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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Asset, Current | $ 762 | $ 564
Derivative Asset, Noncurrent | 1,624 | 1,355
Derivative Assets | 2,386 | 1,919
Derivative Liability, Current | 344 | 675
Derivative Liability, Noncurrent | 863 | 516
Derivative Liabilities | 1,340 | 1,191
Current derivative assets [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Margin cash collateral received from counterparties | 2 | 124
Non Current Derivative Assets Member [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Margin cash collateral received from counterparties | 139 | 65
Noncurrent derivative liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Margin cash collateral paid to counterparties | 66 |
Other Current Liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Current other liabilities | 133 |
Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | 5,102 | 4,724
Derivative Liability, Fair Value, Gross Liability | 3,981 | 3,807
Derivative Assets | 2,386 | 1,919
Derivative Liabilities | 1,340 | 1,191
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | 5,050 | 4,651
Derivative Liability, Fair Value, Gross Liability | 3,201 | 3,305
Derivative Assets | 2,350 | 1,840
Derivative Liabilities | 576 | 683
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | 26 | 56
Derivative Liability, Fair Value, Gross Liability | 742 | 472
Derivative Assets | 9 | 49
Derivative Liabilities | 725 | 465
Not Designated as Hedging Instrument [Member] | Foreign currency contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | 26 | 17
Derivative Liability, Fair Value, Gross Liability | 38 | 30
Derivative Assets | 27 | 30
Derivative Liabilities | 39 | 43
FPL[Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Assets | 3 | 0
Derivative Liabilities | 13 | 41
FPL[Member] | Current other assets [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Asset, Current | 3 |
FPL[Member] | Other Current Liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Liability, Current | 12 | 32
FPL[Member] | Other Noncurrent Liabilities [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Liability, Noncurrent | 1 |
Derivative Liabilities |  | 9
FPL[Member] | Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] |  |
Derivative Instruments and Hedging Activities Disclosures [Abstract] |  |
Derivative Asset, Fair Value, Gross Asset | 4 | 2
Derivative Liability, Fair Value, Gross Liability | 14 | 43
Derivative Assets | 3 | 0
Derivative Liabilities | $ 13 | $ 41

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