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Segment Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Segment Reporting [Abstract]
Equity Method Investments	$ 214		$ 214		$ 208
Segment Reporting Information [Line Items]
Electric	3,699	$ 3,176	9,255	$ 8,643
Net income	649	609	1,357	1,282
Natural gas	357	268	1,923	1,364
Other	26	23	79	69
Regulated and Unregulated Operating Revenue	4,082	3,467	11,257	10,076
Equity Method Investments	214		214		208
Operating Segments
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	4,083	3,468	11,259	10,079
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	(1)	(1)	(2)	(3)
Regulated Electric
Segment Reporting Information [Line Items]
Net income	697	629	1,312	1,202
Revenues Including Intersegment Revenues	3,699	3,176	9,256	8,644
Regulated Electric | Operating Segments
Segment Reporting Information [Line Items]
Electric			9,255	8,643
Regulated Electric | Intersegment Eliminations
Segment Reporting Information [Line Items]
Electric			1	1
Regulated Natural Gas
Segment Reporting [Abstract]
Equity Method Investments	214		214		208
Segment Reporting Information [Line Items]
Net income	(7)	10	148	161
Revenues Including Intersegment Revenues	358	269	1,924	1,366
Equity Method Investments	214		214		$ 208
Regulated Natural Gas | Operating Segments
Segment Reporting Information [Line Items]
Natural gas	357	268	1,923	1,364
Regulated Natural Gas | Intersegment Eliminations
Segment Reporting Information [Line Items]
Natural gas	1	1	1	2
All Other
Segment Reporting Information [Line Items]
Net income	(41)	(30)	(103)	(81)
All Other | Operating Segments
Segment Reporting Information [Line Items]
Other	$ 26	$ 23	$ 79	$ 69

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