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Fair Value Measurements (Reconciliation of Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Investments        
Beginning balance $ 183 $ 85 $ 155 $ 111
Total pretax gains (losses) included in earnings (6) (6) 18 12
Purchases 27 66 36 67
Sales (3) (1) (4) (2)
Issuances   (1)   (1)
Settlements (12) (6) (22) (45)
Transfers in and/or out of level 3   70   65
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 7 3 13 3
Ending balance 196 210 196 210
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance     (1)  
Ending balance 23   23  
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding       (25)
Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 14 (14) (1) 13
Total pretax gains (losses) included in earnings (6) (6) 18 12
Purchases 24 51 24 51
Issuances   (1)   (1)
Settlements (12) (6) (22) (45)
Transfers out of level 3   (2)   3
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 3 (4) 4 (5)
Ending balance 23 22 23 22
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding       (25)
Investments [Member]        
Investments        
Beginning balance 169 99 156 98
Purchases 3 15 12 16
Sales (3) (1) (4) (2)
Transfers in and/or out of level 3   68   68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 4 7 9 8
Ending balance 173 188 173 188
Duke Energy Carolinas [Member]        
Investments        
Beginning balance 167 78 154 79
Purchases 3 15 12 16
Sales   (1)    
Issuances (3)   (4) (2)
Settlements   1   (1)
Transfers in and/or out of level 3   68   68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 4 7 9 8
Ending balance 171 168 171 168
Duke Energy Carolinas [Member] | Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance   (4)   (2)
Settlements   1   (1)
Ending balance   (3)   (3)
Duke Energy Carolinas [Member] | Investments [Member]        
Investments        
Beginning balance 167 82 154 81
Purchases 3 15 12 16
Sales   (1)    
Issuances (3)   (4) (2)
Transfers in and/or out of level 3   68   68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 4 7 9 8
Ending balance 171 171 171 171
Progress Energy [Member] | Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance   (3)    
Total pretax gains (losses) included in earnings   3    
Transfers out of level 3   2   2
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities   (2)   (2)
Duke Energy Progress [Member] | Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance   (3)    
Total pretax gains (losses) included in earnings   3    
Duke Energy Ohio [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance     (18)  
Duke Energy Ohio [Member] | Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 7 (19) (18) (4)
Total pretax gains (losses) included in earnings (4) (13) 21 (19)
Purchases   1   1
Sales 5   5  
Settlements (3)   (3) (4)
Transfers out of level 3   1   (4)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities   2   2
Ending balance 5 (28) 5 (28)
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding       (27)
Duke Energy Indiana [Member] | Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 3 7 14 12
Total pretax gains (losses) included in earnings       27
Purchases 18 49 18 49
Settlements (10) (7) (19) (38)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 6 (4) 4 (5)
Ending balance $ 17 $ 45 $ 17 $ 45