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Derivative Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Derivative [Line Items] |
Schedule of derivative instruments in statement of financial position, fair value | Fair Value of Derivative Instruments - The tables below present NEE's and FPL's gross derivative positions at December 31, 2017 and December 31, 2016, as required by disclosure rules. However, the majority of the underlying contracts are subject to master netting agreements and generally would not be contractually settled on a gross basis. Therefore, the tables below also present the derivative positions on a net basis, which reflect the offsetting of positions of certain transactions within the portfolio, the contractual ability to settle contracts under master netting arrangements and the netting of margin cash collateral (see Note 4 - Recurring Fair Value Measurements for netting information), as well as the location of the net derivative position on the consolidated balance sheets.
| December 31, 2017
| Gross Basis |  | Net Basis
| Assets |  | Liabilities |  | Assets |  | Liabilities
| (millions)
NEE: |  |  |  |  |  |  |
Commodity contracts | $ | 3,962 |  |  | $ | 2,792 |  |  | $ | 1,737 |  |  | $ | 567 |
Interest rate contracts | 50 |  |  | 275 |  |  | 55 |  |  | 280 |
Foreign currency contracts | — |  |  | 40 |  |  | 12 |  |  | 52 |
Total fair values | $ | 4,012 |  |  | $ | 3,107 |  |  | $ | 1,804 |  |  | $ | 899 |
FPL: |  |  |  |  |  |  |
Commodity contracts | $ | 3 |  |  | $ | 3 |  |  | $ | 2 |  |  | $ | 2 |
Net fair value by NEE balance sheet line item: |  |  |  |  |  |  |
Current derivative assets(a) |  |  |  |  | $ | 489 |  |  |
Noncurrent derivative assets |  |  |  |  | 1,315 |  |  |
Current derivative liabilities |  |  |  |  |  |  |  | $ | 364 |
Noncurrent derivative liabilities(b) |  |  |  |  |  |  |  | 535 |
Total derivatives |  |  |  |  | $ | 1,804 |  |  | $ | 899 |
Net fair value by FPL balance sheet line item: |  |  |  |  |  |  |
Current derivative assets |  |  |  |  | $ | 2 |  |  |
Current other liabilities |  |  |  |  |  |  | $ | 2 |
Total derivatives |  |  |  |  | $ | 2 |  |  | $ | 2 |
______________________
(a) | Reflects the netting of approximately $39 million in margin cash collateral received from counterparties.
(b) | Reflects the netting of approximately $39 million in margin cash collateral paid to counterparties.
| December 31, 2016
| Gross Basis |  | Net Basis
| Assets |  | Liabilities |  | Assets |  | Liabilities
| (millions)
NEE: |  |  |  |  |  |  |
Commodity contracts | $ | 4,590 |  |  | $ | 2,968 |  |  | $ | 1,938 |  |  | $ | 483 |
Interest rate contracts | 288 |  |  | 284 |  |  | 296 |  |  | 292 |
Foreign currency contracts | 1 |  |  | 106 |  |  | 1 |  |  | 106 |
Total fair values | $ | 4,879 |  |  | $ | 3,358 |  |  | $ | 2,235 |  |  | $ | 881 |
FPL: |  |  |  |  |  |  |
Commodity contracts | $ | 212 |  |  | $ | 4 |  |  | $ | 209 |  |  | $ | 1 |
Net fair value by NEE balance sheet line item: |  |  |  |  |  |  |
Current derivative assets(a) |  |  |  |  | $ | 885 |  |  |
Noncurrent derivative assets(b) |  |  |  |  | 1,350 |  |  |
Current derivative liabilities |  |  |  |  |  |  | $ | 404 |
Noncurrent derivative liabilities |  |  |  |  |  |  | 477 |
Total derivatives |  |  |  |  | $ | 2,235 |  |  | $ | 881 |
Net fair value by FPL balance sheet line item: |  |  |  |  |  |  |
Current derivative assets |  |  |  |  | $ | 209 |  |  |
Current other liabilities |  |  |  |  |  |  | $ | 1 |
Total derivatives |  |  |  |  | $ | 209 |  |  | $ | 1 |
______________________
(a) | Reflects the netting of approximately $96 million in margin cash collateral received from counterparties.
(b) | Reflects the netting of approximately $71 million in margin cash collateral received from counterparties.
Net notional volumes | NEE and FPL had derivative commodity contracts for the following net notional volumes:
|  | December 31, 2017 |  | December 31, 2016
Commodity Type |  | NEE |  | FPL |  | NEE |  | FPL
|  | (millions)
Power |  | (109 | ) |  | MWh(a) |  | — |  |  |  |  | (84 | ) |  | MWh(a) |  | — |  |  |
Natural gas |  | (74 | ) |  | MMBtu(b) |  | 142 |  |  | MMBtu(b) |  | 1,002 |  |  | MMBtu(b) |  | 618 |  |  | MMBtu(b)
Oil |  | (15 | ) |  | barrels |  | — |  |  |  |  | (7 | ) |  | barrels |  | — |  |  |
______________________
(a) | Megawatt-hours
(b) | One million British thermal units
Not Designated as Hedging Instrument [Member] |
Derivative [Line Items] |
Derivative instruments, gain (loss) in statement of financial performance | Gains (losses) related to NEE's derivatives not designated as hedging instruments are recorded in NEE's consolidated statements of income as follows:
| Years Ended December 31,
| 2017 |  | 2016 |  | 2015
| (millions)
Commodity contracts:(a) |  |  |  |  |
Operating revenues | $ | 454 |  |  | $ | 459 |  |  | $ | 932 |
Fuel, purchased power and interchange | — |  |  | (1 | ) |  | 8 |
Foreign currency contracts - interest expense | 55 |  |  | 14 |  |  | — |
Foreign currency contracts - other - net | (4 | ) |  | (1 | ) |  | — |
Interest rate contracts - interest expense | (223 | ) |  | 181 |  |  | 8 |
Losses reclassified from AOCI to interest expense: |  |  |  |  |
Interest rate contracts | (48 | ) |  | (90 | ) |  | — |
Foreign currency contracts | (81 | ) |  | (11 | ) |  | — |
Total | $ | 153 |  |  | $ | 551 |  |  | $ | 948 |
______________________
(a) | For the years ended December 31, 2017, 2016 and 2015, FPL recorded gains (losses) of approximately $(169) million, $203 million and $(326) million, respectively, related to commodity contracts as regulatory liabilities (assets) on its consolidated balance sheets.
Cash Flow Hedging [Member] |
Derivative [Line Items] |
Derivative instruments, gain (loss) in statement of financial performance | Income Statement Impact of Derivative Instruments - Losses related to NEE's cash flow hedges, which were previously designated as hedging instruments, are recorded in NEE's consolidated financial statements (none at FPL) as follows:
| Year Ended December 31, 2015
| Interest Rate Contracts |  | Foreign Currency Contracts |  | Total
Losses recognized in OCI | $ | (113 | ) |  | $ | (12 | ) |  | $ | (125 | )
Losses reclassified from AOCI to net income | $ | (73 | ) | (a) | $ | (15 | ) | (b) | $ | (88 | )
______________________
(a) | Included in interest expense.
(b) | For 2015, losses of approximately $11 million are included in interest expense and the balances are included in other - net.

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