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Summary of Significant Accounting and Reporting Policies (Regulatory Assets and Liabilities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current:    
Early retirement of generation facilities and transmission assets $ 140 $ 36
Acquisition of purchased power agreements 141 161
Deferred clause and franchise expenses 698 28
Other 146 152
Total 1,125 377
Noncurrent:    
Acquisition of purchased power agreements 2,233 1,438
Acquisition of purchased power agreements 332 473
Accrued asset removal costs 263 0
Other 1,750 1,801
Total 4,578 3,712
Current:    
Deferred clause revenues 274 215
Other 15 30
Total 289 245
Noncurrent:    
Asset retirement obligation regulatory expense difference 4,290 3,583
Accrued asset removal costs 782 1,206
Deferred taxes 4,561 4,698
Other 1,640 1,248
Total 11,273 10,735
FPL [Member]    
Current:    
Early retirement of generation facilities and transmission assets 140 36
Acquisition of purchased power agreements 141 161
Deferred clause and franchise expenses 698 28
Other 132 135
Total 1,111 360 [1]
Noncurrent:    
Acquisition of purchased power agreements 2,233 1,438
Acquisition of purchased power agreements 332 473
Accrued asset removal costs 263 0
Other 1,515 1,488
Total 4,343 3,399 [1]
Current:    
Deferred clause revenues 274 215
Other 4 9
Total 278 224 [1]
Noncurrent:    
Asset retirement obligation regulatory expense difference 4,290 3,583
Accrued asset removal costs 752 1,179
Deferred taxes 4,457 4,594
Other 1,554 1,244
Total $ 11,053 $ 10,600
Generation Facilities And Transmission Assets    
Noncurrent:    
Regulatory asset, amortization period 20 years  
Purchased Power Agreements    
Noncurrent:    
Regulatory asset, amortization period 9 years  
[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.