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v3.19.3.a.u2

Derivative Instruments (Net Notional Volumes and Additional Disclosures) (Details) bbl in Millions, MWh in Millions, MMBTU in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) MWh MMBTU bbl | Dec. 31, 2018 USD ($) MWh MMBTU bbl
Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ | $ 8,900 | $ 13,400
Currency Swap [Member] |  |
Derivative [Line Items] |  |
Derivative, Notional Amount | $ | $ 1,000 | $ 656
Short [Member] | Commodity contract - Power [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Derivative, Nonmonetary Notional Amount | MWh | 81 | 100
Short [Member] | Commodity contract - Natural gas [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 1,723 | 491
Short [Member] | Commodity contract - Oil [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Derivative, Nonmonetary Notional Amount, Volume | bbl | 13 | 30
Short [Member] | FPL[Member] | Commodity contract - Oil [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Derivative, Nonmonetary Notional Amount, Volume | bbl | 0 | 0
Long [Member] | FPL[Member] | Commodity contract - Power [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Derivative, Nonmonetary Notional Amount | MWh | 1 | 1
Long [Member] | FPL[Member] | Commodity contract - Natural gas [Member] |  |
Schedule of net notional volume of commodity derivative instruments [Abstract] |  |
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 161 | 231

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