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Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)
$ in Millions
 3 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Debt issuances $ 2,337  
Current maturities of long-term debt 3,472 $ 2,319
Parent Company [Member]    
Debt Instrument [Line Items]    
Debt issuances 750  
Duke Energy Carolinas [Member]    
Debt Instrument [Line Items]    
Current maturities of long-term debt 704 116
Duke Energy Progress [Member]    
Debt Instrument [Line Items]    
Current maturities of long-term debt 203 452
Duke Energy Florida [Member]    
Debt Instrument [Line Items]    
Debt issuances 900  
Current maturities of long-term debt 819 326
Duke Energy Ohio [Member]    
Debt Instrument [Line Items]    
Debt issuances 100  
Current maturities of long-term debt 1 1
Duke Energy Indiana [Member]    
Debt Instrument [Line Items]    
Current maturities of long-term debt 3 $ 3
Unsecured Debt [Member] | April 2017 Debt Issuance, 3.364% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 420  
Interest rate 3.364%  
Unsecured Debt [Member] | June 2017 Debt Issuance, 2.100% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 330  
Interest rate 2.10%  
Unsecured Debt [Member] | April 2017 Maturity [Member]    
Debt Instrument [Line Items]    
Repayments of Debt $ 400  
Unsecured Debt [Member] | Parent Company [Member] | April 2017 Debt Issuance, 3.364% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 420  
Interest rate 3.364%  
Unsecured Debt [Member] | Parent Company [Member] | June 2017 Debt Issuance, 2.100% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 330  
Interest rate 2.10%  
Unsecured Debt [Member] | Parent Company [Member] | April 2017 Maturity [Member]    
Debt Instrument [Line Items]    
Repayments of Debt $ 400  
Secured Debt [Member] | February 2017 Debt Issuance, 4.120% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 587  
Interest rate 4.12%  
First Mortgage [Member] | January 2017 Debt Issuance, 1.850% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 250  
Interest rate 1.85%  
First Mortgage [Member] | January 2017 Debt Issuance, 3.200% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 650  
Interest rate 3.20%  
First Mortgage [Member] | March 2017 Debt Issuance, 3.700% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 100  
Interest rate 3.70%  
First Mortgage [Member] | Duke Energy Florida [Member] | January 2017 Debt Issuance, 1.850% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 250  
Interest rate 1.85%  
First Mortgage [Member] | Duke Energy Florida [Member] | January 2017 Debt Issuance, 3.200% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 650  
Interest rate 3.20%  
First Mortgage [Member] | Duke Energy Florida [Member] | First Mortgage Bonds Maturing September 2017, 5.800% Coupon [Member]    
Debt Instrument [Line Items]    
Interest rate 5.80%  
Current maturities of long-term debt $ 250  
First Mortgage [Member] | Duke Energy Ohio [Member] | March 2017 Debt Issuance, 3.700% Coupon [Member]    
Debt Instrument [Line Items]    
Debt issuances $ 100  
Interest rate 3.70%