FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Assets:
Short-term investments		$ 289
Price risk management instruments, netting	$ 367	143
Price risk management instruments, assets	1,497	370
TOTAL ASSETS	7,127	5,558
Liabilities:
Price risk management instruments, netting	(186)	(27)
TOTAL LIABILITIES	229	242
Amount primarily related to deferred taxes on appreciation of investment value	575	783
Short-term investments
Assets:
Short-term investments	658
Fixed-income securities
Assets:
Short-term investments	49
Nuclear decommissioning trusts
Assets:
Short-term investments	117	22
Global equity securities	1,845	2,504
Fixed-income securities	1,885	2,024
TOTAL ASSETS	3,872	4,581
Customer credit trust
Assets:
Short-term investments	19
Global equity securities	218
Fixed-income securities	508
TOTAL ASSETS	745
Rabbi trusts
Assets:
Short-term investments	25
Global equity securities	5
Fixed-income securities	69	104
Life insurance contracts	64	76
TOTAL ASSETS	163	180
Long-term disability trust
Assets:
Short-term investments	10	6
TOTAL ASSETS	143	138
Price Risk Derivative, Electricity
Assets:
Price risk management instruments, netting	40	6
Price risk management instruments, assets	566	229
Liabilities:
Price risk management instruments, netting	(20)	(24)
Price risk management instruments, liabilities	223	235
Price Risk Derivative, Gas
Assets:
Price risk management instruments, netting	327	137
Price risk management instruments, assets	931	141
Liabilities:
Price risk management instruments, netting	(166)	(3)
Price risk management instruments, liabilities	6	7
Level 1
Assets:
Short-term investments		289
Price risk management instruments, gross subject to netting	0	0
TOTAL ASSETS	4,207	3,979
Liabilities:
TOTAL LIABILITIES	0	0
Level 1 | Short-term investments
Assets:
Short-term investments	658
Level 1 | Fixed-income securities
Assets:
Short-term investments	0
Level 1 | Nuclear decommissioning trusts
Assets:
Short-term investments	117	22
Global equity securities	1,845	2,504
Fixed-income securities	1,094	1,158
TOTAL ASSETS	3,056	3,684
Level 1 | Customer credit trust
Assets:
Short-term investments	19
Global equity securities	218
Fixed-income securities	216
TOTAL ASSETS	453
Level 1 | Rabbi trusts
Assets:
Short-term investments	25
Global equity securities	5
Fixed-income securities	0	0
Life insurance contracts	0	0
TOTAL ASSETS	30	0
Level 1 | Long-term disability trust
Assets:
Short-term investments	10	6
TOTAL ASSETS	10	6
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:
Short-term investments		0
Price risk management instruments, gross subject to netting	698	13
TOTAL ASSETS	1,963	1,059
Liabilities:
TOTAL LIABILITIES	182	21
Level 2 | Short-term investments
Assets:
Short-term investments	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	791	866
TOTAL ASSETS	791	866
Level 2 | Customer credit trust
Assets:
Short-term investments	0
Global equity securities	0
Fixed-income securities	292
TOTAL ASSETS	292
Level 2 | Rabbi trusts
Assets:
Short-term investments	0
Global equity securities	0
Fixed-income securities	69	104
Life insurance contracts	64	76
TOTAL ASSETS	133	180
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	94	9
Liabilities:
Price risk management instruments, gross subject to netting	10	11
Level 2 | Price Risk Derivative, Gas
Assets:
Price risk management instruments, gross subject to netting	604	4
Liabilities:
Price risk management instruments, gross subject to netting	172	10
Level 3
Assets:
Short-term investments		0
Price risk management instruments, gross subject to netting	432	214
TOTAL ASSETS	432	214
Liabilities:
TOTAL LIABILITIES	233	248
Level 3 | Short-term investments
Assets:
Short-term investments	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
Global equity securities	0
Fixed-income securities	0
TOTAL ASSETS	0
Level 3 | Rabbi trusts
Assets:
Short-term investments	0
Global equity securities	0
Fixed-income 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 | Price Risk Derivative, Electricity
Assets:
Price risk management instruments, gross subject to netting	432	214
Liabilities:
Price risk management instruments, gross subject to netting	233	248
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	25	31
Fair Value Measured at Net Asset Value Per Share | Long-term disability trust
Assets:
Assets measured at NAV	$ 133	$ 132