Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020		Dec. 31, 2019
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 4,844	$ 4,254
Other intangible assets not subject to amortization, primarily land easements	136	135
Other intangible assets:
Total	694	619
Accumulated amortization	(88)	(61)
Total other intangible assets subject to amortization - net	606	558
Intangible assets, amortization [Abstract]
Amortization expense	25	27		$ 18
Amortization Expense Year 1	16
Amortization Expense Year 2	16
Amortization Expense Year 3	18
Amortization Expense Year 4	16
Amortization Expense Year 5	$ 16
Purchased Power Agreements [Member]
Other intangible assets:
Weighted average useful lives (years)	15 years
Total	$ 507	453
Other, primarily transmission and development rights and customer lists [Member]
Other intangible assets:
Weighted average useful lives (years)	23 years
Total	$ 187	166
Rate-Regulated Transmission [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	1,206	614
Gas Infrastructure, primarily Texas pipelines [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	487	487
Customer Supply [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	95	93
Generation Assets [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	56	60
Other Goodwill Assets [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	11	11
FPL [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	2,989	2,989	[1]
FPL [Member] | Florida City Gas [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	292	292
FPL [Member] | Other Goodwill Assets [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	9	9
Gulf Power [Member] | Other Goodwill Assets [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 2,688	$ 2,688

[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.