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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Allowance for doubtful accounts - receivables $ 16 $ 14
Regulatory assets 2,005 1,437
Regulatory assets, noncurrent 13,617 12,442
Other (including amounts related to VIEs) 1,049 634
Current maturities of long-term debt 3,406 3,244
Long-Term Debt $ 51,123 $ 49,035
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 2,000,000,000 2,000,000,000
Common stock, shares outstanding 727,000,000 700,000,000
Other (includes amounts related to VIEs) $ 1,650 $ 1,581
Variable Interest Entity [Member]    
Allowance for doubtful accounts - receivables of VIEs 55 54
Regulatory assets 52 51
Regulatory assets, noncurrent 1,041 1,091
Other (including amounts related to VIEs) 162 214
Current maturities of long-term debt 227 225
Long-Term Debt 3,998 4,306
Other (includes amounts related to VIEs) 212 241
Duke Energy Carolinas [Member]    
Allowance for doubtful accounts - receivables 2 2
Regulatory assets 520 299
Regulatory assets, noncurrent 3,457 2,853
Other (including amounts related to VIEs) 72 19
Current maturities of long-term debt 6 1,205
Long-Term Debt 10,633 8,598
Other (includes amounts related to VIEs) 671 566
Duke Energy Carolinas [Member] | Variable Interest Entity [Member]    
Allowance for doubtful accounts - receivables of VIEs 7 7
Progress Energy [Member]    
Allowance for doubtful accounts - receivables 5 4
Regulatory assets 1,137 741
Regulatory assets, noncurrent 6,564 6,010
Other (including amounts related to VIEs) 125 334
Current maturities of long-term debt 1,672 771
Long-Term Debt $ 17,089 $ 16,916
Common stock, par value $ 0.01 $ 0.01
Common stock, shares authorized 100 100
Common stock, shares outstanding 100 100
Other (includes amounts related to VIEs) $ 351 $ 302
Progress Energy [Member] | Variable Interest Entity [Member]    
Allowance for doubtful accounts - receivables of VIEs 8 7
Regulatory assets 52 51
Regulatory assets, noncurrent 1,041 1,091
Other (including amounts related to VIEs) 39 44
Current maturities of long-term debt 53 53
Long-Term Debt 1,636 1,689
Duke Energy Progress [Member]    
Allowance for doubtful accounts - receivables 2 1
Regulatory assets 703 352
Regulatory assets, noncurrent 4,111 3,507
Other (including amounts related to VIEs) 62 97
Current maturities of long-term debt 603 3
Long-Term Debt 7,451 7,204
Other (includes amounts related to VIEs) 106 45
Duke Energy Progress [Member] | Variable Interest Entity [Member]    
Allowance for doubtful accounts - receivables of VIEs 5 5
Duke Energy Florida [Member]    
Allowance for doubtful accounts - receivables 3 3
Regulatory assets 434 389
Regulatory assets, noncurrent 2,454 2,503
Other (including amounts related to VIEs) 46 86
Current maturities of long-term debt 270 768
Long-Term Debt 7,051 6,327
Other (includes amounts related to VIEs) 93 108
Duke Energy Florida [Member] | Variable Interest Entity [Member]    
Allowance for doubtful accounts - receivables of VIEs 3 2
Regulatory assets 52 51
Regulatory assets, noncurrent 1,041 1,091
Other (including amounts related to VIEs) 39 40
Current maturities of long-term debt 53 53
Long-Term Debt 1,336 1,389
Duke Energy Ohio [Member]    
Allowance for doubtful accounts - receivables 2 3
Regulatory assets 33 49
Regulatory assets, noncurrent 531 445
Other (including amounts related to VIEs) 24 39
Current maturities of long-term debt 551 3
Long-Term Debt $ 1,589 $ 2,039
Common stock, par value $ 8.50 $ 8.50
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares outstanding 90,000,000 90,000,000
Other (includes amounts related to VIEs) $ 93 $ 108
Duke Energy Indiana [Member]    
Allowance for doubtful accounts - receivables 2 2
Regulatory assets 175 165
Regulatory assets, noncurrent 982 978
Other (including amounts related to VIEs) 35 30
Current maturities of long-term debt 63 3
Long-Term Debt 3,569 3,630
Other (includes amounts related to VIEs) 16 18
Piedmont Natural Gas [Member]    
Allowance for doubtful accounts - receivables 2 2
Regulatory assets 54 95
Regulatory assets, noncurrent 303 283
Other (including amounts related to VIEs) 19 52
Current maturities of long-term debt 350 250
Long-Term Debt $ 1,788 $ 1,787
Common stock, shares authorized 100 100
Common stock, shares outstanding 100 100
Other (includes amounts related to VIEs) $ 177 $ 170