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Schedule I - Condensed Parent Company Financial Statements (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Nov. 30, 2011
Aug. 31, 2011
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Apr. 30, 2011
Dec. 31, 2011
Parent Company [Member]
Dec. 31, 2010
Parent Company [Member]
Dec. 31, 2009
Parent Company [Member]
Nov. 30, 2011
Parent Company [Member]
Sep. 30, 2011
Parent Company [Member]
Dec. 31, 2011
Duke Energy Carolinas [Member]
Dec. 31, 2011
Duke Energy Indiana [Member]
Nov. 30, 2011
2.15% Senior Notes [Member]
Parent Company [Member]
Aug. 31, 2011
3.55% Senior Notes [Member]
Parent Company [Member]
Mar. 31, 2010
3.35% Senior Notes [Member]
Parent Company [Member]
Nov. 30, 2011
After Merger With Progress Energy [Member]
Parent Company [Member]
Nov. 30, 2011
Available At Closing [Member]
Parent Company [Member]
Face value of guarantees       $ 19,000,000       $ 2,000,000,000                      
Principal amount of senior notes 500,000,000 500,000,000 450,000,000                       500,000,000 500,000,000 450,000,000    
Notes fixed interest rate 2.15% 3.55% 3.35%                       2.15% 3.55% 3.35%    
Senior notes maturity date Nov. 15, 2016 Sep. 15, 2021 Apr. 01, 2015                           Apr. 01, 2015    
Repayments of lines of credit                                 274,000,000    
Demand notes, maximum amount available for sale             1,000,000,000                        
Conditional capacity             500,000,000                        
Notes payable and commercial paper       154,000,000       154,000,000       75,000,000   300,000,000          
Maximum potential amount of future payments associated with guarantees               4,700,000,000                      
Accounts receivable gross               608,000,000 872,000,000                    
Notes receivable       62,000,000 42,000,000     450,000,000 450,000,000                    
Proceeds from sale of notes       79,000,000                              
Increase (decrease) in money pool receivable               (264,000,000) (263,000,000)                    
Other nonoperating income       51,000,000 53,000,000 38,000,000   4,000,000 7,000,000 12,000,000                  
Payments for contributed capital                   250,000,000                  
Forgiven advance to subsidiary               29,000,000 15,000,000                    
Proceeds from dividends received                 350,000,000       299,000,000            
Borrowing sublimit               1,250,000,000                      
Facility Size                     $ 6,000,000,000             $ 2,000,000,000 $ 4,000,000,000