Employee Benefit Plans (Information For Plans with Accumulated Benefit Obligation in Excess of Plan Assets) (Details) - Pension Plan - Qualified Plan - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation	$ 3,323
Accumulated benefit obligation	3,288
Fair value of plan assets	3,073
Duke Energy Ohio
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation	103	$ 153
Accumulated benefit obligation	99	143
Fair value of plan assets	31	67
Duke Energy Indiana
Information For Plans With Accumulated Benefit Obligation In Excess Of Plan Assets [Abstract]
Projected benefit obligation	198	284
Accumulated benefit obligation	193	275
Fair value of plan assets	$ 110	$ 173