FAIR VALUE MEASUREMENTS (Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets:
Price risk management instruments, netting	$ 42	$ 367
Price risk management instruments, assets	456	1,497
TOTAL ASSETS	5,501	7,127
Liabilities:
Price risk management instruments, netting	(54)	(186)
TOTAL LIABILITIES	278	229
Amount primarily related to deferred taxes on appreciation of investment value	717	575
Short-term investments
Assets:
Short-term investments	203	658
Fixed-income securities
Assets:
Short-term investments		49
Nuclear decommissioning trusts
Assets:
Short-term investments	52	117
Global equity securities	2,144	1,845
Fixed-income securities	2,077	1,885
TOTAL ASSETS	4,291	3,872
Customer credit trust
Assets:
Short-term investments	49	19
Global equity securities	71	218
Fixed-income securities	113	508
TOTAL ASSETS	233	745
Rabbi trusts
Assets:
Short-term investments	102	25
Global equity securities	5	5
Fixed-income securities		69
Life insurance contracts	65	64
TOTAL ASSETS	172	163
Long-term disability trust
Assets:
Short-term investments	7	10
TOTAL ASSETS	146	143
Electricity
Assets:
Price risk management instruments, netting	(1)	40
Price risk management instruments, assets	410	566
Liabilities:
Price risk management instruments, netting	(6)	(20)
Price risk management instruments, liabilities	250	223
Gas
Assets:
Price risk management instruments, netting	43	327
Price risk management instruments, assets	46	931
Liabilities:
Price risk management instruments, netting	(48)	(166)
Price risk management instruments, liabilities	28	6
Level 1
Assets:
Price risk management instruments, gross subject to netting	0	0
TOTAL ASSETS	3,830	4,207
Liabilities:
TOTAL LIABILITIES	0	0
Level 1 | Short-term investments
Assets:
Short-term investments	203	658
Level 1 | Fixed-income securities
Assets:
Short-term investments		0
Level 1 | Nuclear decommissioning trusts
Assets:
Short-term investments	52	117
Global equity securities	2,144	1,845
Fixed-income securities	1,168	1,094
TOTAL ASSETS	3,364	3,056
Level 1 | Customer credit trust
Assets:
Short-term investments	49	19
Global equity securities	71	218
Fixed-income securities	29	216
TOTAL ASSETS	149	453
Level 1 | Rabbi trusts
Assets:
Short-term investments	102	25
Global equity securities	5	5
Fixed-income securities		0
Life insurance contracts	0	0
TOTAL ASSETS	107	30
Level 1 | Long-term disability trust
Assets:
Short-term investments	7	10
TOTAL ASSETS	7	10
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	10	698
TOTAL ASSETS	1,068	1,963
Liabilities:
TOTAL LIABILITIES	119	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	909	791
TOTAL ASSETS	909	791
Level 2 | Customer credit trust
Assets:
Short-term investments	0	0
Global equity securities	0	0
Fixed-income securities	84	292
TOTAL ASSETS	84	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 | Electricity
Assets:
Price risk management instruments, gross subject to netting	7	94
Liabilities:
Price risk management instruments, gross subject to netting	43	10
Level 2 | Gas
Assets:
Price risk management instruments, gross subject to netting	3	604
Liabilities:
Price risk management instruments, gross subject to netting	76	172
Level 3
Assets:
Price risk management instruments, gross subject to netting	404	432
TOTAL ASSETS	404	432
Liabilities:
TOTAL LIABILITIES	213	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 | Electricity
Assets:
Price risk management instruments, gross subject to netting	404	432
Liabilities:
Price risk management instruments, gross subject to netting	213	233
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	18	25
Assets measured at NAV | Long-term disability trust
Assets:
Assets measured at NAV	$ 139	$ 133