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Quarterly Financial Data (Unaudited) (Schedule of Quarterly Financial Information) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 6,103 | $ 6,940 | $ 5,873 | $ 6,163 | $ 6,115 | $ 6,628 | $ 5,643 | $ 6,135 | $ 25,079 | $ 24,521 | $ 23,565
Operating income (loss) | 1,109 | 1,929 | 1,298 | 1,373 | 871 | 1,579 | 979 | 1,256 | 5,709 | 4,685 | 5,625
Income (loss) from continuing operations | 614 | 1,323 | 748 | 893 | 434 | 1,062 | 507 | 622 | 3,578 | 2,625 | 3,070
(Loss) Income from discontinued operations, net of tax | (7) |  |  |  | 20 | 4 | (5) | 0 | (7) | 19 | (6)
Net income (loss) | 607 | 1,323 | 748 | 893 | 454 | 1,066 | 502 | 622 | 3,571 | 2,644 | 3,064
Net income (loss) attributable to parent |  |  |  |  | $ (464) | $ (1,082) | $ (500) | $ (620) | (3,748) | (2,666) | (3,059)
Net Income (Loss) Available to Common Stockholders, Basic | $ 660 | $ 1,327 | $ 820 | $ 900 |  |  |  |  | $ 3,707 | $ 2,666 | $ 3,059
Income (loss) from continuing operations attributable to Duke Energy Corporation common shareholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in usd per share) | $ 0.89 | $ 1.82 | $ 1.12 | $ 1.24 | $ 0.62 | $ 1.51 | $ 0.72 | $ 0.88 | $ 5.07 | $ 3.73 | $ 4.37
Income (loss) from discontinued operations attributable to Duke Energy Corporation common shareholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in usd per share) | (0.01) |  | 0 | 0 | 0.03 | 0 | (0.01) | 0 | (0.01) | 0.03 | (0.01)
Net income available to Duke Energy Corporation common stockholders |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in usd per share) | $ 0.88 | $ 1.82 | $ 1.12 | $ 1.24 | $ 0.65 | $ 1.51 | $ 0.71 | $ 0.88 | $ 5.06 | $ 3.76 | $ 4.36
Duke Energy Carolinas |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | $ 1,776 | $ 2,162 | $ 1,713 | $ 1,744 | $ 1,775 | $ 2,090 | $ 1,672 | $ 1,763 | $ 7,395 | $ 7,300 | $ 7,302
Operating income (loss) | 347 | 793 | 451 | 435 | 241 | 713 | 224 | 482 | 2,026 | 1,660 | 2,089
Net income (loss) attributable to parent | (219) | (590) | (301) | (293) | (135) | (496) | (117) | (323) | (1,403) | (1,071) | (1,214)
Progress Energy |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 2,644 | 3,242 | 2,744 | 2,572 | 2,609 | 3,045 | 2,498 | 2,576 | 11,202 | 10,728 | 9,783
Operating income (loss) | 447 | 786 | 580 | 488 | 334 | 663 | 484 | 447 | 2,301 | 1,928 | 2,147
Net income (loss) | 229 | 521 | 329 | 248 | 123 | 406 | 267 | 237 | 1,327 | 1,033 | 1,268
Net income (loss) attributable to parent | (229) | (521) | (328) | (249) | (123) | (404) | (265) | (235) | (1,327) | (1,027) | (1,258)
Duke Energy Progress |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 1,398 | 1,688 | 1,387 | 1,484 | 1,366 | 1,582 | 1,291 | 1,460 | 5,957 | 5,699 | 5,129
Operating income (loss) | 236 | 373 | 259 | 300 | 227 | 330 | 233 | 269 | 1,168 | 1,059 | 1,185
Net income (loss) attributable to parent | (155) | (278) | (169) | (203) | (135) | (216) | (139) | (177) | (805) | (667) | (715)
Duke Energy Florida |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 1,244 | 1,548 | 1,353 | 1,086 | 1,241 | 1,462 | 1,203 | 1,115 | 5,231 | 5,021 | 4,646
Operating income (loss) | 205 | 413 | 321 | 188 | 107 | 331 | 245 | 173 | 1,127 | 856 | 941
Net income (loss) attributable to parent | (106) | (289) | (201) | (96) | (40) | (243) | (168) | (103) | (692) | (554) | (712)
Duke Energy Ohio |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 487 | 489 | 433 | 531 | 505 | 469 | 459 | 524 | 1,940 | 1,957 | 1,923
Operating income (loss) | 78 | 108 | 74 | 104 | 93 | 139 | 77 | (21) | 364 | 288 | 320
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 239 | 176 | 193
(Loss) Income from discontinued operations, net of tax |  |  |  |  |  |  |  |  | (1) |  | (1)
Net income (loss) attributable to parent | (48) | (74) | (47) | (69) | (55) | (100) | (46) | 25 | (238) | (176) | (192)
Duke Energy Indiana |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 715 | 807 | 714 | 768 | 771 | 819 | 738 | 731 | 3,004 | 3,059 | 3,047
Operating income (loss) | 133 | 235 | 148 | 169 | 133 | 173 | 169 | 168 | 685 | 643 | 786
Net income (loss) attributable to parent | (73) | (156) | (97) | (110) | (76) | (119) | (98) | (100) | (436) | (393) | (354)
Piedmont |  |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating revenues | 425 | 168 | 209 | 579 | 435 | 172 | 215 | 553 | 1,381 | 1,375 | 1,328
Operating income (loss) | 139 | (13) | 6 | 172 | 79 | (19) | 5 | 161 | 304 | 226 | 297
Net income (loss) attributable to parent | $ (105) | $ 18 | $ 7 | $ (122) | $ (48) | $ 21 | $ 8 | $ (110) | $ (202) | $ (129) | $ (139)

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