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Non-Derivative Fair Value Measurements (Gains and Losses on Available-for-sale Debt Securities) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2021
Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Realized Gains | $ 8 | $ 18 |
Realized Losses | 27 | 14 |
Proceeds from sale or maturity of securities | 721 | 548 |
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Unrealized gains | 16 |  | $ 76
Unrealized losses | 115 |  | 19
Fair value | 2,039 |  | 1,100
Florida Power & Light Company | Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Realized Gains | 7 | 12 |
Realized Losses | 19 | 13 |
Proceeds from sale or maturity of securities | 418 | $ 390 |
Florida Power & Light Company | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |
Unrealized gains | 13 |  | 63
Unrealized losses | 78 |  | 15
Fair value | $ 1,394 |  | $ 857

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