Revenue from Contract with Customer - PAC (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenue from External Customer [Line Items]
Total operating revenue	$ 26,337	$ 25,150	$ 20,952
PAC
Revenue from External Customer [Line Items]
Other revenue	52	41	98
Total operating revenue	5,679	5,296	5,341
Regulated assets | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	10,884	9,801	9,421
Regulated assets | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	1,024	727	366
Regulated assets | Transmission and distribution
Revenue from External Customer [Line Items]
Customer revenue	2,067	2,000	1,779
Regulated assets | Other
Revenue from External Customer [Line Items]
Customer revenue	105	109	110
Regulated assets | PAC
Revenue from External Customer [Line Items]
Customer revenue	5,627	5,255	5,243
Regulated assets | PAC | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	5,099	4,847	4,932
Regulated assets | PAC | Wholesale
Revenue from External Customer [Line Items]
Customer revenue	260	157	107
Regulated assets | PAC | Transmission and distribution
Revenue from External Customer [Line Items]
Customer revenue	166	143	96
Regulated assets | PAC | Other
Revenue from External Customer [Line Items]
Customer revenue	102	108	108
Regulated assets | PAC | Residential | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	2,013	1,914	1,910
Regulated assets | PAC | Commercial | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	1,645	1,559	1,578
Regulated assets | PAC | Industrial | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	1,163	1,125	1,185
Regulated assets | PAC | Other retail | Retail Electric
Revenue from External Customer [Line Items]
Customer revenue	$ 278	$ 249	$ 259