FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Assets:
Price risk management instruments, netting	$ (16)	$ 42
Price risk management instruments, assets	403	456
TOTAL ASSETS	7,404	5,501
Liabilities:
Price risk management instruments, netting	(16)	(54)
TOTAL LIABILITIES	303	278
Amount primarily related to deferred taxes on appreciation of investment value	747	717
Short-term investments
Assets:
Short-term investments	826	203
PERS
Assets:
Short-term investments	905
TOTAL ASSETS	905
Nuclear decommissioning trusts
Assets:
Short-term investments	53	52
Global equity securities	2,228	2,144
Fixed-income securities	2,277	2,077
TOTAL ASSETS	4,580	4,291
Customer credit trust
Assets:
Short-term investments	1	49
Global equity securities	186	71
Fixed-income securities	190	113
TOTAL ASSETS	377	233
Rabbi trusts
Assets:
Short-term investments	107	102
Global equity securities	6	5
Life insurance contracts	66	65
TOTAL ASSETS	179	172
Long-term disability trust
Assets:
Short-term investments	4	7
TOTAL ASSETS	134	146
Electricity
Assets:
Price risk management instruments, netting	(6)	(1)
Price risk management instruments, assets	403	410
Liabilities:
Price risk management instruments, netting	(6)	(6)
Price risk management instruments, liabilities	279	250
Gas
Assets:
Price risk management instruments, netting	(10)	43
Price risk management instruments, assets	0	46
Liabilities:
Price risk management instruments, netting	(10)	(48)
Price risk management instruments, liabilities	24	28
Level 1
Assets:
Price risk management instruments, gross subject to netting	0	0
TOTAL ASSETS	5,612	3,830
Liabilities:
TOTAL LIABILITIES	0	0
Level 1 | Short-term investments
Assets:
Short-term investments	826	203
Level 1 | PERS
Assets:
Short-term investments	905
TOTAL ASSETS	905
Level 1 | Nuclear decommissioning trusts
Assets:
Short-term investments	53	52
Global equity securities	2,228	2,144
Fixed-income securities	1,250	1,168
TOTAL ASSETS	3,531	3,364
Level 1 | Customer credit trust
Assets:
Short-term investments	1	49
Global equity securities	186	71
Fixed-income securities	46	29
TOTAL ASSETS	233	149
Level 1 | Rabbi trusts
Assets:
Short-term investments	107	102
Global equity securities	6	5
Life insurance contracts	0	0
TOTAL ASSETS	113	107
Level 1 | Long-term disability trust
Assets:
Short-term investments	4	7
TOTAL ASSETS	4	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	36	10
TOTAL ASSETS	1,273	1,068
Liabilities:
TOTAL LIABILITIES	71	119
Level 2 | Short-term investments
Assets:
Short-term investments	0	0
Level 2 | PERS
Assets:
Short-term investments	0
TOTAL ASSETS	0
Level 2 | Nuclear decommissioning trusts
Assets:
Short-term investments	0	0
Global equity securities	0	0
Fixed-income securities	1,027	909
TOTAL ASSETS	1,027	909
Level 2 | Customer credit trust
Assets:
Short-term investments	0	0
Global equity securities	0	0
Fixed-income securities	144	84
TOTAL ASSETS	144	84
Level 2 | Rabbi trusts
Assets:
Short-term investments	0	0
Global equity securities	0	0
Life insurance contracts	66	65
TOTAL ASSETS	66	65
Level 2 | Long-term disability trust
Assets:
Short-term investments	0	0
TOTAL ASSETS	0	0
Level 2 | Electricity
Assets:
Price risk management instruments, gross subject to netting	26	7
Liabilities:
Price risk management instruments, gross subject to netting	37	43
Level 2 | Gas
Assets:
Price risk management instruments, gross subject to netting	10	3
Liabilities:
Price risk management instruments, gross subject to netting	34	76
Level 3
Assets:
Price risk management instruments, gross subject to netting	383	404
TOTAL ASSETS	383	404
Liabilities:
TOTAL LIABILITIES	248	213
Level 3 | Short-term investments
Assets:
Short-term investments	0	0
Level 3 | PERS
Assets:
Short-term investments	0
TOTAL ASSETS	0
Level 3 | Nuclear decommissioning trusts
Assets:
Short-term investments	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	0	0
Global equity securities	0	0
Fixed-income securities	0	0
TOTAL ASSETS	0	0
Level 3 | Rabbi trusts
Assets:
Short-term investments	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	0	0
TOTAL ASSETS	0	0
Level 3 | Electricity
Assets:
Price risk management instruments, gross subject to netting	383	404
Liabilities:
Price risk management instruments, gross subject to netting	248	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	22	18
Assets measured at NAV | Long-term disability trust
Assets:
Assets measured at NAV	$ 130	$ 139