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, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Sep. 20, 2023	Feb. 03, 2023	Jun. 15, 2022	Dec. 31, 2020
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges												$ 85,000,000	$ 434,000,000	$ 353,000,000
Operating Revenues				$ 7,212,000,000	$ 7,994,000,000	$ 6,578,000,000	$ 7,276,000,000	$ 7,351,000,000	$ 7,842,000,000	$ 6,564,000,000	$ 7,011,000,000	29,060,000,000	28,768,000,000	24,621,000,000
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges													388,000,000	9,000,000
Operating Revenues												$ 3,399,000,000	3,922,000,000	$ 3,174,000,000
Duke Energy Indiana | Indiana Rate Case 2019 | Indiana Utility Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Requested rate increase (decrease)			$ 395,000,000
Requested rate increase (decrease), net of tax (as a percent)		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
Public utilities, disclosure of rate matters, reduction of rate base	$ 200,000,000
Public utilities, approved return on equity, step one estimated percentage (as a percent)	75.00%
Public utilities, approved return on equity, step two estimated (as a percent)	25.00%
Impairment of assets and other charges													211,000,000
Operating Revenues													46,000,000
Refunds to customers						$ 70,000,000										$ 70,000,000
Duke Energy Indiana | Indiana Coal Ash Recovery | Indiana Utility Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Impairment of assets and other charges													$ 175,000,000
Simple interest of refunds (as a percent)															4.71%
Duke Energy Indiana | TDSIG 2.0 | Indiana Utility Regulatory Commission
Public Utilities, General Disclosures [Line Items]
Future investments in new cost																	$ 2,000,000,000