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Investments in Debt and Equity Securities (Available-For-Sale Investments) (Details) (USD $)
In Millions, unless otherwise specified
 6 Months Ended 12 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains $ 2,085 $ 1,884
Gross Unrealized Holding Losses 28 47
Estimated Fair Value 5,806 5,551
Ndtf [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 2,044 1,852
Gross Unrealized Holding Losses 21 36
Estimated Fair Value 5,421 5,133
Ndtf [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 70 110
Ndtf [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 2,007 1,813
Gross Unrealized Holding Losses 14 10
Estimated Fair Value 3,873 3,579
Ndtf [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 17 8
Gross Unrealized Holding Losses 2 6
Estimated Fair Value 492 400
Ndtf [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 5 2
Gross Unrealized Holding Losses 1 6
Estimated Fair Value 144 160
Ndtf [Member] | US Treasury and Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 14 7
Gross Unrealized Holding Losses 3 12
Estimated Fair Value 700 730
Ndtf [Member] | Other Debt Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1 22
Gross Unrealized Holding Losses 1 2
Estimated Fair Value 142 154
Other Classification [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 41 [1] 32 [1]
Gross Unrealized Holding Losses 7 [1] 11 [1]
Estimated Fair Value 385 [1] 418 [1]
Other Classification [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 17 21
Other Classification [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 34 29
Gross Unrealized Holding Losses      
Estimated Fair Value 97 91
Other Classification [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 2 1
Gross Unrealized Holding Losses    1
Estimated Fair Value 66 99
Other Classification [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 4 2
Gross Unrealized Holding Losses 1 2
Estimated Fair Value 82 79
Other Classification [Member] | US Treasury and Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 13 17
Other Classification [Member] | Other Debt Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1   
Gross Unrealized Holding Losses 6 8
Estimated Fair Value 110 111
Duke Energy Carolinas [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1,101 1,004
Gross Unrealized Holding Losses 13 23
Estimated Fair Value 3,002 2,837
Duke Energy Carolinas [Member] | Ndtf [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1,101 1,004
Gross Unrealized Holding Losses 12 22
Estimated Fair Value 2,999 2,834
Duke Energy Carolinas [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 33 42
Duke Energy Carolinas [Member] | Ndtf [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1,085 974
Gross Unrealized Holding Losses 8 6
Estimated Fair Value 2,156 1,964
Duke Energy Carolinas [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 10 5
Gross Unrealized Holding Losses 2 5
Estimated Fair Value 343 274
Duke Energy Carolinas [Member] | Ndtf [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1   
Gross Unrealized Holding Losses    2
Estimated Fair Value 36 54
Duke Energy Carolinas [Member] | Ndtf [Member] | US Treasury and Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 5 3
Gross Unrealized Holding Losses 1 7
Estimated Fair Value 306 354
Duke Energy Carolinas [Member] | Ndtf [Member] | Other Debt Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains    22
Gross Unrealized Holding Losses 1 2
Estimated Fair Value 125 146
Duke Energy Carolinas [Member] | Other Classification [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains       [1]
Gross Unrealized Holding Losses 1 [1] 1 [1]
Estimated Fair Value 3 [1] 3 [1]
Duke Energy Carolinas [Member] | Other Classification [Member] | Other Debt Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses 1 1
Estimated Fair Value 3 3
Progress Energy [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 946 849
Gross Unrealized Holding Losses 9 14
Estimated Fair Value 2,480 2,358
Progress Energy [Member] | Ndtf [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 943 848
Gross Unrealized Holding Losses 9 14
Estimated Fair Value 2,422 2,299
Progress Energy [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 37 68
Progress Energy [Member] | Ndtf [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 922 839
Gross Unrealized Holding Losses 6 4
Estimated Fair Value 1,717 1,615
Progress Energy [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 7 3
Gross Unrealized Holding Losses    1
Estimated Fair Value 149 126
Progress Energy [Member] | Ndtf [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 4 2
Gross Unrealized Holding Losses 1 4
Estimated Fair Value 108 106
Progress Energy [Member] | Ndtf [Member] | US Treasury and Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 9 4
Gross Unrealized Holding Losses 2 5
Estimated Fair Value 394 376
Progress Energy [Member] | Ndtf [Member] | Other Debt Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1   
Gross Unrealized Holding Losses      
Estimated Fair Value 17 8
Progress Energy [Member] | Other Classification [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 3 [1] 1 [1]
Gross Unrealized Holding Losses 0 [1] 0 [1]
Estimated Fair Value 58 [1] 59 [1]
Progress Energy [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 17 20
Progress Energy [Member] | Other Classification [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 3 1
Gross Unrealized Holding Losses      
Estimated Fair Value 41 39
Duke Energy Progress [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 607 544
Gross Unrealized Holding Losses 7 11
Estimated Fair Value 1,634 1,540
Duke Energy Progress [Member] | Ndtf [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 607 544
Gross Unrealized Holding Losses 7 11
Estimated Fair Value 1,632 1,538
Duke Energy Progress [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 27 48
Duke Energy Progress [Member] | Ndtf [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 590 535
Gross Unrealized Holding Losses 4 3
Estimated Fair Value 1,139 1,069
Duke Energy Progress [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 5 3
Gross Unrealized Holding Losses    1
Estimated Fair Value 94 80
Duke Energy Progress [Member] | Ndtf [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 4 2
Gross Unrealized Holding Losses 1 4
Estimated Fair Value 106 104
Duke Energy Progress [Member] | Ndtf [Member] | US Treasury and Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 7 4
Gross Unrealized Holding Losses 2 3
Estimated Fair Value 256 232
Duke Energy Progress [Member] | Ndtf [Member] | Other Debt Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 1   
Gross Unrealized Holding Losses      
Estimated Fair Value 10 5
Duke Energy Progress [Member] | Other Classification [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 0 [1] 0 [1]
Gross Unrealized Holding Losses 0 [1] 0 [1]
Estimated Fair Value 2 [1] 2 [1]
Duke Energy Progress [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 2 2
Duke Energy Florida [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 339 305
Gross Unrealized Holding Losses 2 3
Estimated Fair Value 833 803
Duke Energy Florida [Member] | Ndtf [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 336 304
Gross Unrealized Holding Losses 2 3
Estimated Fair Value 790 761
Duke Energy Florida [Member] | Ndtf [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 10 20
Duke Energy Florida [Member] | Ndtf [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 332 304
Gross Unrealized Holding Losses 2 1
Estimated Fair Value 578 546
Duke Energy Florida [Member] | Ndtf [Member] | Corporate Debt Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 2   
Gross Unrealized Holding Losses      
Estimated Fair Value 55 46
Duke Energy Florida [Member] | Ndtf [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 2 2
Duke Energy Florida [Member] | Ndtf [Member] | US Treasury and Government [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 2   
Gross Unrealized Holding Losses    2
Estimated Fair Value 138 144
Duke Energy Florida [Member] | Ndtf [Member] | Other Debt Obligations [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 7 3
Duke Energy Florida [Member] | Other Classification [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 3 [1] 1 [1]
Gross Unrealized Holding Losses 0 [1] 0 [1]
Estimated Fair Value 43 [1] 42 [1]
Duke Energy Florida [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 2 3
Duke Energy Florida [Member] | Other Classification [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 3 1
Gross Unrealized Holding Losses      
Estimated Fair Value 41 39
Duke Energy Indiana [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 27 24
Gross Unrealized Holding Losses 1 1
Estimated Fair Value 100 94
Duke Energy Indiana [Member] | Other Classification [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 27 [1] 24 [1]
Gross Unrealized Holding Losses 1 [1] 1 [1]
Estimated Fair Value 100 [1] 94 [1]
Duke Energy Indiana [Member] | Other Classification [Member] | Cash and Cash Equivalents [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses      
Estimated Fair Value 1 1
Duke Energy Indiana [Member] | Other Classification [Member] | Equity Securities [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains 27 24
Gross Unrealized Holding Losses      
Estimated Fair Value 69 65
Duke Energy Indiana [Member] | Other Classification [Member] | Municipal Bonds [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Gross Unrealized Holding Gains      
Gross Unrealized Holding Losses 1 1
Estimated Fair Value $ 30 $ 28
[1] (a) These amounts are recorded in Other with Investments and Other Assets on the Condensed Consolidated Balance Sheets