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Derivative Instruments (Balance Sheet Disclosure) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Derivatives, Fair Value [Line Items] |  |
Derivative assets | $ 1,838 | $ 1,804
Derivative Asset, Current | 463 | 489
Derivative Asset, Noncurrent | 1,375 | 1,315
Derivative liability | 1,005 | 899
Derivative Liability, Current | 483 | 364
Derivative Liability, Noncurrent | 522 | 535
Current derivative assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 28 | 39
Non Current Derivative Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Fair Value, Amount Offset Against Collateral | 48 |
Noncurrent derivative liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative liability, collateral, right to reclaim cash, offset |  | 39
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4,263 | 4,012
Derivative liability, fair value, gross liability | 3,354 | 3,107
Derivative assets | 1,838 | 1,804
Derivative liability | 1,005 | 899
Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4,100 | 3,962
Derivative liability, fair value, gross liability | 3,122 | 2,792
Derivative assets | 1,669 | 1,737
Derivative liability | 767 | 567
Interest Rate Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 163 | 50
Derivative liability, fair value, gross liability | 203 | 275
Derivative assets | 156 | 55
Derivative liability | 196 | 280
Foreign Exchange Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 0 | 0
Derivative liability, fair value, gross liability | 29 | 40
Derivative assets | 13 | 12
Derivative liability | 42 | 52
FPL [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 3 | 2
Derivative liability | 3 | 2
FPL [Member] | Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset, Current | 3 | 2
FPL [Member] | Other Current Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Current | 2 | 2
FPL [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Noncurrent | 1 |
FPL [Member] | Commodity Contract [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative asset, fair value, gross asset | 4 | 3
Derivative liability, fair value, gross liability | 4 | 3
Derivative assets | 3 | 2
Derivative liability | $ 3 | $ 2

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