Commitment and Contingencies - Summary of Expected Recoveries (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Commitments and Contingencies
Insurance recoveries	$ 3,335
Insurance recoveries, through electric rates	647	$ 703
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries	2,440
Insurance recoveries, through electric rates	64	37
Other Wildfire Events
Commitments and Contingencies
Insurance recoveries	895
Insurance recoveries, through electric rates	583	666
Insurance recoveries
Commitments and Contingencies
Insurance recoveries	2,718
Insurance recoveries | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries	2,000
Insurance recoveries | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries	718
FERC recoveries
Commitments and Contingencies
Insurance recoveries	465
FERC recoveries | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries	440
FERC recoveries | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries	25
CPUC- RMBA recoveries
Commitments and Contingencies
Insurance recoveries	12
CPUC- RMBA recoveries | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries	0
CPUC- RMBA recoveries | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries	12
CPUC-WEMA deferral
Commitments and Contingencies
Insurance recoveries	140
CPUC-WEMA deferral | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries	0
CPUC-WEMA deferral | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries	140
Long-term insurance receivables
Commitments and Contingencies
Insurance recoveries, through electric rates	434	512
Long-term insurance receivables | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries, through electric rates	0	0
Long-term insurance receivables | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries, through electric rates	434	512
FERC related balancing accounts
Commitments and Contingencies
Insurance recoveries, through electric rates	73	51
FERC related balancing accounts | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries, through electric rates	64	37
FERC related balancing accounts | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries, through electric rates	9	14
CPUC-WEMA
Commitments and Contingencies
Insurance recoveries, through electric rates	140	140
CPUC-WEMA | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries, through electric rates	0	0
CPUC-WEMA | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries, through electric rates	$ 140	$ 140