SAN ONOFRE NUCLEAR GENERATING STATION - NUCLEAR DECOMMISSIONING TRUSTS (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost	$ 689	$ 735
Gross unrealized gains	196	282
Gross unrealized losses	(44)	(5)
Estimated fair value	841	1,012
Proceeds from sales	639	961	$ 1,439
Gross realized gains	18	67	156
Gross realized losses	(20)	(5)	$ (17)
Domestic government and government agencies
Debt Securities, Available-for-sale [Line Items]
Cost	40	56
Gross unrealized gains	1	0
Gross unrealized losses	(1)	0
Estimated fair value	40	56
Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Cost	283	309
Gross unrealized gains	1	13
Gross unrealized losses	(14)	(1)
Estimated fair value	270	321
Other securities
Debt Securities, Available-for-sale [Line Items]
Cost	248	255
Gross unrealized gains	0	7
Gross unrealized losses	(21)	(2)
Estimated fair value	227	260
Debt Securities
Debt Securities, Available-for-sale [Line Items]
Cost	571	620
Gross unrealized gains	2	20
Gross unrealized losses	(36)	(3)
Estimated fair value	537	637
Equity securities
Debt Securities, Available-for-sale [Line Items]
Cost	111	104
Gross unrealized gains	194	262
Gross unrealized losses	(8)	(2)
Estimated fair value	297	364
Cash and cash equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	11	3
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	11	3
Accounts Payable
Debt Securities, Available-for-sale [Line Items]
Cost	(4)	8
Gross unrealized gains	0	0
Gross unrealized losses	0	0
Estimated fair value	$ (4)	$ 8