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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Aug. 01, 2016
Debt Instrument [Line Items]      
Debt issuances $ 8,527 $ 8,527  
Parent Company [Member]      
Debt Instrument [Line Items]      
Debt issuances 4,100 4,100  
Duke Energy Carolinas [Member]      
Debt Instrument [Line Items]      
Debt issuances 1,000 1,000  
Duke Energy Progress [Member]      
Debt Instrument [Line Items]      
Debt issuances 450 450  
Duke Energy Florida [Member]      
Debt Instrument [Line Items]      
Debt issuances 1,894 1,894  
Duke Energy Ohio [Member]      
Debt Instrument [Line Items]      
Debt issuances 250 250  
Duke Energy Indiana [Member]      
Debt Instrument [Line Items]      
Debt issuances 500 500  
Unsecured Debt [Member] | April 2016 2.875% Unsecured Note Maturing April 2023 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 350 $ 350  
Interest rate 2.875% 2.875%  
Unsecured Debt [Member] | August 2016 1.800% Unsecured Note Maturing September 2021 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 750 $ 750  
Interest rate 1.80% 1.80%  
Unsecured Debt [Member] | August 2016 2.650% Unsecured Note Maturing September 2026 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 1,500 $ 1,500  
Interest rate 2.65% 2.65%  
Unsecured Debt [Member] | August 2016 3.750% Unsecured Note Maturing September 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 1,500 $ 1,500  
Interest rate 3.75% 3.75%  
Unsecured Debt [Member] | Parent Company [Member] | April 2016 2.875% Unsecured Note Maturing April 2023 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 350 $ 350  
Interest rate 2.875% 2.875%  
Unsecured Debt [Member] | Parent Company [Member] | August 2016 1.800% Unsecured Note Maturing September 2021 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 750 $ 750  
Interest rate 1.80% 1.80%  
Unsecured Debt [Member] | Parent Company [Member] | August 2016 2.650% Unsecured Note Maturing September 2026 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 1,500 $ 1,500  
Interest rate 2.65% 2.65%  
Unsecured Debt [Member] | Parent Company [Member] | August 2016 3.750% Unsecured Note Maturing September 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 1,500 $ 1,500  
Interest rate 3.75% 3.75%  
First Mortgage [Member] | March 2016 2.500% First Mortgage Bond Maturing March 2023 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 500 $ 500  
Interest rate 2.50% 2.50%  
First Mortgage [Member] | March 2016 3.875% First Mortgage Bond Maturing March 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 500 $ 500  
Interest rate 3.875% 3.875%  
First Mortgage [Member] | May 2016 3.750% First Mortgage Bond Maturing May 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 500 $ 500  
Interest rate 3.75% 3.75%  
Repayments of Debt $ 150 $ 325  
First Mortgage [Member] | June 2016 3.700% First Mortgage Bond Maturing June 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 250 $ 250  
Interest rate 3.70% 3.70%  
First Mortgage [Member] | September 2016 3.400% First Mortgage Bond Maturing October 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 600 $ 600  
Interest rate 3.40% 3.40%  
First Mortgage [Member] | September 2016 3.700% First Mortgage Bond Maturing October 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 450 $ 450  
Interest rate 3.70% 3.70%  
First Mortgage [Member] | Duke Energy Carolinas [Member] | March 2016 2.500% First Mortgage Bond Maturing March 2023 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 500 $ 500  
Interest rate 2.50% 2.50%  
First Mortgage [Member] | Duke Energy Carolinas [Member] | March 2016 3.875% First Mortgage Bond Maturing March 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 500 $ 500  
Interest rate 3.875% 3.875%  
First Mortgage [Member] | Duke Energy Progress [Member] | September 2016 3.700% First Mortgage Bond Maturing October 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 450 $ 450  
Interest rate 3.70% 3.70%  
First Mortgage [Member] | Duke Energy Florida [Member] | September 2016 3.400% First Mortgage Bond Maturing October 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 600 $ 600  
Interest rate 3.40% 3.40%  
First Mortgage [Member] | Duke Energy Ohio [Member] | June 2016 3.700% First Mortgage Bond Maturing June 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 250 $ 250  
Interest rate 3.70% 3.70%  
First Mortgage [Member] | Duke Energy Indiana [Member] | May 2016 3.750% First Mortgage Bond Maturing May 2046 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 500 $ 500  
Interest rate 3.75% 3.75%  
Repayments of Debt $ 150 $ 325  
Secured Debt [Member] | June 2016 1.196% Secured Debt Maturing March 2020 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 183 $ 183  
Interest rate 1.196% 1.196%  
Secured Debt [Member] | June 2016 1.731% Secured Debt Maturing September 2022 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 150 $ 150  
Interest rate 1.731% 1.731%  
Secured Debt [Member] | June 2016 2.538% Secured Debt Maturing September 2029 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 436 $ 436  
Interest rate 2.538% 2.538%  
Secured Debt [Member] | June 2016 2.858% Secured Debt Maturing March 2033 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 250 $ 250  
Interest rate 2.858% 2.858%  
Secured Debt [Member] | June 2016 3.112% Secured Debt Maturing September 2036 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 275 $ 275  
Interest rate 3.112% 3.112%  
Secured Debt [Member] | August 2016 2.747% Secured Debt Maturing June 2034 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 228 $ 228  
Interest rate 2.747% 2.747%  
Secured Debt [Member] | August 2016 2.747% Secured Debt Maturing June 2020 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 105 $ 105  
Interest rate 2.747% 2.747%  
Secured Debt [Member] | Duke Energy Florida [Member] | June 2016 1.196% Secured Debt Maturing March 2020 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 183 $ 183  
Interest rate 1.196% 1.196%  
Secured Debt [Member] | Duke Energy Florida [Member] | June 2016 1.731% Secured Debt Maturing September 2022 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 150 $ 150  
Interest rate 1.731% 1.731%  
Secured Debt [Member] | Duke Energy Florida [Member] | June 2016 2.538% Secured Debt Maturing September 2029 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 436 $ 436  
Interest rate 2.538% 2.538%  
Secured Debt [Member] | Duke Energy Florida [Member] | June 2016 2.858% Secured Debt Maturing March 2033 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 250 $ 250  
Interest rate 2.858% 2.858%  
Secured Debt [Member] | Duke Energy Florida [Member] | June 2016 3.112% Secured Debt Maturing September 2036 [Member]      
Debt Instrument [Line Items]      
Debt issuances $ 275 $ 275  
Interest rate 3.112% 3.112%  
Piedmont Natural Gas [Member] | Unsecured Debt [Member]      
Debt Instrument [Line Items]      
Debt issuances     $ 3,750