COMPREHENSIVE INCOME (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 32,218	$ 26,986
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(14)	24
Ending balance	32,978	27,364
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	36	(3)
Change in Fair Value Recognized in AOCI, Net of Tax	25	37
Amount of (Gain) Loss Reclassified from AOCI	(49)	(17)
Income Tax Expense	(10)	(4)
Reclassifications from AOCI, Net of Income Tax Expense	(39)	(13)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(14)	24
Ending balance	22	21
Pension and OPEB Amortization of Deferred Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(41)	(105)
Change in Fair Value Recognized in AOCI, Net of Tax	0	0
Amount of (Gain) Loss Reclassified from AOCI	1	1
Income Tax Expense	0	0
Reclassifications from AOCI, Net of Income Tax Expense	1	1
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	1	1
Ending balance	(40)	(104)
Amortization of Actuarial (Gains) Losses
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Amount of (Gain) Loss Reclassified from AOCI	1	1
Commodity | Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	78	99
Change in Fair Value Recognized in AOCI, Net of Tax	25	38
Amount of (Gain) Loss Reclassified from AOCI	(50)	(17)
Income Tax Expense	(10)	(4)
Reclassifications from AOCI, Net of Income Tax Expense	(40)	(13)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	(15)	25
Ending balance	63	124
Interest Rate | Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1)	3
Change in Fair Value Recognized in AOCI, Net of Tax	0	(1)
Amount of (Gain) Loss Reclassified from AOCI	0	(1)
Income Tax Expense	0	0
Reclassifications from AOCI, Net of Income Tax Expense	0	(1)
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	0	(2)
Ending balance	$ (1)	$ 1