Revenue from Contract with Customer - SPPC (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 26,337	$ 25,150	$ 20,952
Regulated assets \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	10,884	9,801	9,421
Regulated assets \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	1,022	974	619
SPPC
Disaggregation of Revenue [Line Items]
Other revenue	2	4	5
Total operating revenue	1,193	965	854
SPPC \| Regulated electric
Disaggregation of Revenue [Line Items]
Other revenue	1	2	3
Total operating revenue	1,025	848	738
SPPC \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Other revenue	1	2	2
Total operating revenue	168	117	116
SPPC \| Regulated assets
Disaggregation of Revenue [Line Items]
Customer revenue	1,191	961	849
SPPC \| Regulated assets \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Customer revenue	86	62	50
SPPC \| Regulated assets \| Regulated electric
Disaggregation of Revenue [Line Items]
Customer revenue	1,024	846	735
SPPC \| Regulated assets \| Regulated electric \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Customer revenue	86	62	50
SPPC \| Regulated assets \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Customer revenue	167	115	114
SPPC \| Regulated assets \| Regulated natural gas \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Customer revenue	0	0	0
SPPC \| Regulated assets \| Fully bundled and distribution services only customer
Disaggregation of Revenue [Line Items]
Customer revenue	1,105	899	799
SPPC \| Regulated assets \| Fully bundled and distribution services only customer \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	938	784	685
SPPC \| Regulated assets \| Fully bundled and distribution services only customer \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	167	115	114
SPPC \| Regulated assets \| Fully bundled
Disaggregation of Revenue [Line Items]
Customer revenue	1,100	896	795
SPPC \| Regulated assets \| Fully bundled \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	933	781	681
SPPC \| Regulated assets \| Fully bundled \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	167	115	114
SPPC \| Regulated assets \| Fully bundled \| Residential
Disaggregation of Revenue [Line Items]
Customer revenue	470	383	349
SPPC \| Regulated assets \| Fully bundled \| Residential \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	365	307	273
SPPC \| Regulated assets \| Fully bundled \| Residential \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	105	76	76
SPPC \| Regulated assets \| Fully bundled \| Commercial
Disaggregation of Revenue [Line Items]
Customer revenue	378	296	262
SPPC \| Regulated assets \| Fully bundled \| Commercial \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	333	267	233
SPPC \| Regulated assets \| Fully bundled \| Commercial \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	45	29	29
SPPC \| Regulated assets \| Fully bundled \| Industrial
Disaggregation of Revenue [Line Items]
Customer revenue	245	212	179
SPPC \| Regulated assets \| Fully bundled \| Industrial \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	229	202	170
SPPC \| Regulated assets \| Fully bundled \| Industrial \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	16	10	9
SPPC \| Regulated assets \| Fully bundled \| Other retail
Disaggregation of Revenue [Line Items]
Customer revenue	7	5	5
SPPC \| Regulated assets \| Fully bundled \| Other retail \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	6	5	5
SPPC \| Regulated assets \| Fully bundled \| Other retail \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	1	0	0
SPPC \| Regulated assets \| Distribution-only service
Disaggregation of Revenue [Line Items]
Customer revenue	5	3	4
SPPC \| Regulated assets \| Distribution-only service \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	5	3	4
SPPC \| Regulated assets \| Distribution-only service \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	$ 0	$ 0	$ 0

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