Summary of Significant Accounting and Reporting Policies (Goodwill and Intangible Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill and Intangible Assets [Line Items]
Goodwill	$ 4,854	$ 4,844
Other intangible assets not subject to amortization, primarily land easements	136	136
Other intangible assets:
Total	722	694
Accumulated amortization	(99)	(88)
Total other intangible assets subject to amortization - net	623	606
Intangible assets, amortization [Abstract]
Amortization expense	18	25	$ 27
Amortization Expense Year 1	20
Amortization Expense Year 2	22
Amortization Expense Year 3	20
Amortization Expense Year 4	22
Amortization Expense Year 5	$ 20
Purchased Power Agreements [Member]
Other intangible assets:
Weighted average useful lives (years)	16 years
Total	$ 549	507
Other, primarily transmission and development rights and customer lists [Member]
Other intangible assets:
Weighted average useful lives (years)	24 years
Total	$ 173	187
Rate-Regulated Transmission [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	1,218	1,206
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	95
Generation Assets [Member]
Goodwill and Intangible Assets [Line Items]
Goodwill	54	56
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