DERIVATIVES - Schedule of Gains and Losses on Derivative Instruments Included in Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net:	$ (182)		$ 120	$ (16)	$ 149
Net cash received (paid) on settlements:	(97)		60	149	108
Gain (loss) on derivative instruments, net	(182)		120	(16)	149
Commodity contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net:	(182)		115	(16)	126
Net cash received (paid) on settlements:	(97)		72	176	181
Gain (loss) on derivative instruments, net				1
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net:	0		0	0	18
Net cash received (paid) on settlements:	0		(15)	(27)	(75)
2026 WTI Contingent Liability
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net:	0		2	0	3
Treasury locks
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) on derivative instruments, net:	0		3	0	2
Net cash received (paid) on settlements:	$ 0		3	0	2
Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Payments for derivative instruments terminated and settled		$ 27
Gain (loss) on derivative instruments, net			$ (15)	$ (27)	$ (67)