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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 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Investments        
Beginning balance $ 196 $ 210 $ 155 $ 111
Total pretax gains (losses) included in earnings   (33) 18 (21)
Purchases 2 12 38 79
Sales (3) (13) (7) (15)
Issuances   1    
Settlements (6)   (28) (45)
Transfers in and/or out of level 3   (1)   64
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 4 (6) 17 (3)
Ending balance 193 170 193 170
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance     (1)  
Ending balance 17   17  
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding   (49)   (49)
Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 23 22 (1) 13
Total pretax gains (losses) included in earnings   (33) 18 (21)
Purchases   (1) 24 50
Issuances   1    
Settlements (6)   (28) (45)
Transfers out of level 3   1   4
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities   (10) 4 (15)
Ending balance 17 (22) 17 (22)
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding   (49)   (49)
Investments [Member]        
Investments        
Beginning balance 173 188 156 98
Purchases 2 13 14 29
Sales (3) (13) (7) (15)
Transfers in and/or out of level 3       68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 4 4 13 12
Ending balance 176 192 176 192
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding       0
Duke Energy Carolinas [Member]        
Investments        
Beginning balance 171 168 154 79
Purchases 2 13 14 29
Sales (3) (13) (7) (15)
Settlements   3   2
Transfers in and/or out of level 3       68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 4 4 13 12
Ending balance 174 175 174 175
Duke Energy Carolinas [Member] | Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance   (3)   (2)
Settlements   3   2
Duke Energy Carolinas [Member] | Investments [Member]        
Investments        
Beginning balance 171 171 154 81
Purchases 2 13 14 29
Sales (3) (13) (7) (15)
Transfers in and/or out of level 3       68
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities 4 4 13 12
Ending balance 174 175 174 175
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 5 (28) (18) (4)
Total pretax gains (losses) included in earnings   (24) 21 (43)
Purchases 5   5 1
Sales (5)      
Settlements (1) (2) (4) (6)
Transfers out of level 3       (4)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities   (1)   1
Ending balance 4 (55) 4 (55)
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding       (52)
Duke Energy Indiana [Member] | Derivative [Member]        
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 17 45 14 12
Total pretax gains (losses) included in earnings   (13)   14
Purchases 1   19 49
Settlements (6)   (25) (38)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities   (10) 4 (15)
Ending balance $ 12 $ 22 $ 12 $ 22