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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets | $ 2,063 | $ 2,386
Derivative Asset, Current | 441 | 762
Derivative Asset, Noncurrent | 1,622 | 1,624
Derivative liability | 1,890 | 1,340
Derivative Liability, Current | 310 | 344
Derivative Liability, Noncurrent | 1,580 | 863
Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Liabilities Associated with Assets Held-for-Sale |  | 133
Current derivative assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral |  | 2
Non Current Derivative Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 158 | 139
Current derivative liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Collateral, Right to Reclaim Cash, Offset | 14 | 66
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4,483 | 5,102
Derivative liability, fair value, gross liability | 4,166 | 3,981
Derivative assets | 2,063 | 2,386
Derivative liability | 1,890 | 1,340
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4,435 | 5,050
Derivative liability, fair value, gross liability | 2,795 | 3,201
Derivative assets | 2,039 | 2,350
Derivative liability | 543 | 576
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 33 | 26
Derivative liability, fair value, gross liability | 1,324 | 742
Derivative assets | 5 | 9
Derivative liability | 1,296 | 725
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 15 | 26
Derivative liability, fair value, gross liability | 47 | 38
Derivative assets | 19 | 27
Derivative liability | 51 | 39
FPL [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 2 | 3
Derivative liability | 11 | 13
FPL [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | 2 | 3
FPL [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Current | 10 | 12
FPL [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Noncurrent | 1 | 1
FPL [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4 | 4
Derivative liability, fair value, gross liability | 13 | 14
Derivative assets | 2 | 3
Derivative liability | $ 11 | $ 13

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