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Acquisitions (Details) $ in Millions |  |  |  | 1 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 29, 2020 USD ($) utlity state mi | Jul. 16, 2019 USD ($) mi | Jan. 01, 2019 USD ($) county customer mi MW | Dec. 31, 2018 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill |  |  |  |  | $ 4,214 | $ 4,204
NextEra Energy Capital Holdings, Inc. (Consolidated) [Member] | Term Loan Agreements [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Borrowings |  |  |  | $ 4,500 |  |
Trans Bay Cable, LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of miles of power lines | mi |  | 53 |  |  |  |
Gulf Power [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash purchase price |  |  | $ 4,440 |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt |  |  | 1,300 |  |  |
Assets assumed |  |  | 5,200 |  |  |
Property, plant and equipment |  |  | 4,000 |  |  |
Regulatory assets |  |  | 494 |  |  |
Assumed liabilities |  |  | 3,400 |  |  |
Regulatory liabilities |  |  | 635 |  |  |
Deferred income taxes |  |  | 562 |  |  |
Goodwill |  |  | $ 2,700 |  |  |
Gulf Power [Member] | Gulf Power [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of customers acquired (more than) | customer |  |  | 470,000 |  |  |
Number of counties in which entity operates | county |  |  | 8 |  |  |
Number of miles of power lines | mi |  |  | 9,500 |  |  |
Electric generating facility capacity (in megawatts) | MW |  |  | 2,300 |  |  |
Trans Bay Cable, LLC [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Assets assumed |  | $ 703 |  |  |  |
Assumed liabilities |  | 643 |  |  |  |
Goodwill |  | 610 |  |  |  |
Goodwill, Expected Tax Deductible Amount |  |  |  |  | $ 572 |
Trans Bay Cable, LLC [Member] | NextEra Energy Transmission, LLC Subsidiary [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash purchase price |  | 670 |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, noncurrent liabilities, long-term debt |  | $ 422 |  |  |  |
GridLiance [Member] | NextEra Energy Transmission, LLC Subsidiary [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of miles of power lines | mi | 700 |  |  |  |  |
Consideration transferred | $ 660 |  |  |  |  |
Debt assumed | $ 160 |  |  |  |  |
Number of FERC-r transmission utilities | utlity | 3 |  |  |  |  |
Number of states in which entity operates | state | 6 |  |  |  |  |
GridLiance [Member] | NextEra Energy Transmission, LLC Subsidiary [Member] | Midwest And Nevada [Member] |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Number of states in which entity operates | state | 5 |  |  |  |  |

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