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Stock-Based Compensation (Schedule of Stock-Based Compensation Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | $ 65 | $ 56 | $ 43
Pretax stock-based compensation cost | 89 | 78 | 68
Stock-based compensation costs capitalized | 5 | 5 | 4
Stock-based compensation expense | 84 | 73 | 64
Tax benefit associated with stock-based compensation expense | 19 | 17 | 25
RSU awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax stock-based compensation cost | 44 | 43 | 41
Performance awards |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Pretax stock-based compensation cost | 45 | 35 | 27
Duke Energy Carolinas |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 24 | 20 | 15
Progress Energy |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 24 | 21 | 16
Duke Energy Progress |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 15 | 13 | 10
Duke Energy Florida |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 9 | 8 | 6
Duke Energy Ohio |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 5 | 4 | 3
Duke Energy Indiana |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | 6 | 5 | 4
Piedmont |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total expense recognized | $ 3 | $ 3 | $ 3

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