Revenue from Contracts with Customers - SPPC (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,346	$ 6,030
Regulated \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2,688	2,256
Regulated \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	392	388
SPPC
Disaggregation of Revenue [Line Items]
Other revenue	0	1
Operating revenue	400	279
SPPC \| Regulated electric
Disaggregation of Revenue [Line Items]
Other revenue	0	0
Operating revenue	304	227
SPPC \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Other revenue	0	1
Operating revenue	96	52
SPPC \| Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	400	278
SPPC \| Regulated \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	32	21
SPPC \| Regulated \| Regulated electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	304	227
SPPC \| Regulated \| Regulated electric \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	32	21
SPPC \| Regulated \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	96	51
SPPC \| Regulated \| Regulated natural gas \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	0	0
SPPC \| Regulated \| Total retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	368	257
SPPC \| Regulated \| Total retail \| Regulated electric \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	272	206
SPPC \| Regulated \| Total retail \| Regulated natural gas \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	96	51
SPPC \| Regulated \| Customer Revenue
Disaggregation of Revenue [Line Items]
Total Customer Revenue	367	256
SPPC \| Regulated \| Customer Revenue \| Residential
Disaggregation of Revenue [Line Items]
Total Customer Revenue	175	117
SPPC \| Regulated \| Customer Revenue \| Commercial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	118	85
SPPC \| Regulated \| Customer Revenue \| Industrial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	72	53
SPPC \| Regulated \| Customer Revenue \| Other retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2	1
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	271	205
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Residential
Disaggregation of Revenue [Line Items]
Total Customer Revenue	115	85
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Commercial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	91	70
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Industrial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	63	49
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Other retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2	1
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	96	51
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Residential
Disaggregation of Revenue [Line Items]
Total Customer Revenue	60	32
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Commercial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	27	15
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Industrial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	9	4
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Other retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	0	0
SPPC \| Regulated \| Distribution only service
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1	1
SPPC \| Regulated \| Distribution only service \| Regulated electric \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1	1
SPPC \| Regulated \| Distribution only service \| Regulated natural gas \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 0	$ 0

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