FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets:
Price risk management instruments, netting	$ 20	$ 367
Price risk management instruments, assets	406	1,497
TOTAL ASSETS	6,074	7,127
Liabilities:
Price risk management instruments, netting	(28)	(186)
TOTAL LIABILITIES	216	229
Amount primarily related to deferred taxes on appreciation of investment value	654	575
Short-term investments
Assets:
Short-term investments	723	658
Fixed-income securities
Assets:
Short-term investments		49
Nuclear decommissioning trusts
Assets:
Short-term investments	126	117
Global equity securities	2,035	1,845
Fixed-income securities	1,988	1,885
TOTAL ASSETS	4,178	3,872
Customer credit trust
Assets:
Short-term investments	7	19
Global equity securities	148	218
Fixed-income securities	321	508
TOTAL ASSETS	476	745
Rabbi trusts
Assets:
Short-term investments	97	25
Global equity securities	5	5
Fixed-income securities		69
Life insurance contracts	65	64
TOTAL ASSETS	167	163
Long-term disability trust
Assets:
Short-term investments	7	10
TOTAL ASSETS	124	143
Price Risk Derivative, Electricity
Assets:
Price risk management instruments, netting	11	40
Price risk management instruments, assets	369	566
Liabilities:
Price risk management instruments, netting	(26)	(20)
Price risk management instruments, liabilities	209	223
Price Risk Derivative, Gas
Assets:
Price risk management instruments, netting	9	327
Price risk management instruments, assets	37	931
Liabilities:
Price risk management instruments, netting	(2)	(166)
Price risk management instruments, liabilities	7	6
Level 1
Assets:
Price risk management instruments, gross subject to netting	0	0
TOTAL ASSETS	4,428	4,207
Liabilities:
TOTAL LIABILITIES	0	0
Level 1 | Short-term investments
Assets:
Short-term investments	723	658
Level 1 | Fixed-income securities
Assets:
Short-term investments		0
Level 1 | Nuclear decommissioning trusts
Assets:
Short-term investments	126	117
Global equity securities	2,035	1,845
Fixed-income securities	1,195	1,094
TOTAL ASSETS	3,356	3,056
Level 1 | Customer credit trust
Assets:
Short-term investments	7	19
Global equity securities	148	218
Fixed-income securities	85	216
TOTAL ASSETS	240	453
Level 1 | Rabbi trusts
Assets:
Short-term investments	97	25
Global equity securities	5	5
Fixed-income securities		0
Life insurance contracts	0	0
TOTAL ASSETS	102	30
Level 1 | Long-term disability trust
Assets:
Short-term investments	7	10
TOTAL ASSETS	7	10
Level 1 | Price Risk Derivative, 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 | Price Risk Derivative, 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	56	698
TOTAL ASSETS	1,150	1,963
Liabilities:
TOTAL LIABILITIES	40	182
Level 2 | Short-term investments
Assets:
Short-term investments	0	0
Level 2 | Fixed-income securities
Assets:
Short-term investments		49
Level 2 | Nuclear decommissioning trusts
Assets:
Short-term investments	0	0
Global equity securities	0	0
Fixed-income securities	793	791
TOTAL ASSETS	793	791
Level 2 | Customer credit trust
Assets:
Short-term investments	0	0
Global equity securities	0	0
Fixed-income securities	236	292
TOTAL ASSETS	236	292
Level 2 | Rabbi trusts
Assets:
Short-term investments	0	0
Global equity securities	0	0
Fixed-income securities		69
Life insurance contracts	65	64
TOTAL ASSETS	65	133
Level 2 | Long-term disability trust
Assets:
Short-term investments	0	0
TOTAL ASSETS	0	0
Level 2 | Price Risk Derivative, Electricity
Assets:
Price risk management instruments, gross subject to netting	28	94
Liabilities:
Price risk management instruments, gross subject to netting	31	10
Level 2 | Price Risk Derivative, Gas
Assets:
Price risk management instruments, gross subject to netting	28	604
Liabilities:
Price risk management instruments, gross subject to netting	9	172
Level 3
Assets:
Price risk management instruments, gross subject to netting	330	432
TOTAL ASSETS	330	432
Liabilities:
TOTAL LIABILITIES	204	233
Level 3 | Short-term investments
Assets:
Short-term investments	0	0
Level 3 | Fixed-income securities
Assets:
Short-term investments		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
Fixed-income securities		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 | Price Risk Derivative, Electricity
Assets:
Price risk management instruments, gross subject to netting	330	432
Liabilities:
Price risk management instruments, gross subject to netting	204	233
Level 3 | Price Risk Derivative, Gas
Assets:
Price risk management instruments, gross subject to netting	0	0
Liabilities:
Price risk management instruments, gross subject to netting	0	0
Fair Value Measured at Net Asset Value Per Share | Nuclear decommissioning trusts
Assets:
Assets measured at NAV	29	25
Fair Value Measured at Net Asset Value Per Share | Long-term disability trust
Assets:
Assets measured at NAV	$ 117	$ 133