Business Segments (Schedule of Revenue, By Products and Services) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Revenues	$ 7,351	$ 7,842	$ 6,564	$ 7,011	$ 6,117	$ 6,834	$ 5,638	$ 6,032	$ 28,768	$ 24,621	$ 23,366
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									25,990	22,570	21,687
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									2,748	2,022	1,653
Total Reportable Segments
Segment Reporting Information [Line Items]
Revenues									28,738	24,592	23,340
Retail Electric
Segment Reporting Information [Line Items]
Revenues									22,036	19,410	18,898
Retail Electric | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									22,036	19,410	18,898
Wholesale Electric
Segment Reporting Information [Line Items]
Revenues									2,882	2,216	1,878
Wholesale Electric | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									2,882	2,216	1,878
Retail Natural Gas
Segment Reporting Information [Line Items]
Revenues									2,535	2,025	1,691
Retail Natural Gas | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									2,535	2,025	1,691
Other
Segment Reporting Information [Line Items]
Revenues									1,411	1,064	1,001
Other | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									1,106	977	944
Other | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									305	87	57
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									26,024	22,603	21,720
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Revenues									2,840	2,112	1,748
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Revenues									$ 28,864	$ 24,715	$ 23,468