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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets | $ 2,229 | $ 1,919
Derivative Asset, Current | 580 | 564
Derivative Asset, Noncurrent | 1,649 | 1,355
Derivative liability | 1,472 | 1,191
Derivative Liability, Current | 239 | 675
Derivative Liability, Noncurrent | 1,233 | 516
Current derivative assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 2 | 124
Current derivative liabilities [Member] [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 6 |
Non Current Derivative Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 61 | 65
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4,463 | 4,724
Derivative liability, fair value, gross liability | 3,649 | 3,807
Derivative assets | 2,229 | 1,919
Derivative liability | 1,472 | 1,191
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4,416 | 4,651
Derivative liability, fair value, gross liability | 2,651 | 3,305
Derivative assets | 2,203 | 1,840
Derivative liability | 495 | 683
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 27 | 56
Derivative liability, fair value, gross liability | 956 | 472
Derivative assets | 6 | 49
Derivative liability | 935 | 465
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 20 | 17
Derivative liability, fair value, gross liability | 42 | 30
Derivative assets | 20 | 30
Derivative liability | 42 | 43
FPL [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 7 | 0
Derivative liability | 16 | 41
FPL [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | 7 |
FPL [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Current | 14 | 32
FPL [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability |  | 9
Derivative Liability, Noncurrent | 2 |
FPL [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 10 | 2
Derivative liability, fair value, gross liability | 19 | 43
Derivative assets | 7 | 0
Derivative liability | $ 16 | $ 41

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