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Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 5,091 | $ 4,854 |
Other intangible assets not subject to amortization, primarily land easements | 136 | 136 |
Other intangible assets: |  |  |
Total | 1,706 | 722 |
Accumulated amortization | (150) | (99) |
Total other intangible assets subject to amortization - net | 1,556 | 623 |
Intangible assets, amortization [Abstract] |  |  |
Amortization expense | 58 | 18 | $ 25
Amortization Expense Year 1 | 57 |  |
Amortization Expense Year 2 | 51 |  |
Amortization Expense Year 3 | 49 |  |
Amortization Expense Year 4 | 47 |  |
Amortization Expense Year 5 | $ 45 |  |
Purchased Power Agreements [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 10 years |  |
Total | $ 988 | 549 |
Biogas Rights Agreements |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 30 years |  |
Total | $ 531 | 0 |
Other, primarily transportation contracts and customer lists [Member] |  |  |
Other intangible assets: |  |  |
Weighted average useful lives (years) | 24 years |  |
Total | $ 187 | 173 |
Rate-Regulated Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 1,218 | 1,218 |
Gas Infrastructure [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 487 | 487 |
Clean Energy Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 315 | 54 |
Customer Supply [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 95 | 95 |
Other Goodwill Assets [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill |  | 11 |
Corporate and Other [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | 11 |  |
FPL [Member] |  |  |
Goodwill and Intangible Assets [Line Items] |  |  |
Goodwill | $ 2,965 | $ 2,989 |

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