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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, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Investments        
Beginning balance $ 210 $ 10 $ 111 $ 13
Total pretax gains (losses) included in earnings (33) 13 (21) (8)
Total pretax gains (losses) included in comprehensive income   1   (1)
Purchases 12 2 79 26
Sales (13) (2) (15) (5)
Issuances 1 4   9
Settlements   (5) (45) (8)
Transfers in and/or out of level 3 (1) 34 64 34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities (6) 2 (3) (1)
Ending balance 170 59 170 59
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 22 (87) 13 (85)
Total pretax gains (losses) included in earnings (33) 13 (21) (8)
Total pretax gains (losses) included in comprehensive income          
Purchases (1)    50 21
Sales            
Issuances 1 4   9
Settlements   (3) (45) (5)
Transfers out of level 3 (1) 34 (4) 34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities (10) 1 (15) (4)
Ending balance (22) (38) (22) (38)
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding (49)   (49)  
Investments [Member]
       
Investments        
Beginning balance 188 97 98 98
Total pretax gains (losses) included in earnings            
Total pretax gains (losses) included in comprehensive income   1   (1)
Purchases 13 2 29 5
Sales (13) (2) (15) (5)
Issuances           
Settlements   (2)    (3)
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 1 12 3
Ending balance 192 97 192 97
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          
Duke Energy Carolinas [Member]
       
Investments        
Beginning balance 168 70 79 60
Purchases 13 2 29 5
Sales (13) (2) (15) (5)
Settlements 3   2 8
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 1 12 3
Ending balance 175 71 175 71
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance (3) (4) (2) (12)
Purchases            
Sales            
Settlements 3   2 8
Transfers out of level 3         
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities            
Ending balance    (4)    (4)
Duke Energy Carolinas [Member] | Investments [Member]
       
Investments        
Beginning balance 171 74 81 72
Purchases 13 2 29 5
Sales (13) (2) (15) (5)
Settlements           
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 1 12 3
Ending balance 175 75 175 75
Progress Energy [Member]
       
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance    (35)    (38)
Issuances    2    10
Transfers out of level 3 2 34    34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities (2) (1)    (6)
Ending balance            
Duke Energy Progress [Member]
       
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance    (35)    (38)
Issuances          9
Settlements    2      
Transfers out of level 3    34    34
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities    (1)    (5)
Ending balance            
Duke Energy Ohio [Member]
       
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance (28) (19) (4) (6)
Total pretax gains (losses) included in earnings (24) 11 (43) (4)
Purchases       1 1
Settlements (2) 2 (6)   
Transfers out of level 3       (4)   
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities (1)    1 3
Ending balance (55) (6) (55) (6)
Pretax amounts included in the Condensed Consolidated Statements of Comprehensive Income related to Level 3 measurements outstanding      (52)  
Duke Energy Indiana [Member]
       
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]        
Beginning balance 45 18 12 10
Total pretax gains (losses) included in earnings (13) 3 14 5
Purchases       49 20
Settlements    (10) (38) (23)
Total gains (losses) included on the Condensed Consolidated Balance Sheet as regulatory assets or liabilities (10) 3 (15) 2
Ending balance $ 22 $ 14 $ 22 $ 14