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Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | $ 56 | $ 43 | $ 35 |
Pretax stock-based compensation cost | 78 | 68 | 55 |
Stock-based compensation costs capitalized | 5 | 4 | 2 |
Stock-based compensation expense | 73 | 64 | 53 |
Tax benefit associated with stock-based compensation expense | 17 | 25 | 20 |
Restricted Stock Units Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pretax stock-based compensation cost | 43 | 41 | 36 |
Performance Awards [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Pretax stock-based compensation cost | 35 | 27 | 19 |
Duke Energy Carolinas [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | 20 | 15 | 12 |
Progress Energy [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | 21 | 16 | 12 |
Duke Energy Progress [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | 13 | 10 | 7 |
Duke Energy Florida [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | 8 | 6 | 5 |
Duke Energy Ohio [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | 4 | 3 | 2 |
Duke Energy Indiana [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | 5 | 4 | $ 3 |
Piedmont Natural Gas [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Allocated Share-based Compensation Expense, Net of Tax | $ 3 | $ 3 |  | $ 10
Pretax stock-based compensation cost |  |  |  | 16
Tax benefit associated with stock-based compensation expense |  |  |  | $ 6

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