Summary of Significant Accounting Policies - SPPC - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Inventory [Line Items]
Inventory, raw materials and supplies, gross	$ 1,259	$ 1,008
Inventory, other fossil fuel	250	248
Unbilled revenue	787	828
SPPC
Inventory [Line Items]
Inventory, raw materials and supplies, gross	95	69
Inventory, other fossil fuel	22	10
Unbilled revenue	$ 95	$ 94
Generation \| SPPC
Inventory [Line Items]
AFUDC rate	6.85%	5.52%
Natural gas \| SPPC
Inventory [Line Items]
AFUDC rate	5.75%	5.09%
Common Facilities \| SPPC
Inventory [Line Items]
AFUDC rate	6.76%	5.23%

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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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