Asset Retirement Obligations (ARO Rollforward) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 9,156
Accretion expense	204
Liabilities settled	(306)
Revision in estimates of cash flows	1,300
Balance at end of period	10,354
Duke Energy Carolinas
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	4,013
Accretion expense	90
Liabilities settled	(95)
Revision in estimates of cash flows	104
Balance at end of period	4,112
Progress Energy
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	4,145
Accretion expense	96
Liabilities settled	(167)
Revision in estimates of cash flows	717
Balance at end of period	4,791
Duke Energy Progress
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	3,870
Accretion expense	91
Liabilities settled	(120)
Revision in estimates of cash flows	715
Balance at end of period	4,556
Duke Energy Florida
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	275
Accretion expense	5
Liabilities settled	(47)
Revision in estimates of cash flows	2
Balance at end of period	235
Duke Energy Ohio
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	136
Accretion expense	3
Liabilities settled	(3)
Revision in estimates of cash flows	0
Balance at end of period	136
Duke Energy Indiana
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	809
Accretion expense	17
Liabilities settled	(40)
Revision in estimates of cash flows	496
Balance at end of period	1,282
Piedmont
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	26
Accretion expense	1
Liabilities settled	0
Revision in estimates of cash flows	0
Balance at end of period	$ 27