FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets:
Short-term investments		$ 289
Price risk management instruments, netting	$ 61	143
Price risk management instruments, assets	325	370
TOTAL ASSETS	5,365	5,558
Liabilities:
Price risk management instruments, netting	(24)	(27)
TOTAL LIABILITIES	182	242
Amount primarily related to deferred taxes on appreciation of investment value	530	783
Short-term investments
Assets:
Short-term investments	160
Fixed-income securities
Assets:
Short-term investments	49
Nuclear decommissioning trusts
Assets:
Short-term investments	103	22
Global equity securities	1,690	2,504
Fixed-income securities	1,863	2,024
TOTAL ASSETS	3,679	4,581
Customer credit trust
Assets:
Short-term investments	7
Global equity securities	251
Fixed-income securities	616
TOTAL ASSETS	874
Rabbi trusts
Assets:
Short-term investments	25
Global equity securities	4
Fixed-income securities	68	104
Life insurance contracts	66	76
TOTAL ASSETS	163	180
Long-term disability trust
Assets:
Short-term investments	4	6
TOTAL ASSETS	115	138
Price Risk Derivative, Electricity
Assets:
Price risk management instruments, netting	22	6
Price risk management instruments, assets	259	229
Liabilities:
Price risk management instruments, netting	(22)	(24)
Price risk management instruments, liabilities	172	235
Price Risk Derivative, Gas
Assets:
Price risk management instruments, netting	39	137
Price risk management instruments, assets	66	141
Liabilities:
Price risk management instruments, netting	(2)	(3)
Price risk management instruments, liabilities	10	7
Level 1
Assets:
Short-term investments		289
Price risk management instruments, gross subject to netting	0	0
TOTAL ASSETS	3,481	3,979
Liabilities:
TOTAL LIABILITIES	0	0
Level 1 | Short-term investments
Assets:
Short-term investments	160
Level 1 | Fixed-income securities
Assets:
Short-term investments	0
Level 1 | Nuclear decommissioning trusts
Assets:
Short-term investments	103	22
Global equity securities	1,690	2,504
Fixed-income securities	1,057	1,158
TOTAL ASSETS	2,850	3,684
Level 1 | Customer credit trust
Assets:
Short-term investments	7
Global equity securities	251
Fixed-income securities	180
TOTAL ASSETS	438
Level 1 | Rabbi trusts
Assets:
Short-term investments	25
Global equity securities	4
Fixed-income securities	0	0
Life insurance contracts	0	0
TOTAL ASSETS	29	0
Level 1 | Long-term disability trust
Assets:
Short-term investments	4	6
TOTAL ASSETS	4	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	59	13
TOTAL ASSETS	1,484	1,059
Liabilities:
TOTAL LIABILITIES	32	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	806	866
TOTAL ASSETS	806	866
Level 2 | Customer credit trust
Assets:
Short-term investments	0
Global equity securities	0
Fixed-income securities	436
TOTAL ASSETS	436
Level 2 | Rabbi trusts
Assets:
Short-term investments	0
Global equity securities	0
Fixed-income securities	68	104
Life insurance contracts	66	76
TOTAL ASSETS	134	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	32	9
Liabilities:
Price risk management instruments, gross subject to netting	20	11
Level 2 | Price Risk Derivative, Gas
Assets:
Price risk management instruments, gross subject to netting	27	4
Liabilities:
Price risk management instruments, gross subject to netting	12	10
Level 3
Assets:
Short-term investments		0
Price risk management instruments, gross subject to netting	205	214
TOTAL ASSETS	205	214
Liabilities:
TOTAL LIABILITIES	174	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	205	214
Liabilities:
Price risk management instruments, gross subject to netting	174	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	23	31
Fair Value Measured at Net Asset Value Per Share | Long-term disability trust
Assets:
Assets measured at NAV	$ 111	$ 132