Summary of Significant Accounting and Reporting Policies (Regulatory Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Current:
Acquisition of purchased power agreements	$ 165	$ 165
Deferred clause and franchise expenses	5	146
Other	165	137
Total	335	448
Noncurrent:
Acquisition of purchased power agreements	634	798
Other	2,653	2,492
Total	3,287	3,290
Current:
Deferred clause revenues	309	265
Other	11	60
Total	320	325
Noncurrent:
Asset retirement obligation regulatory expense difference	2,826	2,352
Accrued asset removal costs	1,346	991
Deferred taxes	4,862	4,815
Other	902	851
Total	9,936	9,009
FPL[Member]
Current:
Acquisition of purchased power agreements	165	165
Deferred clause and franchise expenses	5	146
Other	57	136
Total	227	447
Noncurrent:
Acquisition of purchased power agreements	634	798
Other	1,915	2,045
Total	2,549	2,843
Current:
Deferred clause revenues	284	265
Other	0	45
Total	284	310
Noncurrent:
Asset retirement obligation regulatory expense difference	2,828	2,352
Accrued asset removal costs	1,157	972
Deferred taxes	4,397	4,736
Other	914	826
Total	$ 9,296	$ 8,886