v2.4.0.6
Variable Interest Entities (Schedule Of Non-Consolidated VIEs) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Variable Interest Entity [Line Items]    
Investments in equity method unconsolidated affiliates $ 478 $ 483
Other Assets 2,466 2,399
Intangibles 356 372
Other Current Liabilities 2,068 2,511
Deferred Credits and Other Liabilities 26,332 26,442
Long-term Debt 39,662 [1] 39,461 [1]
Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Investments in equity method unconsolidated affiliates 293 292
Other Assets 2 11
Intangibles 102 104
Total Assets 397 407
Other Current Liabilities 1 3
Deferred Credits and Other Liabilities 16 336
Total Liabilities 17 339
Net Assets 380 68
DukeNet [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Investments in equity method unconsolidated affiliates 117 118
Total Assets 117 118
Net Assets 117 118
Renewables [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Investments in equity method unconsolidated affiliates 149 147
Total Assets 149 147
Net Assets 149 147
Other VIEs [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Investments in equity method unconsolidated affiliates 27 27
Other Assets 2 2
Intangibles 102 104
Total Assets 131 133
Other Current Liabilities 1 3
Deferred Credits and Other Liabilities 16 17
Total Liabilities 17 20
Net Assets 114 113
FPC Capital I Trust [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Other Assets   9 [2]
Total Assets   9
Deferred Credits and Other Liabilities   319 [2]
Total Liabilities   319
Net Assets   (310)
Duke Energy Carolinas [Member]
    
Variable Interest Entity [Line Items]    
Other Assets 941 934
Other Current Liabilities 409 490
Deferred Credits and Other Liabilities 10,826 10,602
Long-term Debt 8,740 [3] 8,741 [3]
Progress Energy [Member]
    
Variable Interest Entity [Line Items]    
Other Assets 531 530
Other Current Liabilities 924 1,118
Deferred Credits and Other Liabilities 9,586 9,755
Long-term Debt 14,224 14,428
Progress Energy [Member] | FPC Capital I Trust [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Other Assets   9
Deferred Credits and Other Liabilities   274
Duke Energy Progress [Member]
    
Variable Interest Entity [Line Items]    
Other Assets 269 251
Other Current Liabilities 407 517
Deferred Credits and Other Liabilities 6,572 6,451
Long-term Debt 5,336 4,840
Duke Energy Florida [Member]
    
Variable Interest Entity [Line Items]    
Other Assets 176 182
Other Current Liabilities 461 534
Deferred Credits and Other Liabilities 3,844 3,934
Long-term Debt 4,894 5,320
Duke Energy Ohio [Member]
    
Variable Interest Entity [Line Items]    
Other Assets 53 75
Intangibles 124 129
Other Current Liabilities 117 126
Deferred Credits and Other Liabilities 2,475 2,473
Long-term Debt 1,994 1,997
Duke Energy Ohio [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Accounts Receivable, Net 115 97
Intangibles 102 104
Total Assets 217 201
Net Assets 217 201
Duke Energy Indiana [Member]
    
Variable Interest Entity [Line Items]    
Other Assets 130 122
Intangibles 37 41
Other Current Liabilities 146 165
Deferred Credits and Other Liabilities 2,080 2,005
Long-term Debt 3,702 3,702
Duke Energy Indiana [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]
    
Variable Interest Entity [Line Items]    
Accounts Receivable, Net 135 116
Total Assets 135 116
Net Assets $ 135 $ 116
[1] Includes book value of Non-recourse long-term debt of variable interest entities of $1,255 million and $852 million March 31, 2013 and December 31, 2012, respectively.
[2] The entire balance of Investments and other assets and $274 million of the Deferred credits and other liabilities balance applies to Progress Energy.
[3] Includes book value of Non-recourse long-term debt of variable interest entities of $300 million at both March 31, 2013 and December 31, 2012, respectively.