Commitments and Contingencies - PAC - Narrative (Details) naturalGasProducer in Thousands, a in Thousands, $ in Millions			1 Months Ended								3 Months Ended		27 Months Ended
	Apr. 29, 2024 class_member	Feb. 13, 2024 plaintiff	May 03, 2024 USD ($)	Apr. 30, 2024 USD ($) class_member	Mar. 31, 2024 USD ($) dam plaintiff	Jan. 31, 2024 plaintiff	Sep. 30, 2023 trial	Jun. 30, 2023 USD ($) wildfire plaintiff	Apr. 30, 2023 plaintiff	Sep. 30, 2020 a naturalGasProducer	Mar. 31, 2024 USD ($) dam	Mar. 31, 2023 USD ($)	Mar. 31, 2024 USD ($) dam	Dec. 31, 2023 USD ($)
Loss Contingencies [Line Items]
Wildfire losses, net of recoveries											$ 0	$ 359
PAC
Loss Contingencies [Line Items]
Estimated loss accrual, current					$ 269						269		$ 269	$ 4
Wildfire losses, net of recoveries											0	359
PAC | 2020 Wildfires
Loss Contingencies [Line Items]
Number of acres burned | a										500
Number of structures destroyed | naturalGasProducer										2
Settlement payments													702
PAC | 2020 Wildfires | Subsequent event
Loss Contingencies [Line Items]
Settlement payments			$ 52
Litigation settlement, amount awarded and not yet paid			$ 23
PAC | 2020 Wildfires | James case
Loss Contingencies [Line Items]
Damages sought								$ 7,000
Number of plaintiffs | plaintiff		17						17	17
Number of wildfires | wildfire								4
Multiplier								0.25
Number of trials | trial							3
Damages awarded, interest rate accrued per annum						9.00%
PAC | 2020 Wildfires | James case | Settled litigation
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff					5
PAC | 2020 Wildfires | James case, 1,000 class members | Subsequent event
Loss Contingencies [Line Items]
Number of plaintiffs | class_member	1,000			1,000
PAC | 2020 Wildfires | James case, 1,000 class members | Economic and property damages | Subsequent event
Loss Contingencies [Line Items]
Damages sought				$ 5,000
PAC | 2020 Wildfires | James case, 1,000 class members | Noneconomic damages | Subsequent event
Loss Contingencies [Line Items]
Damages sought				$ 25,000
PAC | 2020 Wildfires | James case, first trial
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff						9
Multiplier						0.25
PAC | 2020 Wildfires | James case, second trial
Loss Contingencies [Line Items]
Number of plaintiffs | plaintiff					10
Damages awarded					$ 42
Multiplier					0.25
PAC | 2020 Wildfires | James case, second trial | Economic and property damages
Loss Contingencies [Line Items]
Damages awarded					$ 12
PAC | 2020 Wildfires | James case, second trial | Noneconomic damages
Loss Contingencies [Line Items]
Damages awarded					23
PAC | 2020 Wildfires | James case, second trial | Punitive damages
Loss Contingencies [Line Items]
Damages awarded					7
PAC | Wildfires
Loss Contingencies [Line Items]
Accrued losses											0	400
Estimate of possible loss					2,407						2,407		2,407
Settlement payments											18	0
Estimated loss accrual, current					269						269		269	4
Settlement, proceeds											350	0
Wildfire losses, net of recoveries											0	$ 359
PAC | Wildfires | Other receivables
Loss Contingencies [Line Items]
Receivable, expected insurance recoveries					15						15		15	350
PAC | Wildfires | Other assets
Loss Contingencies [Line Items]
Receivable, expected insurance recoveries					$ 134						$ 134		$ 134	$ 149
PAC | 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
Fuel contracts | PAC
Loss Contingencies [Line Items]
Purchase obligation					$ 1,900						$ 1,900		$ 1,900