Non-Derivative Fair Value Measurements (Gains and Losses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule of Available-for-sale Securities[Line Items]
Decommissioning Fund Investments, Fair Value	$ 8,846	$ 7,703
Special Use Funds Storm Fund Assets	76	76
Debt securities, amortized cost	$ 2,438	2,009
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Special Use Funds Storm Fund Weighted Average Maturity	1 year
Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Realized gains	$ 78	110	$ 68
Realized losses	73	70	48
Proceeds from sale and maturity of Available-for-sale Securities	1,831	2,541	3,005
Available for sale securities: Special Use Funds - Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Unrealized gains	76	134
Unrealized losses	19	9
Fair Value	1,100	201
FPL [Member]
Schedule of Available-for-sale Securities[Line Items]
Decommissioning Fund Investments, Fair Value	6,082	5,271
Special Use Funds Storm Fund Assets	76	76
Debt securities, amortized cost	$ 1,877	1,521
Special Use Funds Nuclear Decommissioning Funds Weighted Average Maturity	8 years
Special Use Funds Storm Fund Weighted Average Maturity	1 year
FPL [Member] \| Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Realized gains	$ 59	83	44
Realized losses	57	56	29
Proceeds from sale and maturity of Available-for-sale Securities	1,330	2,162	2,539
FPL [Member] \| Available for sale securities: Special Use Funds - Debt Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
Unrealized gains	63	104
Unrealized losses	15	9
Fair Value	857	150
Equity Securities [Member]
Schedule of Available-for-sale Securities[Line Items]
marketable securities, unrealized gain (loss) recognized during the period on securities still held	981	627	780
Equity Securities [Member] \| FPL [Member]
Schedule of Available-for-sale Securities[Line Items]
marketable securities, unrealized gain (loss) recognized during the period on securities still held	$ 652	$ 444	$ 510

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marketable securities, unrealized gain (loss) recognized during the period on securities still held

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This item represents the weighted-average maturity of debt securities (in years) in nuclear decommissioning funds at the balance sheet date and which are categorized neither as held-to-maturity nor trading securities.

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Storm fund assets held by a regulated entity to pay for storm-related costs as incurred in future periods.

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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).

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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).

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The fair value of investments held in a trust fund to pay for the costs of decontaminating and decommissioning facilities, whether such amount is presented as a separate caption or as a parenthetical disclosure on the balance sheet. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements.

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Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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