Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Allowance for doubtful accounts - receivables	$ 46	$ 29
Regulatory Assets: Current	2,150	1,641
Current Assets: Other	638	462
Other Noncurrent Assets: Regulatory assets	12,487	12,421
Other Noncurrent Assets: Other	3,812	3,601
Current maturities of long-term debt	3,387	4,238
Long-term debt	60,448	55,625
Other Noncurrent Liabilities: Other	$ 1,650	$ 1,719
Preferred stock, par value (in usd per share)	$ 0	$ 0
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	2,000,000,000
Common stock, shares outstanding (in shares)	769,000,000
Cost	$ 161,819	$ 155,580
VIEs
Allowance for doubtful accounts - receivables of VIEs	76	117
Regulatory Assets: Current	105	53
Current Assets: Other	256	296
Other Noncurrent Assets: Regulatory assets	1,823	937
Other Noncurrent Assets: Other	92	81
Current maturities of long-term debt	243	472
Long-term debt	4,854	3,535
Other Noncurrent Liabilities: Other	$ 319	$ 316
Series A Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	40,000,000	40,000,000
Preferred stock, depositary shares outstanding (in shares)	40,000,000	40,000,000
Series B Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, depositary shares authorized (in shares)	1,000,000	1,000,000
Preferred stock, depositary shares outstanding (in shares)	1,000,000	1,000,000
Duke Energy Carolinas
Allowance for doubtful accounts - receivables	$ 1	$ 1
Regulatory Assets: Current	544	473
Current Assets: Other	95	20
Other Noncurrent Assets: Regulatory assets	2,935	2,996
Other Noncurrent Assets: Other	1,248	1,187
Current maturities of long-term debt	362	506
Long-term debt	12,595	11,412
Other Noncurrent Liabilities: Other	536	626
Cost	51,874	50,640
Duke Energy Carolinas | VIEs
Allowance for doubtful accounts - receivables of VIEs	41	22
Regulatory Assets: Current	12
Other Noncurrent Assets: Regulatory assets	220
Current maturities of long-term debt	5
Long-term debt	703
Progress Energy
Allowance for doubtful accounts - receivables	11	8
Regulatory Assets: Current	1,030	758
Current Assets: Other	125	109
Other Noncurrent Assets: Regulatory assets	5,909	5,775
Other Noncurrent Assets: Other	1,242	1,227
Current maturities of long-term debt	1,082	1,426
Long-term debt	19,591	17,688
Other Noncurrent Liabilities: Other	$ 526	$ 462
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100
Cost	$ 60,894	$ 57,892
Progress Energy | VIEs
Allowance for doubtful accounts - receivables of VIEs	25	29
Regulatory Assets: Current	93	53
Current Assets: Other	39	39
Other Noncurrent Assets: Regulatory assets	1,603	937
Current maturities of long-term debt	71	305
Long-term debt	2,293	1,252
Duke Energy Progress
Allowance for doubtful accounts - receivables	4	4
Regulatory Assets: Current	533	492
Current Assets: Other	83	60
Other Noncurrent Assets: Regulatory assets	4,118	3,976
Other Noncurrent Assets: Other	792	740
Current maturities of long-term debt	556	603
Long-term debt	9,543	8,505
Other Noncurrent Liabilities: Other	87	102
Cost	37,018	35,759
Duke Energy Progress | VIEs
Allowance for doubtful accounts - receivables of VIEs	17	19
Regulatory Assets: Current	39
Other Noncurrent Assets: Regulatory assets	720
Current maturities of long-term debt	15
Long-term debt	1,097
Duke Energy Florida
Allowance for doubtful accounts - receivables	8	4
Regulatory Assets: Current	497	265
Current Assets: Other	80	41
Other Noncurrent Assets: Regulatory assets	1,791	1,799
Other Noncurrent Assets: Other	399	335
Current maturities of long-term debt	76	823
Long-term debt	8,406	7,092
Other Noncurrent Liabilities: Other	309	209
Cost	23,865	22,123
Duke Energy Florida | VIEs
Allowance for doubtful accounts - receivables of VIEs	8	10
Regulatory Assets: Current	54	53
Current Assets: Other	39	39
Other Noncurrent Assets: Regulatory assets	883	937
Current maturities of long-term debt	56	305
Long-term debt	1,196	1,002
Duke Energy Ohio
Allowance for doubtful accounts - receivables	4	4
Regulatory Assets: Current	72	39
Current Assets: Other	57	31
Other Noncurrent Assets: Regulatory assets	635	610
Other Noncurrent Assets: Other	84	72
Current maturities of long-term debt		50
Long-term debt	3,168	3,014
Other Noncurrent Liabilities: Other	$ 101	$ 99
Common stock, par value (usd per share)	$ 8.50	$ 8.50
Common stock, shares authorized (in shares)	120,000,000	120,000,000
Common stock, shares outstanding (in shares)	90,000,000	90,000,000
Cost	$ 11,725	$ 11,022
Duke Energy Indiana
Allowance for doubtful accounts - receivables	3
Regulatory Assets: Current	277	125
Current Assets: Other	68	37
Other Noncurrent Assets: Regulatory assets	1,278	1,203
Other Noncurrent Assets: Other	296	253
Current maturities of long-term debt	84	70
Long-term debt	4,089	3,871
Other Noncurrent Liabilities: Other	44	30
Cost	17,343	17,382
Piedmont
Allowance for doubtful accounts - receivables	15	12
Regulatory Assets: Current	141	153
Current Assets: Other	9	20
Other Noncurrent Assets: Regulatory assets	316	302
Other Noncurrent Assets: Other	288	270
Current maturities of long-term debt		160
Long-term debt	2,968	2,620
Other Noncurrent Liabilities: Other	$ 158	$ 155
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100
Cost	$ 9,918	$ 9,134