Summary of Significant Accounting Policies - SPPC - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021
Inventory [Line Items]
Inventory, raw materials and supplies, gross	$ 1,008	$ 826
Inventory, other fossil fuel	248	296
Unbilled revenue	828	718
SPPC
Inventory [Line Items]
Inventory, raw materials and supplies, gross	69	62
Inventory, other fossil fuel	10	3
Unbilled revenue	$ 94	$ 78
Generation \| SPPC
Inventory [Line Items]
AFUDC rate	5.52%	6.75%
Natural gas \| SPPC
Inventory [Line Items]
AFUDC rate	5.09%	5.75%
Common Facilities \| SPPC
Inventory [Line Items]
AFUDC rate	5.23%	6.65%

Amount of fossil fuel included in inventory classified as other.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
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