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Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | $ 61 | $ 65 | $ 56
Pretax stock-based compensation cost | 84 | 89 | 78
Stock-based compensation costs capitalized | 5 | 5 | 5
Stock-based compensation expense | 79 | 84 | 73
Tax benefit associated with stock-based compensation expense | 18 | 19 | 17
RSU awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax stock-based compensation cost | 46 | 44 | 43
Performance awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax stock-based compensation cost | 38 | 45 | 35
Duke Energy Carolinas |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 22 | 24 | 20
Progress Energy |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 23 | 24 | 21
Duke Energy Progress |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 15 | 15 | 13
Duke Energy Florida |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 9 | 9 | 8
Duke Energy Ohio |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 4 | 5 | 4
Duke Energy Indiana |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 6 | 6 | 5
Piedmont |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | $ 3 | $ 3 | $ 3

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