FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets:
Price risk management instruments, netting	$ (1)	$ 42
Price risk management instruments, assets	409	456
TOTAL ASSETS	6,262	5,501
Liabilities:
Price risk management instruments, netting	(8)	(54)
TOTAL LIABILITIES	284	278
Amount primarily related to deferred taxes on appreciation of investment value	757	717
Short-term investments (2)
Assets:
Short-term investments (2)	567	203
Short-term investments (2) | Wildfire self-insurance
Assets:
Short-term investments (2)	438
Nuclear decommissioning trusts
Assets:
Short-term investments (2)	37	52
Global equity securities	2,283	2,144
Fixed-income securities	2,128	2,077
TOTAL ASSETS	4,468	4,291
Customer credit trust
Assets:
Short-term investments (2)	351	49
Global equity securities	47	71
Fixed-income securities	109	113
TOTAL ASSETS	507	233
Rabbi trusts
Assets:
Short-term investments (2)	103	102
Global equity securities	5	5
Life insurance contracts	65	65
TOTAL ASSETS	173	172
Long-term disability trust
Assets:
Short-term investments (2)	7	7
TOTAL ASSETS	138	146
Electricity
Assets:
Price risk management instruments, netting	0	(1)
Price risk management instruments, assets	400	410
Liabilities:
Price risk management instruments, netting	(6)	(6)
Price risk management instruments, liabilities	283	250
Gas
Assets:
Price risk management instruments, netting	(1)	43
Price risk management instruments, assets	9	46
Liabilities:
Price risk management instruments, netting	(2)	(48)
Price risk management instruments, liabilities	1	28
Level 1
Assets:
Price risk management instruments, gross subject to netting	0	0
TOTAL ASSETS	4,556	3,830
Liabilities:
TOTAL LIABILITIES	0	0
Level 1 | Short-term investments (2)
Assets:
Short-term investments (2)	567	203
Level 1 | Nuclear decommissioning trusts
Assets:
Short-term investments (2)	37	52
Global equity securities	2,283	2,144
Fixed-income securities	1,135	1,168
TOTAL ASSETS	3,455	3,364
Level 1 | Customer credit trust
Assets:
Short-term investments (2)	351	49
Global equity securities	47	71
Fixed-income securities	21	29
TOTAL ASSETS	419	149
Level 1 | Rabbi trusts
Assets:
Short-term investments (2)	103	102
Global equity securities	5	5
Life insurance contracts	0	0
TOTAL ASSETS	108	107
Level 1 | Long-term disability trust
Assets:
Short-term investments (2)	7	7
TOTAL ASSETS	7	7
Level 1 | Electricity
Assets:
Price risk management instruments, gross subject to netting	0	0
Liabilities:
Price risk management instruments, gross subject to netting	0	0
Level 1 | Gas
Assets:
Price risk management instruments, gross subject to netting	0	0
Liabilities:
Price risk management instruments, gross subject to netting	0	0
Level 2
Assets:
Price risk management instruments, gross subject to netting	25	10
TOTAL ASSETS	1,171	1,068
Liabilities:
TOTAL LIABILITIES	52	119
Level 2 | Short-term investments (2)
Assets:
Short-term investments (2)	0	0
Level 2 | Nuclear decommissioning trusts
Assets:
Short-term investments (2)	0	0
Global equity securities	0	0
Fixed-income securities	993	909
TOTAL ASSETS	993	909
Level 2 | Customer credit trust
Assets:
Short-term investments (2)	0	0
Global equity securities	0	0
Fixed-income securities	88	84
TOTAL ASSETS	88	84
Level 2 | Rabbi trusts
Assets:
Short-term investments (2)	0	0
Global equity securities	0	0
Life insurance contracts	65	65
TOTAL ASSETS	65	65
Level 2 | Long-term disability trust
Assets:
Short-term investments (2)	0	0
TOTAL ASSETS	0	0
Level 2 | Electricity
Assets:
Price risk management instruments, gross subject to netting	15	7
Liabilities:
Price risk management instruments, gross subject to netting	49	43
Level 2 | Gas
Assets:
Price risk management instruments, gross subject to netting	10	3
Liabilities:
Price risk management instruments, gross subject to netting	3	76
Level 3
Assets:
Price risk management instruments, gross subject to netting	385	404
TOTAL ASSETS	385	404
Liabilities:
TOTAL LIABILITIES	240	213
Level 3 | Short-term investments (2)
Assets:
Short-term investments (2)	0	0
Level 3 | Nuclear decommissioning trusts
Assets:
Short-term investments (2)	0	0
Global equity securities	0	0
Fixed-income securities	0	0
TOTAL ASSETS	0	0
Level 3 | Customer credit trust
Assets:
Short-term investments (2)	0	0
Global equity securities	0	0
Fixed-income securities	0	0
TOTAL ASSETS	0	0
Level 3 | Rabbi trusts
Assets:
Short-term investments (2)	0	0
Global equity securities	0	0
Life insurance contracts	0	0
TOTAL ASSETS	0	0
Level 3 | Long-term disability trust
Assets:
Short-term investments (2)	0	0
TOTAL ASSETS	0	0
Level 3 | Electricity
Assets:
Price risk management instruments, gross subject to netting	385	404
Liabilities:
Price risk management instruments, gross subject to netting	240	213
Level 3 | Gas
Assets:
Price risk management instruments, gross subject to netting	0	0
Liabilities:
Price risk management instruments, gross subject to netting	0	0
Assets measured at NAV | Nuclear decommissioning trusts
Assets:
Assets measured at NAV	20	18
Assets measured at NAV | Long-term disability trust
Assets:
Assets measured at NAV	$ 131	$ 139