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Fair Value Measurements (Gains and Losses on Available-for-sale Debt Securities) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Realized Gains | $ 21 | $ 5 | $ 47 | $ 32 |
Realized Losses | 14 | 9 | 34 | 49 |
Proceeds from sale or maturity of securities | 612 | 576 | 2,087 | 1,889 |
Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 88 |  | 88 |  | $ 14
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 9 |  | 9 |  | 52
Fair value of available for sale securities in an unrealized loss position | 264 |  | 264 |  | 1,273
FPL [Member] | Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Realized Gains | 15 | 2 | 30 | 22 |
Realized Losses | 11 | 5 | 20 | 34 |
Proceeds from sale or maturity of securities | 489 | $ 487 | 1,717 | $ 1,529 |
FPL [Member] | Available for sale securities: Special Use Funds - Debt Securities [Member] |  |  |  |  |
Marketable Securities, Available-for-sale [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 68 |  | 68 |  | 11
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 8 |  | 8 |  | 41
Fair value of available for sale securities in an unrealized loss position | $ 191 |  | $ 191 |  | $ 961

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- Definition Amount, before tax, of unrealized gain 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 (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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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=118939692&loc=d3e27161-111563 + Details
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