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v3.20.2

Fair Value Measurements (Gains and Losses on Available-for-sale Debt Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Realized Gains | $ 30 | $ 21 | $ 86 | $ 47 |
Realized Losses | 17 | 14 | 50 | 34 |
Proceeds from sale or maturity of securities | 555 | 612 | 2,046 | 2,087 |
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized gains | 120 |  | 120 |  | $ 75
Unrealized losses | 23 |  | 23 |  | 7
Fair value | 314 |  | 314 |  | 314
FPL [Member] | Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Realized Gains | 21 | 15 | 66 | 30 |
Realized Losses | 10 | 11 | 38 | 20 |
Proceeds from sale or maturity of securities | 475 | $ 489 | 1,747 | $ 1,717 |
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Unrealized gains | 92 |  | 92 |  | 58
Unrealized losses | 21 |  | 21 |  | 7
Fair value | $ 239 |  | $ 239 |  | $ 240

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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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