Acquisitions (Details) $ in Millions	Mar. 21, 2023 USD ($) numberOfProjects	Mar. 31, 2021 USD ($) state utlity mi	Dec. 31, 2023 USD ($) county	Dec. 31, 2022 USD ($)	Jan. 01, 2021 USD ($)
Business Acquisition [Line Items]
Goodwill			$ 5,091	$ 4,854
Gulf Power [Member]
Business Acquisition [Line Items]
Debt assumed					$ 1,800
Assets assumed					6,700
Property, plant, and equipment					4,900
Regulatory assets					1,200
Assumed liabilities					3,900
Regulatory liabilities					566
Deferred income taxes					729
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
FPL [Member]
Business Acquisition [Line Items]
Number of counties In which entity operates | county			8
Goodwill			$ 2,965	2,989
FPL [Member] | Gulf Power [Member]
Business Acquisition [Line Items]
Goodwill					$ 2,700
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
NEER [Member] | GridLiance [Member]
Business Acquisition [Line Items]
Contingent consideration, liability			$ 126	$ 203
NEER [Member] | RNG Acquisition
Business Acquisition [Line Items]
Assets assumed	$ 1,300
Assumed liabilities	300
Goodwill	300
Goodwill, expected tax deductible amount	200
Cash consideration	1,100
Business combination, assumption of debt	$ 34
Number of RNG projects | numberOfProjects	31
Number Of RNG Projects, Renewable Gas Facility | numberOfProjects	1
Business Combination, Acquisition, Noncontrolling Interest, Fair Value	$ 100