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Regulatory Matters (Schedule of Regulatory Assets and Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Regulatory Assets Liabilities [Line Items]    
Regulatory assets - current $ 895 $ 737
Regulatory assets, noncurrent 9,191 11,004
Regulatory assets 10,086 11,741
Regulatory liabilities - current 316 156
Regulatory liabilities - noncurrent 5,949 5,584
Regulatory liabilities 6,265 5,740
Removal Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 5,308 4,827
Amounts To Be Refunded to Customers [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 151 290
Storm Reserve [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 145 125
Accrued Pension And Other Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 138 103
Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 177 55
Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 346 340
Accrued Pension And Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 1,723 3,306
Retired Generation Facilities [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 1,748 1,781
Debt Fair Value Adjustment [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 1,338 1,472
Asset Retirement Obligations Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 1,608 1,461
Net Regulatory Asset Related To Income Taxes [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 1,115 1,373
Hedge Cost and Other Deferrals [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 450 710
Demand Side Management And Energy Efficiency [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 371 322
Vacation Accrual [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 210 245
Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 94 162
Nuclear Deferral [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 262 142
Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 459 122
Gasification Services Agreement Buyout Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 75 95
Transmission Expansion Obligation [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 70 72
Manufactured Gas Plant Environmental Reserve [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 90 77
Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 473 401
Duke Energy Carolinas [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets - current 295 221
Regulatory assets, noncurrent 1,527 1,727
Regulatory assets 1,822 1,948
Regulatory liabilities - current 65 78
Regulatory liabilities - noncurrent 2,576 2,102
Regulatory liabilities 2,641 2,180
Duke Energy Carolinas [Member] | Removal Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 2,423 1,928
Duke Energy Carolinas [Member] | Storm Reserve [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 20  
Duke Energy Carolinas [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 45 45
Duke Energy Carolinas [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 153 207
Duke Energy Carolinas [Member] | Accrued Pension And Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 347 602
Duke Energy Carolinas [Member] | Retired Generation Facilities [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 68  
Duke Energy Carolinas [Member] | Asset Retirement Obligations Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 123 48
Duke Energy Carolinas [Member] | Net Regulatory Asset Related To Income Taxes [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 555 731
Duke Energy Carolinas [Member] | Hedge Cost and Other Deferrals [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 98 88
Duke Energy Carolinas [Member] | Demand Side Management And Energy Efficiency [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 140 107
Duke Energy Carolinas [Member] | Vacation Accrual [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 82 85
Duke Energy Carolinas [Member] | Nuclear Deferral [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 40  
Duke Energy Carolinas [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 150 27
Duke Energy Carolinas [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 219 260
Progress Energy [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets - current 353 256
Regulatory assets, noncurrent 4,155 5,292
Regulatory assets 4,508 5,548
Regulatory liabilities - current 207 28
Regulatory liabilities - noncurrent 2,292 2,469
Regulatory liabilities 2,499 2,497
Progress Energy [Member] | Removal Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 2,008 2,048
Progress Energy [Member] | Amounts To Be Refunded to Customers [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 120 259
Progress Energy [Member] | Storm Reserve [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 125 125
Progress Energy [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 132 10
Progress Energy [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 114 55
Progress Energy [Member] | Accrued Pension And Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 750 1,650
Progress Energy [Member] | Retired Generation Facilities [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 1,619 1,720
Progress Energy [Member] | Asset Retirement Obligations Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 786 713
Progress Energy [Member] | Net Regulatory Asset Related To Income Taxes [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 331 401
Progress Energy [Member] | Hedge Cost and Other Deferrals [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 318 550
Progress Energy [Member] | Demand Side Management And Energy Efficiency [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 152 121
Progress Energy [Member] | Vacation Accrual [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 55 65
Progress Energy [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 37 109
Progress Energy [Member] | Nuclear Deferral [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 222 142
Progress Energy [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 137  
Progress Energy [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 101 77
Duke Energy Progress [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets - current 127 77
Regulatory assets, noncurrent 1,384 1,845
Regulatory assets 1,511 1,922
Regulatory liabilities - current 63 10
Regulatory liabilities - noncurrent 1,673 1,538
Regulatory liabilities 1,736 1,548
Duke Energy Progress [Member] | Removal Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 1,637 1,503
Duke Energy Progress [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities   10
Duke Energy Progress [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 99 35
Duke Energy Progress [Member] | Accrued Pension And Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 269 769
Duke Energy Progress [Member] | Retired Generation Facilities [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 241 128
Duke Energy Progress [Member] | Asset Retirement Obligations Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 389 372
Duke Energy Progress [Member] | Net Regulatory Asset Related To Income Taxes [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 113 175
Duke Energy Progress [Member] | Hedge Cost and Other Deferrals [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 165 240
Duke Energy Progress [Member] | Demand Side Management And Energy Efficiency [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 140 121
Duke Energy Progress [Member] | Vacation Accrual [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 50 65
Duke Energy Progress [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 6  
Duke Energy Progress [Member] | Nuclear Deferral [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 77  
Duke Energy Progress [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 19  
Duke Energy Progress [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 42 52
Duke Energy Florida [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets - current 221 179
Regulatory assets, noncurrent 2,729 3,321
Regulatory assets 2,950 3,500
Regulatory liabilities - current 144 18
Regulatory liabilities - noncurrent 618 787
Regulatory liabilities 762 805
Duke Energy Florida [Member] | Removal Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 371 401
Duke Energy Florida [Member] | Amounts To Be Refunded to Customers [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 120 259
Duke Energy Florida [Member] | Storm Reserve [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 125 125
Duke Energy Florida [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 132  
Duke Energy Florida [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 14 20
Duke Energy Florida [Member] | Accrued Pension And Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 438 754
Duke Energy Florida [Member] | Retired Generation Facilities [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 1,378 1,592
Duke Energy Florida [Member] | Asset Retirement Obligations Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 397 341
Duke Energy Florida [Member] | Net Regulatory Asset Related To Income Taxes [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 218 226
Duke Energy Florida [Member] | Hedge Cost and Other Deferrals [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 153 310
Duke Energy Florida [Member] | Demand Side Management And Energy Efficiency [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 12  
Duke Energy Florida [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 31 109
Duke Energy Florida [Member] | Nuclear Deferral [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 145 142
Duke Energy Florida [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 118  
Duke Energy Florida [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 60 26
Duke Energy Ohio [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets - current 57 46
Regulatory assets, noncurrent 471 579
Regulatory assets 528 625
Regulatory liabilities - current 27 39
Regulatory liabilities - noncurrent 262 254
Regulatory liabilities 289 293
Duke Energy Ohio [Member] | Removal Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 241 236
Duke Energy Ohio [Member] | Accrued Pension And Other Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 21 18
Duke Energy Ohio [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 27 39
Duke Energy Ohio [Member] | Accrued Pension And Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 120 225
Duke Energy Ohio [Member] | Net Regulatory Asset Related To Income Taxes [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 72 82
Duke Energy Ohio [Member] | Hedge Cost and Other Deferrals [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 5 9
Duke Energy Ohio [Member] | Demand Side Management And Energy Efficiency [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 79 94
Duke Energy Ohio [Member] | Vacation Accrual [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 7 7
Duke Energy Ohio [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 14 1
Duke Energy Ohio [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 21 19
Duke Energy Ohio [Member] | Transmission Expansion Obligation [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 74 72
Duke Energy Ohio [Member] | Manufactured Gas Plant Environmental Reserve [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 90 77
Duke Energy Ohio [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 46 39
Duke Energy Indiana [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets - current 118 126
Regulatory assets, noncurrent 717 810
Regulatory assets 835 936
Regulatory liabilities - current 16 11
Regulatory liabilities - noncurrent 782 741
Regulatory liabilities 798 752
Duke Energy Indiana [Member] | Removal Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 645 624
Duke Energy Indiana [Member] | Amounts To Be Refunded to Customers [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 31 31
Duke Energy Indiana [Member] | Accrued Pension And Other Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 77 68
Duke Energy Indiana [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory liabilities 45 29
Duke Energy Indiana [Member] | Accrued Pension And Post Retirement [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 219 325
Duke Energy Indiana [Member] | Retired Generation Facilities [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 61 61
Duke Energy Indiana [Member] | Net Regulatory Asset Related To Income Taxes [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 157 158
Duke Energy Indiana [Member] | Hedge Cost and Other Deferrals [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 29 63
Duke Energy Indiana [Member] | Vacation Accrual [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 13 13
Duke Energy Indiana [Member] | Deferred Fuel [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 43 52
Duke Energy Indiana [Member] | Post-In-Service Carrying Costs And Deferred Operating Expense [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 151 76
Duke Energy Indiana [Member] | Gasification Services Agreement Buyout Costs [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets 75 95
Duke Energy Indiana [Member] | Other [Member]
    
Regulatory Assets Liabilities [Line Items]    
Regulatory assets $ 87 $ 93