Commitments and Contingencies (Required Capacity and/or Minimum Payments Under Contracts) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
FPL[Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2020	$ 1,035
Capacity payments and/or minimum payments - 2021	1,005
Capacity payments and/or minimum payments - 2022	985
Capacity payments and/or minimum payments - 2023	975
Capacity payments and/or minimum payments - 2024	970
Capacity payments and/or minimum payments - Thereafter	11,625
Related Party Transaction, Amounts of Transaction	316	$ 303
FPL[Member] | Natural Gas Including Transportation and Storage Contract Minimum Payments [Member] | Sabal Trail and Florida Southeast Connection [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2020	385
Capacity payments and/or minimum payments - 2021	415
Capacity payments and/or minimum payments - 2022	415
Capacity payments and/or minimum payments - 2023	410
Capacity payments and/or minimum payments - 2024	410
Capacity payments and/or minimum payments - Thereafter	6,765
NEER [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2020	3,355
Capacity payments and/or minimum payments - 2021	395
Capacity payments and/or minimum payments - 2022	255
Capacity payments and/or minimum payments - 2023	130
Capacity payments and/or minimum payments - 2024	140
Capacity payments and/or minimum payments - Thereafter	1,415
Commitment to invest	110
Joint Obligations Next Year	60
Joint Obligations Second Year	20
Joint Obligations Third Year	20
Joint Obligations Fourth Year	20
Joint Obligations Fifth Year	10
Joint Obligations After Fifth Year	15
NEER [Member] | Mountain Valley Pipeline [Member]
Long-term Purchase Commitment [Line Items]
Capacity payments and/or minimum payments - 2021	70
Capacity payments and/or minimum payments - 2022	70
Capacity payments and/or minimum payments - 2023	70
Capacity payments and/or minimum payments - 2024	70
Capacity payments and/or minimum payments - Thereafter	1,110
NEER [Member] | Contract Group 1 [Member]
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures	$ 3,800
Join Venture [Member] | NEER [Member]
Long-term Purchase Commitment [Line Items]
Ownership interest	31.00%
Consolidation, Eliminations [Member] | FPL[Member]
Long-term Purchase Commitment [Line Items]
Related Party Transaction, Amounts of Transaction	$ 108	$ 95