Commitments and Contingencies - Schedule of Expected Recoveries (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Commitments and Contingencies
Estimated recoveries received and expected to receive	$ 4,711
Insurance recoveries, through electric rates	1,936	$ 647
2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	3,781
Insurance recoveries, through electric rates	1,396	64
Other Wildfire Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	930
Insurance recoveries, through electric rates	540	583
Insurance Recoveries
Commitments and Contingencies
Estimated recoveries received and expected to receive	2,800
Insurance Recoveries | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	2,000
Insurance Recoveries | Other Wildfire Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	800
FERC Recoveries
Commitments and Contingencies
Estimated recoveries received and expected to receive	462
FERC Recoveries | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	440
FERC Recoveries | Other Wildfire Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	22
CPUC- RMBA Recoveries
Commitments and Contingencies
Estimated recoveries received and expected to receive	12
CPUC- RMBA Recoveries | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	0
CPUC- RMBA Recoveries | Other Wildfire Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	12
CPUC-WEMA Deferral
Commitments and Contingencies
Estimated recoveries received and expected to receive	1,437
CPUC-WEMA Deferral | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	1,341
CPUC-WEMA Deferral | Other Wildfire Events
Commitments and Contingencies
Estimated recoveries received and expected to receive	96
Long-Term Insurance Receivables
Commitments and Contingencies
Insurance recoveries, through electric rates	422	434
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	422	434
FERC Related Balancing Accounts
Commitments and Contingencies
Insurance recoveries, through electric rates	77	73
FERC Related Balancing Accounts | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries, through electric rates	55	64
FERC Related Balancing Accounts | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries, through electric rates	22	9
CPUC-WEMA
Commitments and Contingencies
Insurance recoveries, through electric rates	1,437	140
CPUC-WEMA | 2017/2018 Wildfire/Mudslide Events
Commitments and Contingencies
Insurance recoveries, through electric rates	1,341	0
CPUC-WEMA | Other Wildfire Events
Commitments and Contingencies
Insurance recoveries, through electric rates	$ 96	$ 140