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v3.10.0.1

Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  | $ 164 | $ 143
Capital lease obligations |  | 60 | 49
Pension, postretirement and other employee benefits |  | 347 | 295
Progress Energy merger purchase accounting adjustments |  | 483 | 536
Tax credits and NOL carryforwards |  | 4,580 | 4,527
Other |  | 25 | 73
Valuation allowance |  | (484) | (519)
Total deferred income tax assets |  | 5,175 | 5,104
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Investments and other assets |  | (1,317) | (1,419)
Accelerated depreciation rates |  | (10,124) | (9,216)
Regulatory assets and deferred debits, net |  | (1,540) | (1,090)
Total deferred income tax liabilities |  | (12,981) | (11,725)
Net deferred income tax liabilities |  | (7,806) | (6,621)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 4,580 | 4,527
Valuation allowance |  | (484) | (519)
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | $ (7,806) | (6,621)
State [Member] | Tax Year 2019 [Member] | North Carolina Department of Revenue [Member] |  |  |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Statutory Tax Rate |  | 2.50% |
Net reduction in deferred tax liability | $ 55 |  |
Investment Tax Credits [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Tax credits and NOL carryforwards |  | $ 1,614 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 1,614 |
Alternative Minimum Tax Credit [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 574 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 574 |
NOL Carryforwards [Member] | Federal [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 788 |
Valuation allowance |  | (4) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 788 |
Valuation allowance |  | (4) |
NOL Carryforwards [Member] | State [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 301 |
Valuation allowance |  | (85) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 301 |
Valuation allowance |  | (85) |
NOL Carryforwards [Member] | Foreign Jurisdictions [Member] |  |  |
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 [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 1,271 |
Valuation allowance |  | (383) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 1,271 |
Valuation allowance |  | (383) |
Charitable contribution carryforwards [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 20 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 20 |
Duke Energy Carolinas [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  | 64 | 33
Capital lease obligations |  | 26 | 14
Pension, postretirement and other employee benefits |  | 24 | (17)
Tax credits and NOL carryforwards |  | 257 | 234
Regulatory liabilities and deferred credits |  |  | 222
Other |  | 6 | 10
Total deferred income tax assets |  | 377 | 496
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Investments and other assets |  | (795) | (849)
Accelerated depreciation rates |  | (3,207) | (3,060)
Regulatory assets and deferred debits, net |  | (64) |
Total deferred income tax liabilities |  | (4,066) | (3,909)
Net deferred income tax liabilities |  | (3,689) | (3,413)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 257 | 234
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | (3,689) | (3,413)
Progress Energy [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  | 35 | 78
Pension, postretirement and other employee benefits |  | 110 | 111
Tax credits and NOL carryforwards |  | 693 | 402
Other |  | 5 | 1
Valuation allowance |  |  | (14)
Total deferred income tax assets |  | 843 | 578
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Investments and other assets |  | (430) | (470)
Accelerated depreciation rates |  | (3,369) | (2,803)
Regulatory assets and deferred debits, net |  | (985) | (807)
Total deferred income tax liabilities |  | (4,784) | (4,080)
Net deferred income tax liabilities |  | (3,941) | (3,502)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 693 | 402
Valuation allowance |  |  | (14)
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | (3,941) | (3,502)
Duke Energy Progress [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  | 53 | 23
Pension, postretirement and other employee benefits |  | 47 | 44
Tax credits and NOL carryforwards |  | 215 | 156
Other |  | 5 | 4
Total deferred income tax assets |  | 320 | 227
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Investments and other assets |  | (272) | (289)
Accelerated depreciation rates |  | (1,735) | (1,583)
Regulatory assets and deferred debits, net |  | (432) | (238)
Total deferred income tax liabilities |  | (2,439) | (2,110)
Net deferred income tax liabilities |  | (2,119) | (1,883)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 215 | 156
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | (2,119) | (1,883)
Duke Energy Florida [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  |  | 49
Pension, postretirement and other employee benefits |  | 58 | 60
Tax credits and NOL carryforwards |  | 363 | 143
Total deferred income tax assets |  | 421 | 252
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Investments and other assets |  | (163) | (187)
Accelerated depreciation rates |  | (1,670) | (1,257)
Regulatory assets and deferred debits, net |  | (574) | (569)
Total deferred income tax liabilities |  | (2,407) | (2,013)
Net deferred income tax liabilities |  | (1,986) | (1,761)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 363 | 143
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | (1,986) | (1,761)
Duke Energy Ohio [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  | 17 | 11
Pension, postretirement and other employee benefits |  | 16 | 14
Tax credits and NOL carryforwards |  | 42 | 25
Regulatory liabilities and deferred credits |  | 56 | 65
Investments and other assets |  | 18 |
Other |  | 1 |
Total deferred income tax assets |  | 150 | 115
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Accelerated depreciation rates |  | (967) | (896)
Total deferred income tax liabilities |  | (967) | (896)
Net deferred income tax liabilities |  | (817) | (781)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 42 | 25
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | (817) | (781)
Duke Energy Indiana [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  | 6 | 6
Capital lease obligations |  | 2 | 2
Pension, postretirement and other employee benefits |  | 24 | 18
Tax credits and NOL carryforwards |  | 237 | 216
Investments and other assets |  |  | 1
Other |  | (1) |
Total deferred income tax assets |  | 268 | 243
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Investments and other assets |  | (5) | (14)
Accelerated depreciation rates |  | (1,081) | (966)
Regulatory assets and deferred debits, net |  | (191) | (188)
Total deferred income tax liabilities |  | (1,277) | (1,168)
Net deferred income tax liabilities |  | (1,009) | (925)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 237 | 216
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | (1,009) | (925)
Piedmont Natural Gas [Member] |  |  |
Deferred Tax Assets, Gross [Abstract] |  |  |
Deferred credits and other liabilities |  | 17 | (5)
Pension, postretirement and other employee benefits |  | (1) | (4)
Tax credits and NOL carryforwards |  | 110 | 70
Regulatory liabilities and deferred credits |  | 48 | 61
Investments and other assets |  | 16 | 18
Total deferred income tax assets |  | 190 | 140
Deferred Tax Liabilities, Gross [Abstract] |  |  |
Accelerated depreciation rates |  | (733) | (697)
Other |  | (8) | (7)
Total deferred income tax liabilities |  | (741) | (704)
Net deferred income tax liabilities |  | (551) | (564)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |  |
Tax credits and NOL carryforwards |  | 110 | 70
Classification of Deferred Tax Assets (Liabiliities) in the Consolidated Balance Sheets [Abstract] |  |  |
Net deferred income tax liabilities |  | $ (551) | $ (564)

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