Summary of Significant Accounting Policies (Cash) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Restricted Cash and Cash Equivalents
Money market funds	$ 397	$ 199
Cash and cash equivalents	465	345
Short-term restricted cash	$ 39	$ 35
Restricted Cash, Current, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current	Other Assets, Current
Long-term restricted cash	$ 295	$ 152
Restricted Cash, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Total cash, cash equivalents, and restricted cash	$ 799	$ 532	$ 198	$ 917
SCE
Restricted Cash and Cash Equivalents
Money market funds	10	78
Cash and cash equivalents	68	214
Short-term restricted cash	$ 34	$ 33
Restricted Cash, Current, Statement of Financial Position [Extensible Enumeration]	Other Assets, Current	Other Assets, Current
Long-term restricted cash	$ 294	$ 151
Restricted Cash, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other Assets, Noncurrent	Other Assets, Noncurrent
Total cash, cash equivalents, and restricted cash	$ 396	$ 398	$ 68	$ 766