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Condensed Consolidated Statements of Operations (Unaudited) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Operating Revenues [Abstract]        
Regulated electric $ 5,718 $ 5,763 $ 15,441 $ 10,892
Non-regulated electric, natural gas, and other 908 882 2,683 2,708
Regulated natural gas 83 77 362 329
Total operating revenues 6,709 6,722 18,486 13,929
Operating Expenses [Abstract]        
Fuel used in electric generation and purchased power - regulated 2,013 2,222 5,394 3,848
Fuel used in electric generation and purchased power - non-regulated 428 484 1,329 1,328
Cost of natural gas and coal sold 33 40 180 184
Operation, maintenance and other 1,458 1,654 4,383 3,262
Depreciation and amortization 707 666 2,045 1,620
Property and other taxes 325 326 991 681
Impairment charges 2 266 388 668
Total operating expenses 4,966 5,658 14,710 11,591
Gains (Losses) on Sales of Other Assets and Other, net 0 14 3 21
Operating Income (Loss) 1,743 1,078 3,779 2,359
Other Income and Expenses [Abstract]        
Equity in earnings of unconsolidated affiliates 33 33 91 118
Other income and expenses, net 54 132 182 285
Total other income and expenses 87 165 273 403
Interest Expense 379 401 1,127 857
Income (Loss) From Continuing Operations Before Income Taxes 1,451 842 2,925 1,905
Income Tax Expense or Benefit from Continuing Operations 457 248 952 565
Income (Loss) from Continuing Operations 994 594 1,973 1,340
Income (Loss) From Discontinued Operations, net of tax 14 4 11 5
Net Income (Loss) 1,008 598 1,984 1,345
Less: Net Income (Loss) Attributable to Noncontrolling Interests 4 4 7 12
Net Income (Loss) Attributable to Duke Energy 1,004 594 1,977 1,333
Other Comprehensive Income(Loss), Net of Tax [Abstract]        
Pension and OPEB related adjustments   (21) [1] 5 [1] (15) [1]
Net unrealized gain (loss) on cash flow hedges 1 [2] (2) [2] 55 [2] (19) [2]
Reclassification into earnings from cash flow hedges (1) 2 (1)  
Other Comprehensive Income Unrealized Holding Gain Loss On Auction Rate Securities Arising During Period Net Of Tax   1   7
Other comprehensive income (loss), net of tax (4) (20) (78) (110)
Comprehensive Income (Loss) 1,004 578 1,906 1,235
Less: Comprehensive Income Attributable to Noncontrolling Interests 4 4 3 8
Comprehensive income (loss) 1,000 574 1,903 1,227
Income From Continuing Operations Attributable To Parent Common Shareholders [Abstract]        
Basic $ 1.40 $ 0.84 $ 2.78 $ 2.50
Diluted $ 1.40 $ 0.84 $ 2.78 $ 2.50
Income (loss) from discontinued operations attributable To Duke Energy Corporation common shareholders [Abstract]        
Basic $ 0.02 $ 0.01 $ 0.01 $ 0.01
Diluted $ 0.02 $ 0.01 $ 0.01 $ 0.01
Net income attributable to Duke Energy Corporation common shareholders [Abstract]        
Basic $ 1.42 $ 0.85 $ 2.79 $ 2.51
Diluted $ 1.42 $ 0.85 $ 2.79 $ 2.51
Dividends declared per share $ 0 $ 0 $ 2.31 $ 2.265
Weighted-average shares outstanding [Abstract]        
Basic 706 699 706 531
Diluted 706 699 706 531
Duke Energy Carolinas [Member]
        
Operating Revenues [Abstract]        
Total operating revenues 1,919 1,939 5,239 5,056
Operating Expenses [Abstract]        
Fuel used in electric generation and purchased power - regulated 539 576 1,500 1,398
Operation, maintenance and other 456 562 1,392 1,369
Depreciation and amortization 228 233 676 687
Property and other taxes 90 100 282 279
Impairment charges   31   31
Total operating expenses 1,313 1,502 3,850 3,764
Gains (Losses) on Sales of Other Assets and Other, net (2) 3 0 9
Operating Income (Loss) 604 440 1,389 1,301
Other Income and Expenses [Abstract]        
Total other income and expenses 29 48 94 130
Interest Expense 82 95 255 285
Income (Loss) From Continuing Operations Before Income Taxes 551 393 1,228 1,146
Income Tax Expense or Benefit from Continuing Operations 209 135 461 411
Net Income (Loss) 342 258 767 735
Other Comprehensive Income(Loss), Net of Tax [Abstract]        
Reclassification into earnings from cash flow hedges 1 0 1 2
Other comprehensive income (loss), net of tax     1 2
Comprehensive Income (Loss) 343 258 768 737
Progress Energy [Member]
        
Operating Revenues [Abstract]        
Total operating revenues 2,766 2,788 7,233 7,178
Operating Expenses [Abstract]        
Fuel used in electric generation and purchased power - regulated 1,154 1,396 2,932 3,299
Operation, maintenance and other 559 626 1,653 1,798
Depreciation and amortization 240 174 644 571
Property and other taxes 141 160 423 440
Impairment charges 2 55 368 55
Total operating expenses 2,096 2,411 6,020 6,163
Gains (Losses) on Sales of Other Assets and Other, net 1 2 2 4
Operating Income (Loss) 671 379 1,215 1,019
Other Income and Expenses [Abstract]        
Total other income and expenses 26 32 63 97
Interest Expense 162 182 520 560
Income (Loss) From Continuing Operations Before Income Taxes 535 229 758 556
Income Tax Expense or Benefit from Continuing Operations 207 75 289 193
Income (Loss) from Continuing Operations 328 154 469 363
Income (Loss) From Discontinued Operations, net of tax 14 3 10 10
Net Income (Loss) 342 157 479 373
Less: Net Income (Loss) Attributable to Noncontrolling Interests 1 2 2 5
Net Income (Loss) Attributable to Duke Energy 341 155 477 368
Other Comprehensive Income(Loss), Net of Tax [Abstract]        
Pension and OPEB related adjustments 4 1 5 0
Net unrealized gain (loss) on cash flow hedges (3) 0 0 (5)
Reclassification into earnings from cash flow hedges 3 0 3 7
Reclassification of cash flow hedges to regulatory assets 0 97 [3] 0 97 [3]
Other comprehensive income (loss), net of tax 4 98 8 99
Comprehensive income (loss) 346 255 487 472
Duke Energy Progress [Member]
        
Operating Revenues [Abstract]        
Total operating revenues 1,430 1,398 3,781 3,578
Operating Expenses [Abstract]        
Fuel used in electric generation and purchased power - regulated 574 597 1,470 1,450
Operation, maintenance and other 352 384 1,044 1,146
Depreciation and amortization 143 131 393 399
Property and other taxes 59 60 172 168
Impairment charges 0 55 22 55
Total operating expenses 1,128 1,227 3,101 3,218
Gains (Losses) on Sales of Other Assets and Other, net 1 1 1 2
Operating Income (Loss) 303 172 681 362
Other Income and Expenses [Abstract]        
Total other income and expenses 21 21 43 57
Interest Expense 52 52 147 156
Income (Loss) From Continuing Operations Before Income Taxes 272 141 577 263
Income Tax Expense or Benefit from Continuing Operations 97 45 215 83
Net Income (Loss) 175 96 362 180
Less: Preferred Stock Dividend Requirement 0 1 0 2
Net Income (Loss) Available to Parent 175 95 362 178
Other Comprehensive Income(Loss), Net of Tax [Abstract]        
Net unrealized gain (loss) on cash flow hedges 0 1 0 (4)
Reclassification into earnings from cash flow hedges 0 0 0 4
Reclassification of cash flow hedges to regulatory assets 0 71 [4] 0 71 [4]
Other comprehensive income (loss), net of tax 0 72 0 71
Comprehensive income (loss) 175 168 362 251
Duke Energy Florida [Member]
        
Operating Revenues [Abstract]        
Total operating revenues 1,332 1,388 3,442 3,594
Operating Expenses [Abstract]        
Fuel used in electric generation and purchased power - regulated 579 799 1,462 1,849
Operation, maintenance and other 207 245 616 660
Depreciation and amortization 95 39 237 158
Property and other taxes 81 99 245 271
Impairment charges 1 0 346 0
Total operating expenses 963 1,182 2,906 2,938
Gains (Losses) on Sales of Other Assets and Other, net 0 1 1 2
Operating Income (Loss) 369 207 537 658
Other Income and Expenses [Abstract]        
Total other income and expenses 6 11 19 29
Interest Expense 46 62 138 194
Income (Loss) From Continuing Operations Before Income Taxes 329 156 418 493
Income Tax Expense or Benefit from Continuing Operations 132 56 168 182
Net Income (Loss) 197 100 250 311
Less: Preferred Stock Dividend Requirement 0 0 0 1
Net Income (Loss) Available to Parent 197 100 250 310
Other Comprehensive Income(Loss), Net of Tax [Abstract]        
Pension and OPEB related adjustments (1) 0 (1) 0
Reclassification of cash flow hedges to regulatory assets 0 26 0 26
Other comprehensive income (loss), net of tax (1) 26 (1) 26
Comprehensive income (loss) 196 126 249 337
Duke Energy Ohio [Member]
        
Operating Revenues [Abstract]        
Regulated electric 371 387 1,043 1,047
Non-regulated electric, natural gas, and other 364 292 970 1,008
Regulated natural gas 84 78 364 331
Total operating revenues 819 757 2,377 2,386
Operating Expenses [Abstract]        
Fuel used in electric generation and purchased power - regulated 121 141 327 375
Fuel used in electric generation and purchased power - non-regulated 234 234 696 649
Cost of natural gas and coal sold 9 8 102 95
Operation, maintenance and other 187 208 584 579
Depreciation and amortization 88 86 265 249
Property and other taxes 65 38 201 166
Total operating expenses 704 715 2,175 2,113
Gains (Losses) on Sales of Other Assets and Other, net 1 0 5 2
Operating Income (Loss) 116 42 207 275
Other Income and Expenses [Abstract]        
Total other income and expenses 1 5 4 13
Interest Expense 14 21 50 70
Income (Loss) From Continuing Operations Before Income Taxes 103 26 161 218
Income Tax Expense or Benefit from Continuing Operations 44 12 65 85
Net Income (Loss) 59 14 96 133
Other Comprehensive Income(Loss), Net of Tax [Abstract]        
Pension and OPEB related adjustments 0 0 1 1
Other comprehensive income (loss), net of tax     1 1
Comprehensive income (loss) 59 14 97 134
Duke Energy Indiana [Member]
        
Operating Revenues [Abstract]        
Total operating revenues 755 718 2,179 2,091
Operating Expenses [Abstract]        
Fuel used in electric generation and purchased power - regulated 283 283 852 853
Operation, maintenance and other 176 162 489 473
Depreciation and amortization 72 100 227 292
Property and other taxes 21 23 59 61
Impairment charges 0 180 0 580
Total operating expenses 552 748 1,627 2,259
Operating Income (Loss) 203 (30) 552 (168)
Other Income and Expenses [Abstract]        
Total other income and expenses 4 24 14 66
Interest Expense 43 35 127 105
Income (Loss) From Continuing Operations Before Income Taxes 164 (41) 439 (207)
Income Tax Expense or Benefit from Continuing Operations 60 (22) 163 (98)
Net Income (Loss) 104 (19) 276 (109)
Other Comprehensive Income(Loss), Net of Tax [Abstract]        
Reclassification into earnings from cash flow hedges (1) 0 (2) (1)
Other comprehensive income (loss), net of tax     (2) (1)
Comprehensive income (loss) $ 103 $ (19) $ 274 $ (110)
[1] Net of insignificant tax expense and $2 million tax expense for the three and nine months ended September 30, 2013 and $10 million tax benefit and $7 million tax benefit for the three and nine months ended September 30, 2012.
[2] Net of $1 million tax benefit and $17 million tax expense for the three and nine months ended September 30, 2013 and $1 million tax benefit and $10 million tax benefit for the three and nine months ended September 30, 2012.
[3] Net of tax expense of $62 million in 2012.
[4] Net of $46 million tax expense in 2012.