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Regulatory Matters (Duke Energy Indiana Narrative) (Details) - Duke Energy Indiana - Indiana Rate Case 2019 - Indiana Utility Regulatory Commission - USD ($)
$ in Millions
Dec. 04, 2019
Sep. 09, 2019
Jul. 02, 2019
Dec. 31, 2018
Public Utilities, General Disclosures [Line Items]        
Requested rate increase (decrease)   $ 395 $ 395  
Disclosure of rate matters, rate base       $ 10,200
Requested rate increase (decrease), amended, amount $ 396 393    
Requested rate increase (decrease), amount amended from initial request   $ (2)    
Requested rate increase (decrease), percent     15.00%  
Requested rate increase (decrease), percentage, net of tax 15.60%   17.00%