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Acquisitions (Details) $ in Millions	Mar. 31, 2021 USD ($) state utlity mi	Jul. 16, 2019 USD ($) mi	Jan. 01, 2019 USD ($) customer county mi MW	Dec. 31, 2021 USD ($) county	Jan. 01, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Acquisition [Line Items]
Number of counties In which entity operates | county				8
Goodwill				$ 4,844		$ 4,254
Gulf Power [Member]
Business Acquisition [Line Items]
Cash consideration			$ 4,440
Debt assumed			1,300		$ 1,800
Assets assumed			5,200		6,700
Property, plant, and equipment			4,000		4,900
Regulatory assets			494		1,200
Assumed liabilities			3,400		3,900
Regulatory liabilities			635		566
Deferred income taxes			$ 562		$ 729
Goodwill				2,700
Trans Bay Cable, LLC [Member]
Business Acquisition [Line Items]
Cash consideration		$ 670
Debt assumed		422
Assets assumed		703
Assumed liabilities		$ 643
Goodwill				610
Goodwill, expected tax deductible amount				572
GridLiance [Member]
Business Acquisition [Line Items]
Assets assumed	$ 384
Assumed liabilities	210
Goodwill				592
Goodwill, expected tax deductible amount				586
Cash consideration	502
Business combination, assumption of debt	175
Contingent consideration, liability	$ 264
Gulf Power [Member] | Gulf Power [Member]
Business Acquisition [Line Items]
Number of customers served | customer			470,000
Number of counties In which entity operates | county			8
Length of power lines (mi) | mi			9,500
Natural Gas And Or Oil Electric Generating Facility Capacity | MW			2,300
FPL [Member]
Business Acquisition [Line Items]
Goodwill				2,989		$ 2,989	[1]
FPL [Member] | Gulf Power [Member]
Business Acquisition [Line Items]
Goodwill				$ 2,700
Trans Bay Cable, LLC [Member] | Trans Bay Cable, LLC [Member]
Business Acquisition [Line Items]
Length of power lines (mi) | mi		53
GridLiance Holdco, LP and GridLiance GP, LLC | GridLiance [Member]
Business Acquisition [Line Items]
Length of power lines (mi) | mi	700
Number Of FERC-Regulated Transmission Utilities | utlity	3
Number of States in which Entity Operates | state	6
GridLiance Holdco, LP and GridLiance GP, LLC | GridLiance [Member] | Midwest And Nevada [Member]
Business Acquisition [Line Items]
Number of States in which Entity Operates | state	5
[1] Amounts have been retrospectively adjusted to reflect the merger of FPL and Gulf Power Company, see Note 6 – Merger of FPL and Gulf Power Company.

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