Asset Retirement Obligations (ARO Rollforward) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	$ 12,728
Accretion expense	391
Liabilities settled	(494)
Revision in estimates of cash flows	(392)
Balance at end of period	12,233
Duke Energy Carolinas
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	5,382
Accretion expense	189
Liabilities settled	(171)
Revision in estimates of cash flows	(132)
Balance at end of period	5,268
Progress Energy
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	6,181
Accretion expense	178
Liabilities settled	(247)
Revision in estimates of cash flows	(182)
Balance at end of period	5,930
Duke Energy Progress
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	5,823
Accretion expense	169
Liabilities settled	(196)
Revision in estimates of cash flows	(174)
Balance at end of period	5,622
Duke Energy Florida
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	358
Accretion expense	9
Liabilities settled	(51)
Revision in estimates of cash flows	(8)
Balance at end of period	308
Duke Energy Ohio
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	154
Accretion expense	5
Liabilities settled	(11)
Revision in estimates of cash flows	(10)
Balance at end of period	138
Duke Energy Indiana
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	951
Accretion expense	24
Liabilities settled	(66)
Revision in estimates of cash flows	(67)
Balance at end of period	842
Piedmont
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance at beginning of period	26
Accretion expense	2
Balance at end of period	$ 28