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Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 4,254 | $ 4,204 |
Other intangible assets not subject to amortization, primarily land easements | 135 | 135 |
Other intangible assets: |  |  |
Total | 619 | 473 |
Accumulated amortization | (61) | (56) |
Total other intangible assets subject to amortization - net | 558 | 417 |
Intangible assets, amortization [Abstract] |  |  |
Amortization expense | 27 | 18 | $ 19
Amortization Expense 2021 | 32 |  |
Amortization Expense 2022 | 17 |  |
Amortization Expense 2023 | 16 |  |
Amortization Expense 2024 | 18 |  |
Amortization Expense 2025 | $ 17 |  |
Purchased Power Agreements [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 14 years |  |
Total | $ 453 | 401 |
Other, primarily transmission and development rights and customer lists [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 17 years |  |
Total | $ 166 | 72 |
Rate-Regulated Transmission [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 614 | 610 |
Gas Infrastructure, primarily Texas pipelines [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 487 | 487 |
Customer Supply [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 93 | 93 |
Generation Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 60 | 28 |
Other Goodwill Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 11 | 0 |
FPL[Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 301 | 300 |
FPL[Member] | Florida City Gas [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 292 | 291 |
FPL[Member] | Other Goodwill Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 9 | 9 |
Gulf Power [Member] | Other Goodwill Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 2,688 | $ 2,686 |

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