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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets | $ 2,431 | $ 1,919
Derivative Asset, Current | 805 | 564
Derivative Asset, Noncurrent | 1,626 | 1,355
Derivative liability | 1,235 | 1,191
Derivative Liability, Current | 343 | 675
Derivative Liability, Noncurrent | 892 | 516
Current derivative assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 8 | 124
Current derivative liabilities [Member] [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 177 |
Noncurrent derivative liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 43 |
Non Current Derivative Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 65
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 5,189 | 4,724
Derivative liability, fair value, gross liability | 4,205 | 3,807
Derivative assets | 2,431 | 1,919
Derivative liability | 1,235 | 1,191
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 5,152 | 4,651
Derivative liability, fair value, gross liability | 3,594 | 3,305
Derivative assets | 2,399 | 1,840
Derivative liability | 629 | 683
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 14 | 56
Derivative liability, fair value, gross liability | 574 | 472
Derivative assets | 9 | 49
Derivative liability | 569 | 465
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 23 | 17
Derivative liability, fair value, gross liability | 37 | 30
Derivative assets | 23 | 30
Derivative liability | 37 | 43
FPL [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 6 | 0
Derivative liability | 17 | 41
FPL [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | 6 |
FPL [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Current | 13 | 32
FPL [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability |  | 9
Derivative Liability, Noncurrent | 4 |
FPL [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 8 | 2
Derivative liability, fair value, gross liability | 19 | 43
Derivative assets | 6 | 0
Derivative liability | $ 17 | $ 41

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