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Derivative Instruments (Net Notional Volumes and Additional Disclosures) (Details) bbl in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | Dec. 31, 2017 USD ($) MWh MMBTU bbl | Dec. 31, 2016 USD ($) MWh MMBTU bbl
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Interest Rate Swap [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives | $ | $ 12,100 | $ 15,100
Currency Swap [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Notional Amount of Foreign Currency Cash Flow Hedge Derivatives | $ | $ 718 | $ 705
FPL[Member] | Commodity contract - Power [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Non monetary net notional volumes | MWh | 0 | 0
FPL[Member] | Commodity contract - Natural gas [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Non monetary net notional volumes | (142) | (618)
FPL[Member] | Commodity contract - Oil [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Non monetary net notional volumes | bbl | 0 | 0
Short [Member] | Commodity contract - Power [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Non monetary net notional volumes | MWh | (109) | (84)
Short [Member] | Commodity contract - Natural gas [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Non monetary net notional volumes | (74) |
Short [Member] | Commodity contract - Oil [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Non monetary net notional volumes | bbl | (15) | (7)
Long [Member] | Commodity contract - Natural gas [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Non monetary net notional volumes |  | (1,002)

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- Definition Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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