Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Allowance for doubtful accounts - receivables	$ 29	$ 22
Regulatory Assets: Current	1,641	1,796
Current Assets: Other	462	764
Other Noncurrent Assets: Regulatory assets	12,421	13,222
Other Noncurrent Assets: Other	3,601	3,289
Current maturities of long-term debt	4,238	3,141
Long-term debt	55,625	54,985
Other Noncurrent Liabilities: Other	$ 1,719	$ 1,581
Preferred stock, par value (in usd per share)	$ 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	733,000,000
VIEs
Allowance for doubtful accounts - receivables of VIEs	$ 117	$ 54
Regulatory Assets: Current	53	52
Current Assets: Other	296	242
Other Noncurrent Assets: Regulatory assets	937	989
Other Noncurrent Assets: Other	81	110
Current maturities of long-term debt	472	216
Long-term debt	3,535	3,997
Other Noncurrent Liabilities: Other	$ 316	$ 228
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	$ 3
Regulatory Assets: Current	473	550
Current Assets: Other	20	21
Other Noncurrent Assets: Regulatory assets	2,996	3,360
Other Noncurrent Assets: Other	1,187	1,149
Current maturities of long-term debt	506	458
Long-term debt	11,412	11,142
Other Noncurrent Liabilities: Other	626	627
Duke Energy Carolinas | VIEs
Allowance for doubtful accounts - receivables of VIEs	22	7
Progress Energy
Allowance for doubtful accounts - receivables	8	7
Regulatory Assets: Current	758	946
Current Assets: Other	109	210
Other Noncurrent Assets: Regulatory assets	5,775	6,346
Other Noncurrent Assets: Other	1,227	1,049
Current maturities of long-term debt	1,426	1,577
Long-term debt	17,688	17,907
Other Noncurrent Liabilities: Other	$ 462	$ 383
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
Progress Energy | VIEs
Allowance for doubtful accounts - receivables of VIEs	$ 29	$ 9
Regulatory Assets: Current	53	52
Current Assets: Other	39	39
Other Noncurrent Assets: Regulatory assets	937	989
Current maturities of long-term debt	305	54
Long-term debt	1,252	1,632
Duke Energy Progress
Allowance for doubtful accounts - receivables	4	3
Regulatory Assets: Current	492	526
Current Assets: Other	60	60
Other Noncurrent Assets: Regulatory assets	3,976	4,152
Other Noncurrent Assets: Other	740	651
Current maturities of long-term debt	603	1,006
Long-term debt	8,505	7,902
Other Noncurrent Liabilities: Other	102	92
Duke Energy Progress | VIEs
Allowance for doubtful accounts - receivables of VIEs	19	5
Duke Energy Florida
Allowance for doubtful accounts - receivables	4	3
Regulatory Assets: Current	265	419
Current Assets: Other	41	58
Other Noncurrent Assets: Regulatory assets	1,799	2,194
Other Noncurrent Assets: Other	335	311
Current maturities of long-term debt	823	571
Long-term debt	7,092	7,416
Other Noncurrent Liabilities: Other	209	136
Duke Energy Florida | VIEs
Allowance for doubtful accounts - receivables of VIEs	10	4
Regulatory Assets: Current	53	52
Current Assets: Other	39
Other Noncurrent Assets: Regulatory assets	937	989
Current maturities of long-term debt	305	54
Long-term debt	1,002	1,307
Duke Energy Ohio
Allowance for doubtful accounts - receivables	4	4
Regulatory Assets: Current	39	49
Current Assets: Other	31	21
Other Noncurrent Assets: Regulatory assets	610	549
Other Noncurrent Assets: Other	72	52
Current maturities of long-term debt	50
Long-term debt	3,014	2,594
Other Noncurrent Liabilities: Other	$ 99	$ 94
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
Duke Energy Indiana
Allowance for doubtful accounts - receivables	$ 3	$ 3
Regulatory Assets: Current	125	90
Current Assets: Other	37	60
Other Noncurrent Assets: Regulatory assets	1,203	1,082
Other Noncurrent Assets: Other	253	234
Current maturities of long-term debt	70	503
Long-term debt	3,871	3,404
Other Noncurrent Liabilities: Other	30	18
Piedmont
Allowance for doubtful accounts - receivables	12	6
Regulatory Assets: Current	153	73
Current Assets: Other	20	28
Other Noncurrent Assets: Regulatory assets	302	290
Other Noncurrent Assets: Other	270	121
Current maturities of long-term debt	160	0
Long-term debt	2,620	2,384
Other Noncurrent Liabilities: Other	$ 155	$ 148
Common stock, shares authorized (in shares)	100	100
Common stock, shares outstanding (in shares)	100	100