Commitments and Contingencies (Long-term Purchase Commitment) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2021	Mar. 31, 2020
NEER Segment
Required capacity and/or minimum payments [Abstract]
Remainder of 2021	$ 3,430
2022	955
2023	210
2024	210
2025	140
Thereafter	1,785
Commitment to invest	50
Joint Obligations Remainder Current Year	580
Joint Obligations Second Year	10
Joint Obligations Third Year	10
Joint Obligations Fourth Year	10
Joint Obligations Fifth Year	5
Contract Group 1 [Member] \| NEER Segment
Long-term Purchase Commitment [Line Items]
Commitment amount included in capital expenditures	4,200
Mountain Valley Pipeline [Member] \| NEER Segment
Required capacity and/or minimum payments [Abstract]
2022	25
2023	70
2024	70
2025	70
Thereafter	$ 1,155
Equity method investment, ownership percentage	31.50%
FPL [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2021	$ 780
2022	970
2023	955
2024	940
2025	890
Thereafter	9,365
Related Party Transaction, Amounts of Transaction	103	$ 79
FPL [Member] \| Sabal Trail and Florida Southeast Connection [Member] \| Natural Gas, Including Transportation And Storage, Contract Minimum Payments [Member]
Required capacity and/or minimum payments [Abstract]
Remainder of 2021	315
2022	415
2023	410
2024	410
2025	405
Thereafter	6,360
Consolidation, Eliminations [Member] \| FPL [Member]
Required capacity and/or minimum payments [Abstract]
Related Party Transaction, Amounts of Transaction	$ 26	$ 27

Commitment to invest in clean power and technology businesses.

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- Definition

Commitments included in planned capital expenditures

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No definition available.

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- Definition

Joint obligations of NEECH and NEER included in NEER amounts above due in the fifth year

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Joint obligations of NEECH and NEER included in the NEER amounts above due in the fourth year

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Joint Obligations of NEECH and NEER included in the NEER amounts above due in the remainder of the current year

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Joint Obligations of NEECH and NEER included in the NEER amounts above due in the second year

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Joint obligations of NEECH and NEER included in NEER amounts above due in the third year

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- Definition

Required Capacity And Or Minimum Payments Abstract

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Estimated required capacity and/or minimum payments after the fifth year.

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Estimated required capacity and/or minimum payments for the fifth year.

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Estimated required capacity and/or minimum payments for the fourth year.

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Estimated required capacity and/or minimum payments for the remainder of the current year.

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Estimated required capacity and/or minimum payments for the second year.

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Estimated required capacity and/or minimum payments for the third year.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of transactions with related party during the financial reporting period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
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