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Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | $ 347 | $ 286
Lease obligations | 346 | 515
Pension, post-retirement and other employee benefits | 207 | 236
Progress Energy merger purchase accounting adjustments | 340 | 441
Tax credits and NOL carryforwards | 3,784 | 3,909
Other | 85 | 93
Valuation allowance | (518) | (586)
Total deferred income tax assets | 4,591 | 4,894
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (2,428) | (2,267)
Accelerated depreciation rates | (10,391) | (10,729)
Regulatory assets and deferred debits, net | (1,151) | (1,142)
Total deferred income tax liabilities | (13,970) | (14,138)
Net deferred income tax liabilities | (9,379) | (9,244)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 3,784 | 3,909
Valuation allowance | 518 | 586
General Business Credits |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 2,312 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 2,312 |
NOL Carryforwards | Federal |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 4 |
Valuation allowance | (4) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 4 |
Valuation allowance | 4 |
NOL Carryforwards | State |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 328 |
Valuation allowance | (112) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 328 |
Valuation allowance | 112 |
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 |
Foreign Tax Credit |  |
Deferred Tax Assets, Gross [Abstract] |  |
Valuation allowance | (390) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Valuation allowance | 390 |
Foreign Tax Credit | Foreign |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 1,128 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 1,128 |
Duke Energy Carolinas |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 121 | 85
Lease obligations | 91 | 96
Pension, post-retirement and other employee benefits | (36) | (30)
Tax credits and NOL carryforwards | 349 | 285
Regulatory liabilities and deferred credits | 11 | 11
Other | 12 | 8
Total deferred income tax assets | 548 | 455
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (1,205) | (1,127)
Accelerated depreciation rates | (2,977) | (3,170)
Total deferred income tax liabilities | (4,182) | (4,297)
Net deferred income tax liabilities | (3,634) | (3,842)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 349 | 285
Progress Energy |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 101 | 87
Lease obligations | 197 | 208
Pension, post-retirement and other employee benefits | 30 | 68
Tax credits and NOL carryforwards | 497 | 508
Other | 12 | 14
Total deferred income tax assets | 837 | 885
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (742) | (669)
Accelerated depreciation rates | (3,891) | (3,868)
Regulatory assets and deferred debits, net | (768) | (744)
Total deferred income tax liabilities | (5,401) | (5,281)
Net deferred income tax liabilities | (4,564) | (4,396)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 497 | 508
Duke Energy Progress |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 60 | 67
Lease obligations | 121 | 120
Pension, post-retirement and other employee benefits | 17 | 24
Tax credits and NOL carryforwards | 160 | 179
Other | 7 | 9
Total deferred income tax assets | 365 | 399
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (610) | (507)
Accelerated depreciation rates | (1,546) | (1,778)
Regulatory assets and deferred debits, net | (417) | (412)
Total deferred income tax liabilities | (2,573) | (2,697)
Net deferred income tax liabilities | (2,208) | (2,298)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 160 | 179
Duke Energy Florida |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 40 | 18
Lease obligations | 76 | 87
Pension, post-retirement and other employee benefits | 7 | 38
Tax credits and NOL carryforwards | 306 | 282
Other | 4 | 4
Total deferred income tax assets | 433 | 429
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (135) | (164)
Accelerated depreciation rates | (2,382) | (2,124)
Regulatory assets and deferred debits, net | (350) | (332)
Total deferred income tax liabilities | (2,867) | (2,620)
Net deferred income tax liabilities | (2,434) | (2,191)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 306 | 282
Duke Energy Ohio |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 19 | 21
Lease obligations | 4 | 5
Pension, post-retirement and other employee benefits | 11 | 16
Tax credits and NOL carryforwards | 13 | 16
Regulatory liabilities and deferred credits | 16 | 18
Investments and other assets | 5 | 7
Other | 7 | 7
Total deferred income tax assets | 75 | 90
Deferred Tax Liabilities, Gross [Abstract] |  |
Accelerated depreciation rates | (1,125) | (1,071)
Total deferred income tax liabilities | (1,125) | (1,071)
Net deferred income tax liabilities | (1,050) | (981)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 13 | 16
Duke Energy Indiana |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 7 | 7
Lease obligations | 16 | 16
Pension, post-retirement and other employee benefits | 20 | 26
Tax credits and NOL carryforwards | 195 | 183
Investments and other assets | 6 |
Other | 2 | 1
Total deferred income tax assets | 246 | 233
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets |  | (14)
Accelerated depreciation rates | (1,496) | (1,433)
Regulatory assets and deferred debits, net | (53) | (14)
Total deferred income tax liabilities | (1,549) | (1,461)
Net deferred income tax liabilities | (1,303) | (1,228)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 195 | 183
Piedmont |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 18 | 38
Lease obligations | 4 | 5
Pension, post-retirement and other employee benefits | (8) | (5)
Tax credits and NOL carryforwards | 29 | 29
Regulatory liabilities and deferred credits | 6 |
Other | 8 | 8
Total deferred income tax assets | 57 | 75
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (39) | (48)
Accelerated depreciation rates | (833) | (844)
Regulatory assets and deferred debits, net |  | (4)
Total deferred income tax liabilities | (872) | (896)
Net deferred income tax liabilities | (815) | (821)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | $ 29 | $ 29

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