Summary of Significant Accounting Policies - SPPC - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Inventory [Line Items]
Inventory, raw materials and supplies, gross	$ 1,540	$ 1,259
Inventory, other fossil fuel	422	250
Unbilled revenue	807	787
SPPC
Inventory [Line Items]
Inventory, raw materials and supplies, gross	129	95
Inventory, other fossil fuel	32	22
Unbilled revenue	$ 84	$ 95
Generation \| SPPC
Inventory [Line Items]
AFUDC rate	7.06%	6.85%
Natural gas \| SPPC
Inventory [Line Items]
AFUDC rate	6.14%	5.75%
Common Facilities \| SPPC
Inventory [Line Items]
AFUDC rate	7.06%	6.76%

Amount of fossil fuel included in inventory classified as other.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6)(a))
-Publisher FASB
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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