Segments and Related Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Investment in subsidiaries	$ 219	$ 208
Regulated Electric	12,123	11,205	$ 9,802
Natural Gas	3,080	2,132	1,636
Other	107	94	88
Regulated and Unregulated Operating Revenue	15,310	13,431	11,526
Depreciation and amortization	2,413	2,121	1,948
Interest charges and financing costs	925	816	798
Total income tax benefit	(135)	(70)	(6)
Net income (loss)	1,736	1,597	1,473
Regulated Electric
Segment Reporting Information [Line Items]
Revenues Including Intersegment Revenues	12,125	11,207	9,804
Depreciation and amortization	2,122	1,855	1,673
Interest charges and financing costs	636	568	534
Total income tax benefit	(162)	(96)	1
Net income (loss)	1,631	1,478	1,407
Regulated Natural Gas
Segment Reporting Information [Line Items]
Revenues Including Intersegment Revenues	3,082	2,134	1,637
Depreciation and amortization	276	254	252
Interest charges and financing costs	86	75	71
Total income tax benefit	68	54	17
Net income (loss)	264	231	190
All Other
Segment Reporting Information [Line Items]
Depreciation and amortization	15	12	23
Interest charges and financing costs	203	173	193
Total income tax benefit	(41)	(28)	(24)
Net income (loss)	(159)	(112)	(124)
Total revenues
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	15,314	13,435	11,529
Total revenues | Regulated Electric
Segment Reporting Information [Line Items]
Regulated Electric	12,123	11,205	9,802
Total revenues | Regulated Natural Gas
Segment Reporting Information [Line Items]
Natural Gas	3,080	2,132	1,636
Total revenues | All Other
Segment Reporting Information [Line Items]
Other	107	94	88
Intersegment Eliminations
Segment Reporting Information [Line Items]
Regulated and Unregulated Operating Revenue	(4)	(4)	(3)
Intersegment Eliminations | Regulated Electric
Segment Reporting Information [Line Items]
Regulated Electric	2	2	2
Intersegment Eliminations | Regulated Natural Gas
Segment Reporting Information [Line Items]
Natural Gas	$ 2	$ 2	$ 1