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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net income |  | $ 454 | $ 622 | $ 703 | $ 717 | $ 2,644 | $ 3,064 | $ 2,170 |
Net Income Attributable to Parent |  | 464 | 620 | 703 | 716 | 2,666 | 3,059 | 2,152 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) |  |  |  |  |  | 4,696 | 4,046 | 3,880 |
Equity component of AFUDC |  |  |  |  |  | (221) | (237) | (200) |
Losses (Gains) on sales of other assets |  |  |  |  |  | 88 | (33) | 477 |
Impairment charges |  |  |  |  |  | 402 | 282 | 212 |
Deferred income taxes |  |  |  |  |  | 1,079 | 1,433 | 900 |
Equity in (earnings) losses of unconsolidated affiliates |  |  |  |  |  | (83) | (119) | 15 |
Accrued pension and other post-retirement benefit costs |  |  |  |  |  | 61 | 8 | 21 |
Contributions to qualified pension plans |  |  |  |  |  | (141) | (19) | (155) |
Payments for asset retirement obligations |  |  |  |  |  | (533) | (571) | (608) |
Payment for the disposal of other assets |  |  |  |  |  | (105) |  |  |
Other rate case adjustments |  |  |  |  |  | 37 |  |  |
Provision for rate refunds |  |  |  |  |  | 425 |  |  |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Net realized and unrealized mark-to-market and hedging transactions |  |  |  |  |  | 22 | 18 | 34 |
Receivables |  |  |  |  |  | (345) | (83) | (372) |
Inventory |  |  |  |  |  | 156 | 268 | 272 |
Other current assets |  |  |  |  |  | (721) | (400) | (174) |
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | 479 | (204) | 296 |
Taxes accrued |  |  |  |  |  | 23 | 149 | 236 |
Other current liabilities |  |  |  |  |  | 270 | (482) | 182 |
Other assets |  |  |  |  |  | (1,008) | (436) | (186) |
Other liabilities |  |  |  |  |  | (39) | (60) | (137) |
Net cash provided by (used in) operating activities |  |  |  |  |  | 7,186 | 6,624 | 6,863 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | (9,389) | (8,052) | (7,901) |
Contributions to equity method investments |  |  |  |  |  | (416) | (414) | (307) |
Acquisitions, net of cash acquired |  |  |  |  |  |  | (13) | (4,778) |
Return of investment capital |  |  |  |  |  | 137 | 281 | 1 |
Purchases of debt and equity securities |  |  |  |  |  | (3,762) | (4,071) | (5,153) |
Proceeds from sales and maturities of debt and equity securities |  |  |  |  |  | 3,747 | 4,098 | 5,236 |
Proceeds from the sales of discontinued operations and other assets, net of cash divested |  |  |  |  |  | 41 |  | 1,418 |
Other |  |  |  |  |  | (418) | (271) | (44) |
Net cash used in investing activities |  |  |  |  |  | (10,060) | (8,442) | (11,528) |
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  | 5,299 | 6,909 | 9,238 |
Proceeds from Issuance of Common Stock |  |  |  |  |  | 1,838 |  | 731 |
Payments for the redemption of long-term debt |  |  |  |  |  | (2,906) | (2,316) | (1,923) |
Proceeds from the issuance of short-term debt with original maturities greater than 90 days |  |  |  |  |  | 472 | 319 | 2,081 |
Payments for the redemption of short-term debt with original maturities greater than 90 days |  |  |  |  |  | (282) | (272) | (2,166) |
Notes payable and commercial paper |  |  |  |  |  | 981 | (409) | (1,362) |
Dividends paid |  |  |  |  |  | (2,471) | (2,450) | (2,332) |
Other |  |  |  |  |  | 29 | 1 | (16) |
Net cash provided by financing activities |  |  |  |  |  | 2,960 | 1,782 | 4,251 |
Changes in cash and cash equivalents included in assets held for sale |  |  |  |  |  |  |  | 474 |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  |  | 86 | (36) | 60 |
Cash, cash equivalents, and restricted cash at beginning of period |  |  | 505 |  | 541 | 505 | 541 | 481 |
Cash, cash equivalents, and restricted cash at end of period | $ 541 | 591 |  | 505 |  | 591 | 505 | 541 |
Cash and cash equivalents at beginning of period |  |  | 358 |  |  | 358 |  |  |
Cash and cash equivalents at end of period |  | 442 |  | 358 |  | 442 | 358 |  |
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized |  |  |  |  |  | 2,086 | 1,963 | 1,794 |
Cash (received from) paid for income taxes |  |  |  |  |  | (266) | 4 | 229 |
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  | 1,112 | 1,032 | 1,000 |
Non-cash dividends |  |  |  |  |  | 107 |  |  |
Duke Energy Carolinas [Member] |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net Income Attributable to Parent |  | 135 | 323 | 205 | 270 | 1,071 | 1,214 | 1,166 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) |  |  |  |  |  | 1,487 | 1,409 | 1,382 |
Equity component of AFUDC |  |  |  |  |  | (73) | (106) | (102) |
Losses (Gains) on sales of other assets |  |  |  |  |  | 1 | (1) | 5 |
Impairment charges |  |  |  |  |  | 192 |  | 1 |
Deferred income taxes |  |  |  |  |  | 305 | 410 | 470 |
Accrued pension and other post-retirement benefit costs |  |  |  |  |  | 4 | (4) | 4 |
Contributions to qualified pension plans |  |  |  |  |  | (46) |  | (43) |
Payments for asset retirement obligations |  |  |  |  |  | (230) | (271) | (287) |
Provision for rate refunds |  |  |  |  |  | 182 |  |  |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Net realized and unrealized mark-to-market and hedging transactions |  |  |  |  |  | 2 | 9 | 5 |
Receivables |  |  |  |  |  | (86) | (9) | (76) |
Receivables from affiliated companies |  |  |  |  |  | (87) | 68 | (56) |
Inventory |  |  |  |  |  | 25 | 78 | 215 |
Other current assets |  |  |  |  |  | (161) | 7 | 67 |
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | 168 | 23 | (69) |
Accounts payable to affiliated companies |  |  |  |  |  | 21 | (38) | 18 |
Taxes accrued |  |  |  |  |  | (65) | 86 | 187 |
Other current liabilities |  |  |  |  |  | 89 | (161) | 63 |
Other assets |  |  |  |  |  | (179) | (49) | 20 |
Other liabilities |  |  |  |  |  | (90) | (31) | 6 |
Net cash provided by (used in) operating activities |  |  |  |  |  | 2,530 | 2,634 | 2,976 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | (2,706) | (2,524) | (2,220) |
Purchases of debt and equity securities |  |  |  |  |  | (1,810) | (2,124) | (2,832) |
Proceeds from sales and maturities of debt and equity securities |  |  |  |  |  | 1,810 | 2,128 | 2,832 |
Notes receivable from affiliated companies |  |  |  |  |  |  | 66 | 97 |
Other |  |  |  |  |  | (147) | (109) | (83) |
Net cash used in investing activities |  |  |  |  |  | (2,853) | (2,563) | (2,206) |
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  | 1,983 | 569 | 1,587 |
Payments for the redemption of long-term debt |  |  |  |  |  | (1,205) | (116) | (356) |
Notes payable to affiliated companies |  |  |  |  |  | 335 | 104 |  |
Distributions to parent |  |  |  |  |  | (750) | (625) | (2,000) |
Other |  |  |  |  |  | (23) | (1) |  |
Net cash provided by financing activities |  |  |  |  |  | 340 | (69) | (769) |
Net increase in cash and cash equivalents |  |  |  |  |  | 17 | 2 | 1 |
Cash and cash equivalents at beginning of period |  |  | 16 |  | 14 | 16 | 14 | 13 |
Cash and cash equivalents at end of period | 14 | 33 |  | 16 |  | 33 | 16 | 14 |
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized |  |  |  |  |  | 452 | 398 | 393 |
Cash (received from) paid for income taxes |  |  |  |  |  | 89 | 193 | (60) |
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  | 302 | 315 | 347 |
Progress Energy [Member] |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net income |  | 123 | 237 | 447 | 201 | 1,033 | 1,268 | 1,041 |
Net Income Attributable to Parent |  | 123 | 235 | 444 | 199 | 1,027 | 1,258 | 1,031 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) |  |  |  |  |  | 1,987 | 1,516 | 1,435 |
Equity component of AFUDC |  |  |  |  |  | (104) | (92) | (76) |
Losses (Gains) on sales of other assets |  |  |  |  |  | (24) | (28) | (34) |
Impairment charges |  |  |  |  |  | 87 | 156 | 7 |
Deferred income taxes |  |  |  |  |  | 358 | 703 | 532 |
Accrued pension and other post-retirement benefit costs |  |  |  |  |  | 24 | (28) | (24) |
Contributions to qualified pension plans |  |  |  |  |  | (45) |  | (43) |
Payments for asset retirement obligations |  |  |  |  |  | (230) | (248) | (270) |
Other rate case adjustments |  |  |  |  |  | 37 |  |  |
Provision for rate refunds |  |  |  |  |  | 122 |  |  |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Net realized and unrealized mark-to-market and hedging transactions |  |  |  |  |  | 18 |  | 42 |
Receivables |  |  |  |  |  | (207) | (89) | 7 |
Receivables from affiliated companies |  |  |  |  |  | (137) | 71 | 211 |
Inventory |  |  |  |  |  | 121 | 125 | 35 |
Other current assets |  |  |  |  |  | (12) | (397) | 50 |
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | 217 | (260) | 252 |
Accounts payable to affiliated companies |  |  |  |  |  | 109 | (97) | 37 |
Taxes accrued |  |  |  |  |  | 8 | 17 | 15 |
Other current liabilities |  |  |  |  |  | 129 | (166) | (42) |
Other assets |  |  |  |  |  | (913) | (300) | (248) |
Other liabilities |  |  |  |  |  | (34) | (98) | (36) |
Net cash provided by (used in) operating activities |  |  |  |  |  | 2,544 | 2,053 | 2,891 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | (3,854) | (3,152) | (3,306) |
Asset acquisitions |  |  |  |  |  |  |  | (10) |
Proceeds from the sales of other assets |  |  |  |  |  | 20 |  |  |
Purchases of debt and equity securities |  |  |  |  |  | (1,753) | (1,806) | (2,143) |
Proceeds from sales and maturities of debt and equity securities |  |  |  |  |  | 1,769 | 1,824 | 2,187 |
Proceeds from insurance |  |  |  |  |  |  | 7 | 58 |
Proceeds from the sale of nuclear fuel |  |  |  |  |  |  | 20 | 20 |
Notes receivable from affiliated companies |  |  |  |  |  | 240 | (160) | (80) |
Other |  |  |  |  |  | (182) | (86) | 47 |
Net cash used in investing activities |  |  |  |  |  | (3,760) | (3,353) | (3,227) |
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  | 1,833 | 2,118 | 2,375 |
Payments for the redemption of long-term debt |  |  |  |  |  | (771) | (813) | (327) |
Notes payable to affiliated companies |  |  |  |  |  | 430 | 100 | 444 |
Dividends to parent |  |  |  |  |  | (250) | (124) | (2,098) |
Other |  |  |  |  |  | (1) | (4) | (3) |
Net cash provided by financing activities |  |  |  |  |  | 1,241 | 1,277 | 391 |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  |  | 25 | (23) | 55 |
Cash, cash equivalents, and restricted cash at beginning of period |  |  | 87 |  | 110 | 87 | 110 | 55 |
Cash, cash equivalents, and restricted cash at end of period | 110 | 112 |  | 87 |  | 112 | 87 | 110 |
Cash and cash equivalents at beginning of period |  |  | 40 |  |  | 40 |  |  |
Cash and cash equivalents at end of period |  | 67 |  | 40 |  | 67 | 40 |  |
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized |  |  |  |  |  | 798 | 773 | 673 |
Cash (received from) paid for income taxes |  |  |  |  |  | (348) | (146) | (187) |
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  | 478 | 391 | 317 |
Equitization of certain notes payable to affiliates |  |  |  |  |  |  | 1,047 |  |
Dividend to parent related to a legal entity restructuring |  |  |  |  |  |  | 547 |  |
Duke Energy Progress [Member] |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net Income Attributable to Parent |  | 135 | 177 | 168 | 147 | 667 | 715 | 599 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) |  |  |  |  |  | 1,183 | 936 | 907 |
Equity component of AFUDC |  |  |  |  |  | (57) | (47) | (50) |
Losses (Gains) on sales of other assets |  |  |  |  |  | (9) | (5) | (6) |
Impairment charges |  |  |  |  |  | 33 | 19 | 1 |
Deferred income taxes |  |  |  |  |  | 236 | 384 | 384 |
Accrued pension and other post-retirement benefit costs |  |  |  |  |  | 15 | (20) | (32) |
Contributions to qualified pension plans |  |  |  |  |  | (25) |  | (24) |
Payments for asset retirement obligations |  |  |  |  |  | (195) | (192) | (212) |
Other rate case adjustments |  |  |  |  |  | 37 |  |  |
Provision for rate refunds |  |  |  |  |  | 122 |  |  |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Net realized and unrealized mark-to-market and hedging transactions |  |  |  |  |  | 5 | (4) | 4 |
Receivables |  |  |  |  |  | (107) | (58) | (17) |
Receivables from affiliated companies |  |  |  |  |  | (20) | 2 | 11 |
Inventory |  |  |  |  |  | 63 | 59 | 12 |
Other current assets |  |  |  |  |  | (201) | (75) | 84 |
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | 219 | (230) | 181 |
Accounts payable to affiliated companies |  |  |  |  |  | 99 | (48) | 37 |
Taxes accrued |  |  |  |  |  | (11) | (39) | 90 |
Other current liabilities |  |  |  |  |  | 46 | (131) | 114 |
Other assets |  |  |  |  |  | (484) | (53) | (163) |
Other liabilities |  |  |  |  |  | 12 | (18) | 12 |
Net cash provided by (used in) operating activities |  |  |  |  |  | 1,628 | 1,195 | 1,932 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | (2,220) | (1,715) | (1,733) |
Proceeds from the sales of other assets |  |  |  |  |  | 20 |  |  |
Purchases of debt and equity securities |  |  |  |  |  | (1,236) | (1,249) | (1,658) |
Proceeds from sales and maturities of debt and equity securities |  |  |  |  |  | 1,206 | 1,207 | 1,615 |
Proceeds from insurance |  |  |  |  |  |  | 4 |  |
Notes receivable from affiliated companies |  |  |  |  |  |  | 165 | (165) |
Other |  |  |  |  |  | (115) | (55) | 26 |
Net cash used in investing activities |  |  |  |  |  | (2,345) | (1,643) | (1,915) |
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  | 845 | 812 | 505 |
Payments for the redemption of long-term debt |  |  |  |  |  | (3) | (470) | (15) |
Notes payable to affiliated companies |  |  |  |  |  | 54 | 240 | (209) |
Distributions to parent |  |  |  |  |  | (175) | (124) | (300) |
Other |  |  |  |  |  | (1) | (1) | (2) |
Net cash provided by financing activities |  |  |  |  |  | 720 | 457 | (21) |
Net increase in cash and cash equivalents |  |  |  |  |  | 3 | 9 | (4) |
Cash and cash equivalents at beginning of period |  |  | 20 |  | 11 | 20 | 11 | 15 |
Cash and cash equivalents at end of period | 11 | 23 |  | 20 |  | 23 | 20 | 11 |
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized |  |  |  |  |  | 303 | 291 | 248 |
Cash (received from) paid for income taxes |  |  |  |  |  | (112) | 59 | (287) |
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  | 220 | 191 | 147 |
Duke Energy Florida [Member] |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net Income Attributable to Parent |  | 40 | 103 | 344 | 90 | 554 | 712 | 551 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) |  |  |  |  |  | 793 | 570 | 516 |
Equity component of AFUDC |  |  |  |  |  | (47) | (45) | (26) |
Losses (Gains) on sales of other assets |  |  |  |  |  | (1) | (1) |  |
Impairment charges |  |  |  |  |  | 54 | 138 | 6 |
Deferred income taxes |  |  |  |  |  | 159 | 245 | 224 |
Accrued pension and other post-retirement benefit costs |  |  |  |  |  | 5 | (13) | 2 |
Contributions to qualified pension plans |  |  |  |  |  | (20) |  | (20) |
Payments for asset retirement obligations |  |  |  |  |  | (35) | (56) | (58) |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Net realized and unrealized mark-to-market and hedging transactions |  |  |  |  |  | 7 | 5 | 38 |
Receivables |  |  |  |  |  | (100) | (38) | 23 |
Receivables from affiliated companies |  |  |  |  |  | (26) |  | 21 |
Inventory |  |  |  |  |  | 58 | 66 | 23 |
Other current assets |  |  |  |  |  | 59 | (138) | (86) |
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | (1) | (32) | 71 |
Accounts payable to affiliated companies |  |  |  |  |  | 17 | (51) | 9 |
Taxes accrued |  |  |  |  |  | 40 | 1 | (117) |
Other current liabilities |  |  |  |  |  | 82 | (37) | (149) |
Other assets |  |  |  |  |  | (428) | (229) | (84) |
Other liabilities |  |  |  |  |  | (61) | (82) | (53) |
Net cash provided by (used in) operating activities |  |  |  |  |  | 1,109 | 1,015 | 891 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | (1,634) | (1,437) | (1,583) |
Purchases of debt and equity securities |  |  |  |  |  | (517) | (557) | (485) |
Proceeds from sales and maturities of debt and equity securities |  |  |  |  |  | 563 | 617 | 572 |
Proceeds from insurance |  |  |  |  |  |  | 4 | 58 |
Proceeds from the sale of nuclear fuel |  |  |  |  |  |  | 20 | 20 |
Notes receivable from affiliated companies |  |  |  |  |  | 313 | (313) |  |
Other |  |  |  |  |  | (65) | (31) | 21 |
Net cash used in investing activities |  |  |  |  |  | (1,340) | (1,697) | (1,397) |
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  | 988 | 1,306 | 1,870 |
Payments for the redemption of long-term debt |  |  |  |  |  | (769) | (342) | (12) |
Notes payable to affiliated companies |  |  |  |  |  | 108 | (297) | (516) |
Distributions to parent |  |  |  |  |  | (75) |  | (775) |
Other |  |  |  |  |  | 1 | (1) |  |
Net cash provided by financing activities |  |  |  |  |  | 253 | 666 | 567 |
Net increase (decrease) in cash, cash equivalents, and restricted cash |  |  |  |  |  | 22 | (16) | 61 |
Cash, cash equivalents, and restricted cash at beginning of period |  |  | 53 |  | 69 | 53 | 69 | 8 |
Cash, cash equivalents, and restricted cash at end of period | 69 | 75 |  | 53 |  | 75 | 53 | 69 |
Cash and cash equivalents at beginning of period |  |  | 13 |  |  | 13 |  |  |
Cash and cash equivalents at end of period |  | 36 |  | 13 |  | 36 | 13 |  |
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized |  |  |  |  |  | 270 | 274 | 208 |
Cash (received from) paid for income taxes |  |  |  |  |  | (120) | (197) | 216 |
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  | 258 | 199 | 170 |
Duke Energy Ohio [Member] |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net Income Attributable to Parent |  | 55 | (25) | 65 | 42 | 176 | 192 | 228 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) |  |  |  |  |  | 271 | 265 | 237 |
Equity component of AFUDC |  |  |  |  |  | (11) | (11) | (6) |
Losses (Gains) on sales of other assets |  |  |  |  |  | 106 | (1) | (2) |
Impairment charges |  |  |  |  |  |  | 1 |  |
Deferred income taxes |  |  |  |  |  | 25 | 90 | 55 |
Accrued pension and other post-retirement benefit costs |  |  |  |  |  | 3 | 2 | 6 |
Contributions to qualified pension plans |  |  |  |  |  |  | (4) | (5) |
Payments for asset retirement obligations |  |  |  |  |  | (3) | (7) | (5) |
Provision for rate refunds |  |  |  |  |  | 24 |  |  |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Net realized and unrealized mark-to-market and hedging transactions |  |  |  |  |  |  |  | (2) |
Receivables |  |  |  |  |  | (33) | 2 | (4) |
Receivables from affiliated companies |  |  |  |  |  | 19 | (4) | (36) |
Inventory |  |  |  |  |  | 7 | 6 | (32) |
Other current assets |  |  |  |  |  | 16 | (22) | 79 |
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | (19) | 12 | 19 |
Accounts payable to affiliated companies |  |  |  |  |  | 16 | (1) | 10 |
Taxes accrued |  |  |  |  |  | 12 | 11 | 3 |
Other current liabilities |  |  |  |  |  | 14 | (19) | (54) |
Other assets |  |  |  |  |  | (26) | (28) | (35) |
Other liabilities |  |  |  |  |  | (27) | (5) | (31) |
Net cash provided by (used in) operating activities |  |  |  |  |  | 570 | 479 | 425 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | (827) | (686) | (476) |
Notes receivable from affiliated companies |  |  |  |  |  | 14 | 80 | (94) |
Other |  |  |  |  |  | (89) | (41) | (30) |
Net cash used in investing activities |  |  |  |  |  | (902) | (647) | (600) |
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  | 99 | 182 | 341 |
Payments for the redemption of long-term debt |  |  |  |  |  | (3) | (2) | (53) |
Notes payable to affiliated companies |  |  |  |  |  | 245 | 13 | (87) |
Capital contribution from parent |  |  |  |  |  | 106 |  |  |
Dividends to parent |  |  |  |  |  |  | (25) | (25) |
Other |  |  |  |  |  |  | (1) | (2) |
Net cash provided by financing activities |  |  |  |  |  | 341 | 167 | 174 |
Net increase in cash and cash equivalents |  |  |  |  |  | 9 | (1) | (1) |
Cash and cash equivalents at beginning of period |  |  | 12 |  | 13 | 12 | 13 | 14 |
Cash and cash equivalents at end of period | 13 | 21 |  | 12 |  | 21 | 12 | 13 |
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized |  |  |  |  |  | 87 | 85 | 81 |
Cash (received from) paid for income taxes |  |  |  |  |  | (6) | (8) | (46) |
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  | 95 | 82 | 83 |
Transfer of ownership interest of certain equity method investees to parent |  |  |  |  |  | 106 |  |  |
Duke Energy Indiana [Member] |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net Income Attributable to Parent |  | 76 | 100 | 36 | 91 | 393 | 354 | 381 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) |  |  |  |  |  | 524 | 462 | 499 |
Equity component of AFUDC |  |  |  |  |  | (32) | (28) | (16) |
Impairment charges |  |  |  |  |  | 30 | 18 | 8 |
Deferred income taxes |  |  |  |  |  | 95 | 152 | 213 |
Accrued pension and other post-retirement benefit costs |  |  |  |  |  | 7 | 2 | 8 |
Contributions to qualified pension plans |  |  |  |  |  | (8) |  | (9) |
Payments for asset retirement obligations |  |  |  |  |  | (69) | (45) | (46) |
Provision for rate refunds |  |  |  |  |  | 53 |  |  |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Receivables |  |  |  |  |  | 7 | 59 | (2) |
Receivables from affiliated companies |  |  |  |  |  | 3 | (11) | (43) |
Inventory |  |  |  |  |  | 28 | 54 | 66 |
Other current assets |  |  |  |  |  | (25) | 28 | (67) |
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable |  |  |  |  |  | 37 | (86) | 8 |
Accounts payable to affiliated companies |  |  |  |  |  | 5 | 4 | (9) |
Taxes accrued |  |  |  |  |  | (52) | 64 | (4) |
Other current liabilities |  |  |  |  |  | 14 | (10) | (81) |
Other assets |  |  |  |  |  | 29 | (28) | (27) |
Other liabilities |  |  |  |  |  | (33) | (20) | (8) |
Net cash provided by (used in) operating activities |  |  |  |  |  | 1,006 | 969 | 871 |
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  | (832) | (840) | (755) |
Purchases of debt and equity securities |  |  |  |  |  | (48) | (20) | (14) |
Proceeds from sales and maturities of debt and equity securities |  |  |  |  |  | 44 | 7 | 11 |
Proceeds from the sales of discontinued operations and other assets, net of cash divested |  |  |  |  |  | 15 |  |  |
Notes receivable from affiliated companies |  |  |  |  |  |  | 86 | (3) |
Other |  |  |  |  |  | 3 | (65) | 32 |
Net cash used in investing activities |  |  |  |  |  | (818) | (832) | (729) |
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  |  |  | 494 |
Payments for the redemption of long-term debt |  |  |  |  |  | (3) | (5) | (478) |
Notes payable to affiliated companies |  |  |  |  |  | 6 | 161 |  |
Distributions to parent |  |  |  |  |  | (175) | (300) | (149) |
Other |  |  |  |  |  | (1) | (1) | (1) |
Net cash provided by financing activities |  |  |  |  |  | (173) | (145) | (134) |
Net increase in cash and cash equivalents |  |  |  |  |  | 15 | (8) | 8 |
Cash and cash equivalents at beginning of period |  |  | 9 |  | 17 | 9 | 17 | 9 |
Cash and cash equivalents at end of period | 17 | 24 |  | 9 |  | 24 | 9 | 17 |
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized |  |  |  |  |  | 162 | 179 | 171 |
Cash (received from) paid for income taxes |  |  |  |  |  | 75 | 117 | (7) |
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures |  |  |  |  |  | 88 | 125 | 99 |
Piedmont Natural Gas [Member] |  |  |  |  |  |  |  |  |
CASH FLOWS FROM OPERATING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Net Income Attributable to Parent | 54 | 48 | 110 | 63 | 95 | 129 | 139 |  | $ 193
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |  |  |  |  |
Depreciation, amortization and accretion (including amortization of nuclear fuel) | 25 |  |  |  |  | 161 | 151 |  | 148
Losses (Gains) on sales of other assets |  |  |  |  |  |  |  |  | (133)
Impairment charges |  |  |  |  |  |  | 7 |  |
Deferred income taxes | 26 |  |  |  |  | (31) | 154 |  | 74
Equity in (earnings) losses of unconsolidated affiliates | (2) |  |  |  |  | (7) | 6 |  | (29)
Accrued pension and other post-retirement benefit costs | 5 |  |  |  |  | (4) | 23 |  | 3
Contributions to qualified pension plans | (10) |  |  |  |  |  | (11) |  | (14)
Payments for asset retirement obligations | (1) |  |  |  |  |  |  |  | (6)
Provision for rate refunds |  |  |  |  |  | 43 |  |  |
(Increase) decrease in |  |  |  |  |  |  |  |  |
Receivables | (157) |  |  |  |  | 7 | (40) |  | 12
Receivables from affiliated companies |  |  |  |  |  | (15) |  |  | (7)
Inventory | (11) |  |  |  |  | (4) |  |  | 14
Other current assets | 8 |  |  |  |  | 71 | (20) |  | (98)
Increase (decrease) in |  |  |  |  |  |  |  |  |
Accounts payable | 35 |  |  |  |  | 15 | (13) |  | 6
Accounts payable to affiliated companies | 4 |  |  |  |  | 25 | 5 |  | 6
Taxes accrued | (2) |  |  |  |  | 65 | (48) |  | 38
Other current liabilities | 2 |  |  |  |  | 21 | (9) |  | 28
Other assets | (7) |  |  |  |  | 6 | 7 |  | (91)
Other liabilities | 5 |  |  |  |  | (4) | (2) |  | 180
Net cash provided by (used in) operating activities | (26) |  |  |  |  | 478 | 349 |  | 324
CASH FLOWS FROM INVESTING ACTIVITIES |  |  |  |  |  |  |  |  |
Capital expenditures | (113) |  |  |  |  | (721) | (585) |  | (522)
Contributions to equity method investments | (12) |  |  |  |  |  | (12) |  | (47)
Proceeds from the sales of other assets |  |  |  |  |  |  |  |  | 175
Return of investment capital | 1 |  |  |  |  | 3 | 2 |  | 18
Other | 1 |  |  |  |  | (10) | (6) |  | 5
Net cash used in investing activities | (124) |  |  |  |  | (731) | (603) |  | (389)
CASH FLOWS FROM FINANCING ACTIVITIES [Abstract] |  |  |  |  |  |  |  |  |
Proceeds from the issuance of long-term debt |  |  |  |  |  | 100 | 250 |  | 295
Proceeds from Issuance of Common Stock |  |  |  |  |  |  |  |  | 122
Payments for the redemption of long-term debt |  |  |  |  |  |  | (35) |  | (40)
Notes payable and commercial paper | 185 |  |  |  |  |  | (330) |  | (195)
Notes payable to affiliated companies |  |  |  |  |  | (166) | 364 |  |
Capital contribution from parent |  |  |  |  |  | 300 |  |  |
Dividends to parent | (27) |  |  |  |  |  |  |  |
Dividends paid |  |  |  |  |  |  |  |  | (114)
Other |  |  |  |  |  |  | (1) |  |
Net cash provided by financing activities | 158 |  |  |  |  | 234 | 248 |  | 68
Net increase in cash and cash equivalents | 8 |  |  |  |  | (19) | (6) |  | 3
Cash and cash equivalents at beginning of period | 17 |  | $ 19 |  | $ 25 | 19 | 25 |  | 14
Cash and cash equivalents at end of period | 25 | $ 0 |  | $ 19 |  | 0 | 19 | $ 25 | 17
Supplemental Disclosures: |  |  |  |  |  |  |  |  |
Cash paid for interest, net of amount capitalized | 11 |  |  |  |  | 79 | 78 |  | 81
Cash (received from) paid for income taxes |  |  |  |  |  | (16) | (12) |  | (25)
Significant non-cash transactions: |  |  |  |  |  |  |  |  |
Accrued capital expenditures | $ 48 |  |  |  |  | $ 96 | 34 |  | $ 63
Transfer of ownership interest of certain equity method investees to parent |  |  |  |  |  |  | $ 149 |  |

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