Business Segments (Schedule of Revenue, By Products and Services) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Operating Revenues	$ 7,212	$ 7,994	$ 6,578	$ 7,276	$ 7,351	$ 7,842	$ 6,564	$ 7,011	$ 29,060	$ 28,768	$ 24,621
Total Reportable Segments
Segment Reporting Information [Line Items]
Operating Revenues									29,023	28,738	24,592
Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									26,846	25,990	22,570
Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									2,177	2,748	2,022
Operating Segments | Total Reportable Segments
Segment Reporting Information [Line Items]
Operating Revenues									29,187	28,864	24,715
Operating Segments | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									26,921	26,024	22,603
Operating Segments | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									2,266	2,840	2,112
Operating Segments | Retail Electric
Segment Reporting Information [Line Items]
Operating Revenues									23,484	22,036	19,410
Operating Segments | Retail Electric | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									23,484	22,036	19,410
Operating Segments | Wholesale Electric
Segment Reporting Information [Line Items]
Operating Revenues									2,193	2,882	2,216
Operating Segments | Wholesale Electric | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									2,193	2,882	2,216
Operating Segments | Retail Natural Gas
Segment Reporting Information [Line Items]
Operating Revenues									2,199	2,535	2,025
Operating Segments | Retail Natural Gas | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									2,199	2,535	2,025
Operating Segments | Other
Segment Reporting Information [Line Items]
Operating Revenues									1,311	1,411	1,064
Operating Segments | Other | Electric Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									1,244	1,106	977
Operating Segments | Other | Gas Utilities and Infrastructure
Segment Reporting Information [Line Items]
Operating Revenues									$ 67	$ 305	$ 87