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Revenue from Contracts with Customers - SPPC (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Operating revenue	$ 6,229	$ 6,612	$ 12,575	$ 12,642
Regulated \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	2,844	2,591	5,532	4,847
Regulated \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	133	164	525	552
SPPC
Disaggregation of Revenue [Line Items]
Other revenue	1	0	1	2
Operating revenue	337	258	737	537
SPPC \| Regulated electric
Disaggregation of Revenue [Line Items]
Other revenue	0	0	0	1
Operating revenue	293	230	597	457
SPPC \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Other revenue	1	0	1	1
Operating revenue	44	28	140	80
SPPC \| Regulated
Disaggregation of Revenue [Line Items]
Total Customer Revenue	336	258	736	535
SPPC \| Regulated \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	12	14	44	35
SPPC \| Regulated \| Regulated electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	293	230	597	456
SPPC \| Regulated \| Regulated electric \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	12	14	44	35
SPPC \| Regulated \| Regulated natural gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	43	28	139	79
SPPC \| Regulated \| Regulated natural gas \| Wholesale, transmission and other
Disaggregation of Revenue [Line Items]
Total Customer Revenue	0	0	0	0
SPPC \| Regulated \| Total retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	324	244	692	500
SPPC \| Regulated \| Total retail \| Regulated electric \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	281	216	553	421
SPPC \| Regulated \| Total retail \| Regulated natural gas \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	43	28	139	79
SPPC \| Regulated \| Customer Revenue
Disaggregation of Revenue [Line Items]
Total Customer Revenue	323	243	690	497
SPPC \| Regulated \| Customer Revenue \| Residential
Disaggregation of Revenue [Line Items]
Total Customer Revenue	120	98	295	213
SPPC \| Regulated \| Customer Revenue \| Commercial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	114	88	232	172
SPPC \| Regulated \| Customer Revenue \| Industrial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	88	56	160	109
SPPC \| Regulated \| Customer Revenue \| Other retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1	1	3	3
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	280	215	551	418
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Residential
Disaggregation of Revenue [Line Items]
Total Customer Revenue	95	79	210	162
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Commercial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	102	82	193	151
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Industrial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	82	53	145	102
SPPC \| Regulated \| Customer Revenue \| Regulated electric \| Retail electric \| Other retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1	1	3	3
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	43	28	139	79
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Residential
Disaggregation of Revenue [Line Items]
Total Customer Revenue	25	19	85	51
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Commercial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	12	6	39	21
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Industrial
Disaggregation of Revenue [Line Items]
Total Customer Revenue	6	3	15	7
SPPC \| Regulated \| Customer Revenue \| Regulated natural gas \| Retail gas \| Other retail
Disaggregation of Revenue [Line Items]
Total Customer Revenue	0	0	0	0
SPPC \| Regulated \| Distribution only service
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1	1	2	3
SPPC \| Regulated \| Distribution only service \| Regulated electric \| Retail electric
Disaggregation of Revenue [Line Items]
Total Customer Revenue	1	1	2	3
SPPC \| Regulated \| Distribution only service \| Regulated natural gas \| Retail gas
Disaggregation of Revenue [Line Items]
Total Customer Revenue	$ 0	$ 0	$ 0	$ 0