Regulatory Matters (Duke Energy Indiana Narrative) (Details) - USD ($)				3 Months Ended								12 Months Ended
	Jun. 29, 2020	Dec. 04, 2019	Jul. 02, 2019	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Jun. 15, 2022
Public Utilities, General Disclosures [Line Items]
Revenues				$ 7,351,000,000	$ 7,842,000,000	$ 6,564,000,000	$ 7,011,000,000	$ 6,117,000,000	$ 6,834,000,000	$ 5,638,000,000	$ 6,032,000,000	$ 28,768,000,000	$ 24,621,000,000	$ 23,366,000,000
Asset impairment charges												434,000,000	353,000,000	978,000,000
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Revenues												3,922,000,000	3,174,000,000	$ 2,795,000,000
Asset impairment charges												388,000,000	9,000,000
Duke Energy Indiana | Indiana Utility Regulatory Commission | Indiana Rate Case 2019
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)			$ 395,000,000
Requested rate increase (decrease), percentage, net of tax		15.60%
Requested rate increase (decrease), amended, amount		$ 396,000,000
Approved rate increase (decrease) amount by state commission	$ 146,000,000
Disclosure of rate matters, rate base								$ 10,200,000,000					$ 10,200,000,000
Public utilities, disclosure of rate matters, rate base reduction due to depreciation methodology, percent	50.00%
Public utilities, disclosure of rate matters, rate base reduction due to approved return on equity, percent	20.00%
Approved return on equity percentage (as a percent)	9.70%
Requested return on equity, percentage	10.40%
Public utilities, disclosure of rate matters, rate base reduction due to earnings adjustments, percent	20.00%
Public utilities, disclosure of rate matters, reduction of rate base	$ 200,000,000
Public utilities, approved return on equity, step two estimated (as a percent)	25.00%
Public utilities, approved return on equity, step one estimated percentage	75.00%
Impairment of assets and other charges												211,000,000
Revenues												46,000,000
Duke Energy Indiana | Indiana Utility Regulatory Commission | TDSIG 2.0
Public Utilities, General Disclosures [Line Items]
Future investments in new cost															$ 2,000,000,000
Duke Energy Indiana | Indiana Utility Regulatory Commission | Indiana Coal Ash Recovery
Public Utilities, General Disclosures [Line Items]
Asset impairment charges												$ 175,000,000