Commitments and Contingencies - PAC - Narrative (Details) - PAC naturalGasProducer in Thousands, a in Thousands, $ in Millions	1 Months Ended			3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($) plaintiff wildfire dam	Apr. 30, 2023 plaintiff	Sep. 30, 2020 a naturalGasProducer	Jun. 30, 2023 USD ($) dam	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) dam	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Construction commitment
Loss Contingencies [Line Items]
Purchase obligation	$ 1,200			$ 1,200		$ 1,200
Fuel contracts
Loss Contingencies [Line Items]
Purchase obligation	$ 425			$ 425		$ 425
Lower Klamath Hydroelectric System
Loss Contingencies [Line Items]
Number of dams | dam	3			3		3
Hydroelectric dam removal cost, total funding	$ 450			$ 450		$ 450
Dam removal cost collected						200
Additional dam removal costs, California bond measure						250
Hydroelectric dam removal cost, additional contingency funding	45			45		45
2020 Wildfires
Loss Contingencies [Line Items]
Number of acres burned | a			500
Number of structures destroyed | naturalGasProducer			2
Estimate of possible loss	1,018			1,018		1,018
Receivable, expected insurance recoveries	$ 379			379		379		$ 246
Probably loss in period				49	$ 64	408	$ 64
2020 Wildfires | James case
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff	17	17
Damages sought (over)	$ 7,000
Number of wildfires | wildfire	4
Damages awarded	$ 90
Multiplier	0.25
2020 Wildfires | James case | Economic and property damages
Loss Contingencies [Line Items]
Damages awarded	$ 4
2020 Wildfires | James case | Noneconomic damages
Loss Contingencies [Line Items]
Damages awarded	68
2020 Wildfires | James case | Punitive damages
Loss Contingencies [Line Items]
Damages awarded	18
2022 McKinney Fire
Loss Contingencies [Line Items]
Estimate of possible loss	31			31		31
Receivable, expected insurance recoveries	$ 103			$ 103		$ 103