Variable Interest Entities (Schedule of Non-Consolidated VIEs) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	$ 970	$ 961
Other noncurrent assets	3,812	3,601
Total Assets	169,587	162,388	$ 158,838
Other current liabilities	2,471	2,936
Other Noncurrent Liabilities: Other	1,650	1,719
Non-consolidated VIEs
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	523	530
Other noncurrent assets	61	31
Total Assets	584	561
Other current liabilities	51	933
Other Noncurrent Liabilities: Other	57	18
Total liabilities	108	951
Net (liabilities) assets	476	(390)
Duke Energy Ohio
Variable Interest Entity [Line Items]
Receivables from affiliated companies	122	102
Other noncurrent assets	84	72
Total Assets	10,774	10,025	$ 9,338
Other current liabilities	82	70
Other Noncurrent Liabilities: Other	101	99
Duke Energy Ohio | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Receivables from affiliated companies	79	83
Total Assets	79	83
Net (liabilities) assets	79	83
Duke Energy Indiana
Variable Interest Entity [Line Items]
Receivables from affiliated companies	98	112
Other noncurrent assets	296	253
Total Assets	14,488	14,041
Other current liabilities	105	83
Other Noncurrent Liabilities: Other	44	30
Duke Energy Indiana | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Receivables from affiliated companies	97	110
Total Assets	97	110
Net (liabilities) assets	97	110
Pipeline Investments | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	15
Other noncurrent assets	61	31
Total Assets	76	31
Other current liabilities	47	928
Other Noncurrent Liabilities: Other	54	8
Total liabilities	101	936
Net (liabilities) assets	(25)	(905)
Commercial Renewables | Non-consolidated VIEs
Variable Interest Entity [Line Items]
Investments in equity method unconsolidated affiliates	508	530
Total Assets	508	530
Other current liabilities	4	5
Other Noncurrent Liabilities: Other	3	10
Total liabilities	7	15
Net (liabilities) assets	$ 501	$ 515