Investments in Unconsolidated Affiliates (Significant Subsidiaries) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	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
Investments In Unconsolidated Affiliates [Line Items]
Current assets	$ 13,222				$ 9,940				$ 13,222	$ 9,940
Noncurrent assets	53,116				54,111				53,116	54,111
Current liabilities	18,873				15,931				18,873	15,931
Noncurrent liabilities	40,299				42,072				40,299	42,072
Membership interests	2,531				1,840				2,531	1,840
Operating loss	1,194	$ 2,056	$ 1,448	$ 1,314	1,110	$ 1,726	$ 1,198	$ 1,466	6,012	5,500	$ 4,571
Net income (loss)	$ (658)	$ 1,413	$ 880	$ 820	$ 664	$ 1,276	$ 698	$ 941	2,455	3,579	1,082
Net loss attributable to Duke Energy									$ 2,550	$ 3,908	1,377
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Investments In Unconsolidated Affiliates [Line Items]
Operating loss											(4,612)
Net income (loss)											(4,512)
Net loss attributable to Duke Energy											$ (2,121)