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Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 4,204 | $ 891 |
Other intangible assets not subject to amortization, primarily land easements | 135 | 135 |
Other intangible assets: |  |  |
Total | 473 | 659 |
Accumulated amortization | (56) | (86) |
Total other intangible assets subject to amortization - net | 417 | 573 |
Intangible assets, amortization [Abstract] |  |  |
Amortization expense | 18 | 19 | $ 35
Amortization Expense 2020 | 18 |  |
Amortization Expense 2021 | 14 |  |
Amortization Expense 2022 | 8 |  |
Amortization Expense 2023 | 7 |  |
Amortization Expense 2024 | $ 4 |  |
Purchased Power Agreements [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 17 years |  |
Total | $ 401 | 625 |
Other, primarily transmission and development rights and customer lists [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 22 years |  |
Total | $ 72 | 34 |
Rate-Regulated Transmission [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 610 | 0 |
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 | 72 |
Generation Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 28 | 28 |
Other Goodwill Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 2,686 | 0 |
FPL[Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 300 | 302 |
FPL[Member] | Florida City Gas [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 291 | 293 |
FPL[Member] | Other Goodwill Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 9 | $ 11 |

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