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Business Segments (Business Segment Data) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues $ 23,868 $ 25,079 $ 24,521  
Interest expense 2,162 2,204 2,094  
Depreciation and amortization 4,705 4,548 4,074  
Equity in (losses) earnings of unconsolidated affiliates (2,005) 162 83  
Income tax expense (benefit) from continuing operations (236) 519 448  
Segment income (loss) 1,263 3,714 2,647  
Add back noncontrolling interests component 295 177 22  
Add back preferred stock dividend 107 41    
Loss from discontinued operations, net of tax 7 (7) 19  
Net income (loss) 1,377 3,748 2,666  
Capital expenditures 10,421 11,446 9,668  
Segment assets 162,388 158,838 145,392  
Segment Reporting Information Assets [Abstract]        
After-tax severance charges (85) 16 187  
Duke Energy Ohio        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 1,858 1,940 1,957  
Interest expense 102 109 92  
Depreciation and amortization 278 265 268  
Income tax expense (benefit) from continuing operations 43 40 43  
Segment income (loss) 252 239 176  
Loss from discontinued operations, net of tax   (1)    
Net income (loss) 252 238 176  
Capital expenditures 834 952 827  
Segment assets 10,025 9,338 8,555  
Segment Reporting Information Assets [Abstract]        
After-tax severance charges     6  
Eliminations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues (199) (200) (199)  
Interest expense (16) (58) (45)  
Depreciation and amortization (29) (5) (1)  
Segment assets   188 188  
Eliminations | Duke Energy Ohio        
Segment Reporting Information, Profit (Loss) [Abstract]        
Segment assets (2)      
Electric Utilities and Infrastructure        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 21,687 22,798 22,242  
Equity in (losses) earnings of unconsolidated affiliates (1) 9 6  
Segment Reporting Information Assets [Abstract]        
After tax impairment charge 948      
Reduction of prior year impairment 152      
Tax Act       $ 24
Shareholder Contribution expense 16      
Electric Utilities and Infrastructure | After-tax impairment charge        
Segment Reporting Information Assets [Abstract]        
After tax impairment charge     46  
Electric Utilities and Infrastructure | Regulatory settlements        
Segment Reporting Information Assets [Abstract]        
Regulatory settlement charges     202  
Electric Utilities and Infrastructure | Clemson University Combined Heat and Power Plant        
Segment Reporting Information Assets [Abstract]        
After tax impairment charge 19      
Electric Utilities and Infrastructure | Gas Pipeline Assets        
Segment Reporting Information Assets [Abstract]        
After tax impairment charge 5      
Electric Utilities and Infrastructure | Operating Segments        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 21,720 22,831 22,273  
Interest expense 1,320 1,345 1,288  
Depreciation and amortization 4,068 3,951 3,523  
Equity in (losses) earnings of unconsolidated affiliates (1) 9 5  
Income tax expense (benefit) from continuing operations 340 785 799  
Segment income (loss) 2,669 3,536 3,058  
Capital expenditures 7,629 8,263 8,086  
Segment assets 138,225 135,561 125,364  
Segment Reporting Information Assets [Abstract]        
Reduction of prior year impairment   27    
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 1,405 1,456 1,450  
Interest expense 85 80 67  
Depreciation and amortization 200 182 183  
Income tax expense (benefit) from continuing operations 19 20 47  
Segment income (loss) 162 159 186  
Capital expenditures 548 680 655  
Segment assets 6,615 6,188 5,643  
Electric Utilities and Infrastructure | Eliminations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 33 33 31  
Gas Utilities and Infrastructure        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 1,653 1,770 1,783  
Equity in (losses) earnings of unconsolidated affiliates (2,017) 114 27  
Segment Reporting Information Assets [Abstract]        
After tax impairment charge 7      
Tax Act       1
Gas Utilities and Infrastructure | After-tax impairment charge        
Segment Reporting Information, Profit (Loss) [Abstract]        
Equity in (losses) earnings of unconsolidated affiliates 2,100      
Segment Reporting Information Assets [Abstract]        
After tax impairment charge   19 42  
Gas Utilities and Infrastructure | Operating Segments        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 1,748 1,866 1,881  
Interest expense 135 117 106  
Depreciation and amortization 258 256 245  
Equity in (losses) earnings of unconsolidated affiliates (2,017) 114 27  
Income tax expense (benefit) from continuing operations (349) 22 78  
Segment income (loss) (1,266) 432 274  
Capital expenditures 1,309 1,539 1,133  
Segment assets 13,849 13,921 12,361  
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 453 484 506  
Interest expense 17 29 24  
Depreciation and amortization 78 83 85  
Income tax expense (benefit) from continuing operations 26 21 24  
Segment income (loss) 96 85 93  
Capital expenditures 286 272 172  
Segment assets 3,380 3,116 2,874  
Gas Utilities and Infrastructure | Eliminations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 95 96 98  
Commercial Renewables        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 502 487 477  
Equity in (losses) earnings of unconsolidated affiliates   (4) (1)  
Segment Reporting Information Assets [Abstract]        
Tax Act       3
Commercial Renewables | Noncontrolling Interests        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues     91  
Segment Reporting Information Assets [Abstract]        
After tax impairment charge     2  
Commercial Renewables | Operating Segments        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 502 487 477  
Interest expense 66 95 88  
Depreciation and amortization 199 168 155  
Equity in (losses) earnings of unconsolidated affiliates   (4) (1)  
Income tax expense (benefit) from continuing operations (65) (115) (147)  
Segment income (loss) 286 198 9  
Capital expenditures 1,219 1,423 193  
Segment assets 6,716 6,020 4,204  
Total Reportable Segments        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 23,842 25,055 24,502  
Total Reportable Segments | Operating Segments        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 23,970 25,184 24,631  
Interest expense 1,521 1,557 1,482  
Depreciation and amortization 4,525 4,375 3,923  
Equity in (losses) earnings of unconsolidated affiliates (2,018) 119 31  
Income tax expense (benefit) from continuing operations (74) 692 730  
Segment income (loss) 1,689 4,166 3,341  
Capital expenditures 10,157 11,225 9,412  
Segment assets 158,790 155,502 141,929  
Total Reportable Segments | Operating Segments | Duke Energy Ohio        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 1,858 1,940 1,956  
Interest expense 102 109 91  
Depreciation and amortization 278 265 268  
Income tax expense (benefit) from continuing operations 45 41 71  
Segment income (loss) 258 244 279  
Capital expenditures 834 952 827  
Segment assets 9,995 9,304 8,517  
Total Reportable Segments | Eliminations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 128 129 129  
Other        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 26 24 19  
Segment Reporting Information Assets [Abstract]        
Tax Act       $ 2
Costs to achieve mergers, acquisition costs     65  
Other | Other        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 97 95 89  
Interest expense 657 705 657  
Depreciation and amortization 209 178 152  
Equity in (losses) earnings of unconsolidated affiliates 13 43 52  
Income tax expense (benefit) from continuing operations (162) (173) (282)  
Segment income (loss) (426) (452) (694)  
Capital expenditures 264 221 256  
Segment assets 3,598 3,148 3,275  
Other | Other | Duke Energy Ohio        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues     1  
Interest expense     1  
Income tax expense (benefit) from continuing operations (2) (1) (28)  
Segment income (loss) (6) (5) (103)  
Segment assets 32 34 38  
Other | Eliminations        
Segment Reporting Information, Profit (Loss) [Abstract]        
Revenues 71 71 70  
Other        
Segment Reporting Information, Profit (Loss) [Abstract]        
Equity in (losses) earnings of unconsolidated affiliates 13 $ 43 51  
Segment Reporting Information Assets [Abstract]        
After-tax severance charges     144  
Loss in disposal     $ 82  
Severance Charge Reversal $ 98