Revenue from Contract with Customer - SPPC (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 25,150	$ 20,952	$ 19,844
Regulated assets \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	9,801	9,421	9,465
Regulated assets \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	974	619	686
SPPC
Disaggregation of Revenue [Line Items]
Other revenue	4	5	6
Total operating revenue	965	854	889
SPPC \| Regulated electric
Disaggregation of Revenue [Line Items]
Other revenue	2	3	4
Total operating revenue	848	738	770
SPPC \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Other revenue	2	2	2
Total operating revenue	117	116	119
SPPC \| Regulated assets
Disaggregation of Revenue [Line Items]
Customer revenue	961	849	883
SPPC \| Regulated assets \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Customer revenue	62	50	57
SPPC \| Regulated assets \| Regulated electric
Disaggregation of Revenue [Line Items]
Customer revenue	846	735	766
SPPC \| Regulated assets \| Regulated electric \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Customer revenue	62	50	57
SPPC \| Regulated assets \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Customer revenue	115	114	117
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	899	799	826
SPPC \| Regulated assets \| Fully bundled and distribution services only customer \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	784	685	709
SPPC \| Regulated assets \| Fully bundled and distribution services only customer \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	115	114	117
SPPC \| Regulated assets \| Fully bundled
Disaggregation of Revenue [Line Items]
Customer revenue	896	795	822
SPPC \| Regulated assets \| Fully bundled \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	781	681	705
SPPC \| Regulated assets \| Fully bundled \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	115	114	117
SPPC \| Regulated assets \| Fully bundled \| Residential
Disaggregation of Revenue [Line Items]
Customer revenue	383	349	344
SPPC \| Regulated assets \| Fully bundled \| Residential \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	307	273	268
SPPC \| Regulated assets \| Fully bundled \| Residential \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	76	76	76
SPPC \| Regulated assets \| Fully bundled \| Commercial
Disaggregation of Revenue [Line Items]
Customer revenue	296	262	275
SPPC \| Regulated assets \| Fully bundled \| Commercial \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	267	233	245
SPPC \| Regulated assets \| Fully bundled \| Commercial \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	29	29	30
SPPC \| Regulated assets \| Fully bundled \| Industrial
Disaggregation of Revenue [Line Items]
Customer revenue	212	179	196
SPPC \| Regulated assets \| Fully bundled \| Industrial \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	202	170	186
SPPC \| Regulated assets \| Fully bundled \| Industrial \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	10	9	10
SPPC \| Regulated assets \| Fully bundled \| Other retail
Disaggregation of Revenue [Line Items]
Customer revenue	5	5	7
SPPC \| Regulated assets \| Fully bundled \| Other retail \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	5	5	6
SPPC \| Regulated assets \| Fully bundled \| Other retail \| Regulated natural gas \| Retail Gas
Disaggregation of Revenue [Line Items]
Customer revenue	0	0	1
SPPC \| Regulated assets \| Distribution only service
Disaggregation of Revenue [Line Items]
Customer revenue	3	4	4
SPPC \| Regulated assets \| Distribution only service \| Regulated electric \| Retail Electric
Disaggregation of Revenue [Line Items]
Customer revenue	3	4	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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