Long-term Debt - SPPC (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Par value	$ 55,471
Maturity Schedule
2026	1,366
2029 and thereafter	46,017
Total	55,471
Subsidiary debt
Debt Instrument [Line Items]
Par value	42,270
Subsidiary debt	42,150	$ 38,971
Maturity Schedule
Total	42,270
Subsidiary debt	42,150	38,971
SPPC
Debt Instrument [Line Items]
Par value	1,537
Subsidiary debt	1,527	1,293
Maturity Schedule
Total	1,537
Subsidiary debt	1,527	1,293
SPPC \| 2.60% Series U, due 2026
Debt Instrument [Line Items]
Par value	400
Maturity Schedule
Total	400
SPPC \| 6.75% Series P, due 2037
Debt Instrument [Line Items]
Par value	252
Maturity Schedule
Total	252
SPPC \| 4.71% Series W, due 2052
Debt Instrument [Line Items]
Par value	250
Maturity Schedule
Total	250
SPPC \| 5.90% Series 2023A, due 2054
Debt Instrument [Line Items]
Par value	400
Maturity Schedule
Total	$ 400
SPPC \| 3.55% Pollution Control Series 2016A, due 2029
Debt Instrument [Line Items]
Stated rate	3.55%
Par value	$ 20
Maturity Schedule
Total	$ 20
SPPC \| 3.550% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Stated rate	3.55%
Par value	$ 30
Subject to mandatory sinking fund redemption	10
Maturity Schedule
Total	$ 30
SPPC \| 3.625% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Stated rate	3.625%
Par value	$ 60
Maturity Schedule
Total	$ 60
SPPC \| 4.125% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Stated rate	4.125%
Par value	$ 30
Maturity Schedule
Total	$ 30
SPPC \| 4.125% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Stated rate	4.125%
Par value	$ 75
Maturity Schedule
Total	$ 75
SPPC \| 3.625% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Stated rate	3.625%
Par value	$ 20
Maturity Schedule
Total	20
SPPC \| Subsidiary debt
Debt Instrument [Line Items]
Par value	1,537
Subsidiary debt	1,527
Maturity Schedule
2026	410
2029 and thereafter	1,127
Total	1,537
Unamortized discount and debt issuance costs	(10)
Subsidiary debt	$ 1,527
SPPC \| Subsidiary debt \| 2.60% Series U, due 2026
Debt Instrument [Line Items]
Stated rate	2.60%
Subsidiary debt	$ 399	398
Maturity Schedule
Subsidiary debt	$ 399	398
SPPC \| Subsidiary debt \| 6.75% Series P, due 2037
Debt Instrument [Line Items]
Stated rate	6.75%
Subsidiary debt	$ 254	254
Maturity Schedule
Subsidiary debt	$ 254	254
SPPC \| Subsidiary debt \| 4.71% Series W, due 2052
Debt Instrument [Line Items]
Stated rate	4.71%
Subsidiary debt	$ 248	248
Maturity Schedule
Subsidiary debt	$ 248	248
SPPC \| Subsidiary debt \| 5.90% Series 2023A, due 2054
Debt Instrument [Line Items]
Stated rate	5.90%
Subsidiary debt	$ 394	393
Maturity Schedule
Subsidiary debt	394	393
SPPC \| Subsidiary debt \| 3.55% Pollution Control Series 2016A, due 2029
Debt Instrument [Line Items]
Subsidiary debt	20	0
Maturity Schedule
Subsidiary debt	20	0
SPPC \| Subsidiary debt \| 3.550% Pollution Control Series 2016B, due 2029
Debt Instrument [Line Items]
Subsidiary debt	29	0
Maturity Schedule
Subsidiary debt	29	0
SPPC \| Subsidiary debt \| 3.625% Gas and Water Series 2016B, due 2036
Debt Instrument [Line Items]
Subsidiary debt	59	0
Maturity Schedule
Subsidiary debt	59	0
SPPC \| Subsidiary debt \| 4.125% Water Facilities Series 2016C, due 2036
Debt Instrument [Line Items]
Subsidiary debt	30	0
Maturity Schedule
Subsidiary debt	30	0
SPPC \| Subsidiary debt \| 4.125% Water Facilities Series 2016F, due 2036
Debt Instrument [Line Items]
Subsidiary debt	74	0
Maturity Schedule
Subsidiary debt	74	0
SPPC \| Subsidiary debt \| 3.625% Water Facilities Series 2016G, due 2036
Debt Instrument [Line Items]
Subsidiary debt	20	0
Maturity Schedule
Subsidiary debt	$ 20	$ 0

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