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Summary of Significant Accounting and Reporting Policies - Property, Plant and Equiptment (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Electric plant in service and other property $ 110,776 $ 105,860
Nuclear fuel 1,734 1,604
Construction work in progress 15,342 10,639
Property, plant and equipment, gross 127,852 118,103
Accumulated depreciation and amortization (28,711) (26,300)
Property, plant and equipment – net 99,141 91,803
FPL [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 74,027 69,467
Electric plant in service and other property 66,367 62,963
Nuclear fuel 1,187 1,143
Construction work in progress 6,473 5,361
Accumulated depreciation and amortization (17,001) (15,588)
Electric utility plant and other property – net $ 57,026 $ 53,879 [1]
[1] Amounts have been retrospectively adjusted to reflect the merger of FPL and Gulf Power Company, see Note 5 – Merger of FPL and Gulf Power Company.