Summary of Significant Accounting Policies - SPPC - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Inventory, raw materials and supplies, gross	$ 826	$ 786
Inventory, other fossil fuel	296	382
Unbilled revenue	718	750
SPPC
Inventory [Line Items]
Inventory, raw materials and supplies, gross	62	67
Inventory, other fossil fuel	3	10
Unbilled revenue	$ 78	$ 59
Generation \| SPPC
Inventory [Line Items]
AFUDC rate	6.75%	6.75%
Natural gas \| SPPC
Inventory [Line Items]
AFUDC rate	5.75%	5.75%
Common Facilities \| SPPC
Inventory [Line Items]
AFUDC rate	6.65%	6.65%

Amount of fossil fuel included in inventory classified as other.

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