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Quarterly Financial Data (Unaudited) (Unusual or Infrequently Occurring Items) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 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] |  |  |  |  |  |  |  |  |
Asset Impairment Charge Reversal | $ (14) | $ 25 |  |  |  |  | $ 11 |  |
Total | (14) | 25 | $ (225) | $ (106) | $ (199) | $ (341) | 11 | $ (871) |
Costs to achieve mergers, integration costs |  |  | (31) | (16) | (20) | (17) |  | (84) |
Sale of Retired Plant |  |  |  |  |  | 107 |  | 107 |
Impairment charges |  |  |  |  |  |  | 8 | (402) | $ (282)
Severance Costs |  |  | (187) |  |  |  | (16) | (187) | (15)
Impairments Charges |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Impairment charges |  |  | (60) | (93) |  | (55) |  | (208) |
Regulatory settlements |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Regulatory and Legislative Impacts |  |  |  |  | (179) | (86) |  | (265) |
Impacts of the Tax Act |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Tax Act |  |  | 53 | 3 |  | (76) |  | (20) |
Duke Energy Carolinas |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  | (103) | (3) | (181) | (23) |  | (310) |
Costs to achieve mergers, integration costs |  |  | (1) | (2) | (2) | (4) |  | (9) |
Impairment charges |  |  |  |  |  |  | (17) | (192) | 0
Severance Costs |  |  | (102) |  |  |  | (8) | (102) | (2)
Tax Act |  |  |  | (1) |  |  |  | (1) |
Duke Energy Carolinas | Regulatory settlements |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Regulatory and Legislative Impacts |  |  |  |  | (179) | (19) |  | (198) |
Progress Energy |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Asset Impairment Charge Reversal | 11 | 25 |  |  |  |  | 36 |  |
Total | 11 | 25 | (150) | (6) | (3) | (72) | 36 | (231) |
Costs to achieve mergers, integration costs |  |  | (2) | (1) | (3) | (4) |  | (10) |
Impairment charges |  |  |  |  |  |  | 24 | (87) | (156)
Severance Costs |  |  | (69) |  |  |  | (6) | (69) | (2)
Tax Act |  |  | (19) | (5) |  | (1) |  | (25) |
Progress Energy | Impairments Charges |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Impairment charges |  |  | (60) |  |  |  |  | (60) |
Progress Energy | Regulatory settlements |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Regulatory and Legislative Impacts |  |  |  |  |  | (67) |  | (67) |
Duke Energy Progress |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  | (68) | (5) | (2) | (69) |  | (144) |
Costs to achieve mergers, integration costs |  |  | (1) | (1) | (2) | (2) |  | (6) |
Impairment charges |  |  |  |  |  |  | (12) | (33) | (19)
Severance Costs |  |  | (52) |  |  |  | (3) | (52) | (1)
Tax Act |  |  | (15) | (4) |  |  |  | (19) |
Duke Energy Progress | Regulatory settlements |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Regulatory and Legislative Impacts |  |  |  |  |  | (67) |  | (67) |
Duke Energy Florida |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total | 11 | 25 | (76) | (2) | (1) | (2) | 36 | (81) |
Costs to achieve mergers, integration costs |  |  | (1) |  | (1) | (2) |  | (4) |
Impairment charges |  |  |  |  |  |  | 36 | (54) | (138)
Severance Costs |  |  | (17) |  |  |  | (3) | (17) | (1)
Tax Act |  |  | 2 | (2) |  |  |  |  |
Duke Energy Florida | Impairments Charges |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Asset Impairment Charge Reversal | $ 11 | $ 25 |  |  |  |  | 36 |  |
Impairment charges |  |  | (60) |  |  |  |  | (60) |
Duke Energy Ohio |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  | (14) |  | (5) | (110) |  | (129) |
Costs to achieve mergers, integration costs |  |  | (6) |  | (5) | (3) |  | (14) |
Sale of Retired Plant |  |  |  |  |  | (107) |  | (107) |
Impairment charges |  |  |  |  |  |  |  |  | (1)
Severance Costs |  |  | (6) |  |  |  |  | (6) |
Tax Act |  |  | (2) |  |  |  |  | (2) |
Duke Energy Indiana |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  | (7) | (2) |  |  |  | (9) |
Costs to achieve mergers, integration costs |  |  |  | (2) |  |  |  | (2) |
Impairment charges |  |  |  |  |  |  |  | (30) | (18)
Severance Costs |  |  | (7) |  |  |  | (1) | (7) | (1)
Piedmont |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Total |  |  | (24) | (11) | (9) | (6) |  | (50) |
Costs to achieve mergers, integration costs |  |  | (22) | $ (11) | $ (9) | $ (6) |  | (48) |
Impairment charges |  |  |  |  |  |  |  |  | (7)
Severance Costs |  |  | $ (2) |  |  |  | $ (1) | $ (2) | $ (9)

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