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Summary of Significant Accounting and Reporting Policies - Property, Plant and Equiptment (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Electric plant in service and other property $ 115,172 $ 112,500
Nuclear fuel 1,561 1,606
Construction work in progress 14,721 14,141
Property, plant and equipment, gross 131,454 128,247
Accumulated depreciation and amortization (29,519) (28,899)
Property, plant and equipment – net 101,935 99,348
Florida Power & Light Company    
Property, Plant and Equipment [Line Items]    
Electric plant in service and other property 69,119 67,771
Nuclear fuel 1,124 1,170
Construction work in progress 6,543 6,326
Property, plant and equipment, gross 76,786 75,267
Accumulated depreciation and amortization (17,238) (17,040)
Electric utility plant and other property – net $ 59,548 $ 58,227