 97 |  | 97 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | 2,964 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,098 | 1,098 |  | 1,098 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | (47) | [1] |  | (47) |  |  |  |  |  | (58) |  | 10 |  | 1 |  |  |  |  |  |  |  | 8 | 8 |  |  |  | 4 |  | 2 | 2 |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 973 | $ 973 | [2] | $ 973 | $ 990 | $ 990 | [3] | $ 990 | $ 158 | $ 158 |  | $ 158
Stock issuances, in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,000,000 |  |  |  |  |  |  |  |  | 2,000,000 |
Common stock dividends |  | (2,044) |  |  | (2,044) |  |  |  | (2,044) |  |  |  |  |  |  |  |  | (275) |  | (275) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of noncontrolling interest | [4] | 408 |  |  | (455) |  |  | (465) |  |  | 10 |  |  |  |  |  | 863 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution from noncontrolling interest in subsidiaries | [5] | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest in subsidiaries |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution from parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 150 | 150 |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | (1) | [6] |  | (1) | [6] |  |  | 23 | [6] | (6) | [6] | (1) | [6] | (17) | [6] |  | (1) |  |  |  | (1) |  |  |  | 7 | [7] | (4) | [7] | (1) | (2) | [7] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 |  | 47,407 |  | $ 1,963 | 46,438 |  | $ 1 | 40,488 | 4,139 |  | (68) |  | 6 |  | (91) |  | 969 |  |  |  |  |  | 15,363 | 15,360 | 9,143 | 6,236 |  | (12) |  |  | (7) |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (member's equity) at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,591 |  | 12,598 |  | (7) |  |  |  |  |  |  |  |  |  |  |  |  | 9,091 | 6,683 | 6,683 |  |  |  |  |  |  | 4,502 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Sep. 30, 2019 |  |  |  |  |  |  | 729,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (parent) at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,635 | 762 | 2,776 | 97 |  |  | 2,338 | 1,310 | 1,028 |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Jun. 30, 2019 |  | 45,332 |  | 973 | 45,213 |  | $ 1 | 40,885 | 3,502 |  | (63) |  | 4 |  | (89) |  | 119 |  |  |  |  |  | 14,839 | 14,837 | 9,143 | 5,715 |  | (13) |  |  | (8) |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, in shares at Jun. 30, 2019 |  |  |  |  |  |  | 728,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (member's equity) at Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,276 |  | 12,283 |  | (7) |  |  |  |  |  |  |  |  |  |  |  |  | 8,813 | 6,393 | 6,394 | (1) |  |  |  |  |  | 4,546 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (parent) at Jun. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,561 | 762 | 2,776 | 23 |  |  | 2,356 | 1,310 | 1,046 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 1,308 |  |  | 1,327 |  |  |  | 1,327 |  |  |  |  |  |  |  | (19) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (attributable to parent) |  | 1,342 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 590 |  | 590 |  |  | 521 |  |  |  |  |  |  |  |  |  |  | 278 | 278 | 289 | 289 |  | 74 |  |  | 74 | 156 | 156 | (18) |  | (18) |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | 1,323 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 521 | 521 |  | 521 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | (15) | [1] |  | (15) |  |  |  |  |  | (15) |  | 2 |  | (2) |  |  |  |  |  |  |  | 2 | 2 |  |  |  | 1 |  | 1 |  |  |  |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 990 | $ 990 | [3] | $ 990 | 69 | 69 |  | 69
Stock issuances, in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  | 1,000,000 |
Common stock dividends |  | (690) |  |  | (690) |  |  |  | (690) |  |  |  |  |  |  |  |  | (275) |  | (275) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (200) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of noncontrolling interest | [4] | 408 |  |  | (455) |  |  | (465) |  |  | 10 |  |  |  |  |  | 863 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution from noncontrolling interest in subsidiaries |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | (2) |  |  | (1) |  |  | (1) |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  | 1 |  |  |  |  |  |  | (1) | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2019 |  | 47,407 |  | 1,963 | 46,438 |  | $ 1 | 40,488 | 4,139 |  | (68) |  | 6 |  | (91) |  | 969 |  |  |  |  |  | 15,363 | 15,360 | 9,143 | 6,236 |  | (12) |  |  | (7) |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (member's equity) at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,591 |  | 12,598 |  | (7) |  |  |  |  |  |  |  |  |  |  |  |  | 9,091 | 6,683 | 6,683 |  |  |  |  |  |  | 4,502 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Sep. 30, 2019 |  |  |  |  |  |  | 729,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (parent) at Sep. 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,635 | 762 | 2,776 | 97 |  |  | $ 2,338 | 1,310 | 1,028 |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Dec. 31, 2019 |  | $ 47,951 |  | 1,962 | 46,822 |  | $ 1 | 40,881 | 4,108 |  | (51) |  | 3 |  | (82) |  | 1,129 |  |  |  |  |  | $ 15,593 | 15,590 | 9,143 | 6,465 |  | (10) |  | (1) | (7) |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, in shares at Dec. 31, 2019 |  | 733,000,000 |  |  |  |  | 733,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (member's equity) at Dec. 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12,811 |  | 12,818 |  | (7) |  |  |  |  |  |  |  |  |  |  |  | 9,246 | 9,246 | 6,788 | 6,789 | (1) |  |  |  |  | 4,575 | 4,575 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (parent) at Dec. 31, 2019 |  | $ 46,822 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 15,590 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,683 | 762 | 2,776 | 145 |  |  | $ 2,443 | 1,310 | 1,133 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 1,139 |  |  | 1,347 |  |  |  | 1,347 |  |  |  |  |  |  |  | (208) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (attributable to parent) |  | 1,440 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,128 |  | 1,128 |  |  | 1,232 |  |  |  |  |  |  |  |  |  |  | 711 | 711 | 623 | 623 |  | $ 201 |  |  | 201 | 299 | 299 | 155 |  | 155 |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | 1,232 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,233 | 1,232 |  | 1,232 |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | (145) | [1] |  | (133) |  |  |  |  |  | (139) |  | 5 |  | 1 |  | (12) |  |  |  |  |  | 5 | 5 |  |  |  | 3 |  | 1 | 1 |  |  |  |  | 1 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 181 | 181 |  | 181
Stock issuances, in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |
Common stock dividends |  | (2,103) |  |  | (2,103) |  |  |  | (2,103) |  |  |  |  |  |  |  |  | (600) |  | (600) |  |  | (400) | (400) |  | (400) |  |  |  |  |  |  |  |  | (400) |  |  |  |  |  |  |  |  | (200) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution from noncontrolling interest in subsidiaries | [5] | 385 |  |  | (17) |  |  | (17) |  |  |  |  |  |  |  |  | 402 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest in subsidiaries |  | (22) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22) |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | (91) | [8] |  | (91) | [8] |  | 1 | (92) | [8] |  |  |  |  |  |  |  | (13) | [9] | (13) | [9] |  | (1) | (1) |  | (1) |  |  |  |  |  |  |  |  | (1) | (1) | (1) |  |  |  |  |  |  |  | $ (1) |  | (1) |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 |  | $ 47,295 |  | 1,962 | 46,006 |  | $ 1 | 41,046 | 3,260 |  | (190) |  | 8 |  | (81) |  | 1,289 |  |  |  |  |  | $ 16,429 | 16,426 | 9,143 | 7,296 |  | (7) |  |  | (6) |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (member's equity) at Sep. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,326 |  | 13,333 |  | (7) |  |  |  |  |  |  |  |  |  |  |  | 9,556 | 9,556 | 7,411 | 7,411 |  |  |  |  |  | 4,674 | 4,674 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Sep. 30, 2020 |  | 736,000,000 |  |  |  |  | 736,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (parent) at Sep. 30, 2020 |  | $ 46,006 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,426 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,884 | 762 | 2,776 | 346 |  |  | $ 2,597 | 1,310 | 1,287 |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance at Jun. 30, 2020 |  | 46,611 |  | 1,962 | 45,484 |  | $ 1 | 40,997 | 2,707 |  | (111) |  | 10 |  | (82) |  | 1,127 |  |  |  |  |  | 16,221 | 16,218 | 9,143 | 7,090 |  | (8) |  | (1) | (6) |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance, in shares at Jun. 30, 2020 |  |  |  |  |  |  | 735,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (member's equity) at Jun. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,072 |  | 13,079 |  | (7) |  |  |  |  |  |  |  |  |  |  |  |  | 9,610 | 7,124 | 7,125 | (1) |  |  |  |  |  | 4,655 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beginning Balance (parent) at Jun. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,814 | 762 | 2,776 | 276 |  |  | 2,622 | 1,310 | 1,312 |  |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | 1,195 |  |  | 1,265 |  |  |  | 1,265 |  |  |  |  |  |  |  | (70) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income (loss) (attributable to parent) |  | 1,304 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 555 |  | 555 |  |  | 605 |  |  |  |  |  |  |  |  |  |  | 346 | 346 | 287 | 287 |  | $ 70 |  |  | 70 | 119 | 119 | $ (25) |  | (25) |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | 1,234 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 606 | 605 |  | 605 |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) |  | (80) | [1] |  | (80) |  |  |  |  |  | (79) |  | (2) |  | 1 |  |  |  |  |  |  |  | 2 | 2 |  |  |  | 1 |  | $ 1 |  |  |  |  |  | 1 |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issuances |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65 | $ 65 |  | $ 65
Stock issuances, in shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |
Common stock dividends |  | (712) |  |  | (712) |  |  |  | (712) |  |  |  |  |  |  |  |  | (300) |  | (300) |  |  | (400) | (400) |  | (400) |  |  |  |  |  |  |  |  | (400) |  |  |  |  |  |  |  |  | (100) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contribution from noncontrolling interest in subsidiaries | [5] | 222 |  |  | (17) |  |  | (17) |  |  |  |  |  |  |  |  | 239 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions to noncontrolling interest in subsidiaries |  | (8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other |  | 2 |  |  | 1 |  |  | 1 |  |  |  |  |  |  |  |  | 1 | (1) |  | (1) |  |  |  | 1 |  | 1 |  |  |  |  |  |  | (1) |  |  | (1) | (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance at Sep. 30, 2020 |  | $ 47,295 |  | $ 1,962 | $ 46,006 |  | $ 1 | $ 41,046 | $ 3,260 |  | $ (190) |  | $ 8 |  | $ (81) |  | $ 1,289 |  |  |  |  |  | $ 16,429 | $ 16,426 | $ 9,143 | $ 7,296 |  | $ (7) |  |  | $ (6) |  | $ 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (member's equity) at Sep. 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,326 |  | $ 13,333 |  | $ (7) |  |  |  |  |  |  |  |  |  |  |  | $ 9,556 | $ 9,556 | $ 7,411 | $ 7,411 |  |  |  |  |  | $ 4,674 | $ 4,674 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance, in shares at Sep. 30, 2020 |  | 736,000,000 |  |  |  |  | 736,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90,000,000 |  |  |  |  |  | 100 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ending Balance (parent) at Sep. 30, 2020 |  | $ 46,006 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 16,426 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,884 | $ 762 | $ 2,776 | $ 346 |  |  | $ 2,597 | $ 1,310 | $ 1,287 |  |  |  |  |  |  |  |  |  |  |  |
[1] | Net of income tax impacts of approximately $24 million for the three months ended September 30, 2020, and $43 million and $14 million for the nine months ended September 30, 2020, and 2019, respectively. All other periods presented include immaterial income tax impacts.
[2] | Duke Energy issued 40 million depositary shares of preferred stock, Series A.
[3] | Duke Energy issued 1 million shares of preferred stock, series B, in the third quarter of 2019.
[4] | See Note 2 for additional discussion of the transaction.
[5] | Relates to tax equity financing activity in the Commercial Renewables segment.
[6] | Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.
[7] | Amounts in Retained Earnings and Accumulated Other Comprehensive (Loss) Income primarily represent impacts to accumulated other comprehensive income due to implementation of a new accounting standard related to Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income.
[8] | Amounts in Retained earnings primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.
[9] | Amounts primarily represent impacts due to implementation of a new accounting standard related to Current Estimated Credit Losses. See Note 1 for additional discussion.

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