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Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | $ 286 | $ 125
Lease obligations | 515 | 462
Pension, post-retirement and other employee benefits | 236 | 303
Progress Energy merger purchase accounting adjustments | 441 | 389
Tax credits and NOL carryforwards | 3,909 | 3,925
Other | 93 | 97
Valuation allowance | (586) | (587)
Total deferred income tax assets | 4,894 | 4,714
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (2,267) | (1,664)
Accelerated depreciation rates | (10,729) | (10,813)
Regulatory assets and deferred debits, net | (1,142) | (1,115)
Total deferred income tax liabilities | (14,138) | (13,592)
Net deferred income tax liabilities | (9,244) | (8,878)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 3,909 | 3,925
Valuation allowance | 586 | 587
General Business Credits |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 2,033 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 2,033 |
NOL Carryforwards | Federal |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 154 |
Valuation allowance | (4) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 154 |
Valuation allowance | 4 |
NOL Carryforwards | State |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 340 |
Valuation allowance | (97) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 340 |
Valuation allowance | 97 |
NOL Carryforwards | Foreign |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 12 |
Valuation allowance | (12) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 12 |
Valuation allowance | 12 |
Capital loss carryforwards | Federal |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 85 |
Valuation allowance | (85) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 85 |
Valuation allowance | 85 |
Foreign Tax Credit |  |
Deferred Tax Assets, Gross [Abstract] |  |
Valuation allowance | (388) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Valuation allowance | 388 |
Foreign Tax Credit | Foreign |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 1,272 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 1,272 |
Charitable contribution carryforwards |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 13 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 13 |
Duke Energy Carolinas |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 85 | 24
Lease obligations | 96 | 72
Pension, post-retirement and other employee benefits | (30) | (5)
Tax credits and NOL carryforwards | 285 | 262
Regulatory liabilities and deferred credits | 11 |
Other | 8 | 5
Total deferred income tax assets | 455 | 358
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (1,127) | (981)
Accelerated depreciation rates | (3,170) | (3,254)
Regulatory assets and deferred debits, net |  | (44)
Total deferred income tax liabilities | (4,297) | (4,279)
Net deferred income tax liabilities | (3,842) | (3,921)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 285 | 262
Progress Energy |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 87 | 25
Lease obligations | 208 | 193
Pension, post-retirement and other employee benefits | 68 | 88
Tax credits and NOL carryforwards | 508 | 486
Other | 14 | 8
Total deferred income tax assets | 885 | 800
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (669) | (577)
Accelerated depreciation rates | (3,868) | (3,798)
Regulatory assets and deferred debits, net | (744) | (887)
Total deferred income tax liabilities | (5,281) | (5,262)
Net deferred income tax liabilities | (4,396) | (4,462)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 508 | 486
Duke Energy Progress |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 67 | 49
Lease obligations | 120 | 92
Pension, post-retirement and other employee benefits | 24 | 38
Tax credits and NOL carryforwards | 179 | 176
Other | 9 | 3
Total deferred income tax assets | 399 | 358
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (507) | (390)
Accelerated depreciation rates | (1,778) | (1,918)
Regulatory assets and deferred debits, net | (412) | (438)
Total deferred income tax liabilities | (2,697) | (2,746)
Net deferred income tax liabilities | (2,298) | (2,388)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 179 | 176
Duke Energy Florida |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 18 |
Lease obligations | 87 | 102
Pension, post-retirement and other employee benefits | 38 | 44
Tax credits and NOL carryforwards | 282 | 253
Other | 4 | 2
Total deferred income tax assets | 429 | 401
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (164) | (190)
Accelerated depreciation rates | (2,124) | (1,913)
Regulatory assets and deferred debits, net | (332) | (477)
Total deferred income tax liabilities | (2,620) | (2,580)
Net deferred income tax liabilities | (2,191) | (2,179)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 282 | 253
Duke Energy Ohio |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 21 | 14
Lease obligations | 5 | 5
Pension, post-retirement and other employee benefits | 16 | 17
Tax credits and NOL carryforwards | 16 | 16
Regulatory liabilities and deferred credits | 18 | 36
Investments and other assets | 7 | 10
Other | 7 | 8
Total deferred income tax assets | 90 | 106
Deferred Tax Liabilities, Gross [Abstract] |  |
Accelerated depreciation rates | (1,071) | (1,028)
Total deferred income tax liabilities | (1,071) | (1,028)
Net deferred income tax liabilities | (981) | (922)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 16 | 16
Duke Energy Indiana |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 7 | 5
Lease obligations | 16 | 17
Pension, post-retirement and other employee benefits | 26 | 27
Tax credits and NOL carryforwards | 183 | 176
Regulatory liabilities and deferred credits | 0 | 52
Investments and other assets |  |
Other | 1 | 1
Total deferred income tax assets | 233 | 278
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (14) | (12)
Accelerated depreciation rates | (1,433) | (1,416)
Regulatory assets and deferred debits, net | (14) |
Total deferred income tax liabilities | (1,461) | (1,428)
Net deferred income tax liabilities | (1,228) | (1,150)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 183 | 176
Piedmont |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 38 | 22
Lease obligations | 5 | 6
Pension, post-retirement and other employee benefits | (5) | (3)
Tax credits and NOL carryforwards | 29 | 19
Regulatory liabilities and deferred credits |  | 42
Investments and other assets |  | 2
Other | 8 | 6
Total deferred income tax assets | 75 | 94
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (48) |
Accelerated depreciation rates | (844) | (802)
Regulatory assets and deferred debits, net | (4) |
Total deferred income tax liabilities | (896) | (802)
Net deferred income tax liabilities | (821) | (708)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | $ 29 | $ 19

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