CONTINGENCIES (Environmental Obligations) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($) state project	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2017 USD ($) division site
Site Contingency [Line Items]
Number of remediation projects | project	80
Number of US States with remediation projects | state	20
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year	$ 1,939	$ 1,740	$ 1,664
Accretion Expense	131	119	110
Net additionsb	82	195	43
Spending	(112)	(115)	(77)
Balance at end of year	$ 2,040	$ 1,939	$ 1,740
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of environmental and asset retirement obligations	Current portion of environmental and asset retirement obligations	Current portion of environmental and asset retirement obligations
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Environmental and asset retirement obligations, less current portion	Environmental and asset retirement obligations, less current portion	Environmental and asset retirement obligations, less current portion
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]	Liabilities	Liabilities	Liabilities
Less current portion	$ (131)	$ (131)	$ (125)
Long-term portion	1,909	1,808	1,615
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
2024	131
2025	111
2026	122
2027	112
2028	77
Thereafter	3,800
Estimated environmental obligations on a discounted basis	1,900
Estimated environmental obligations on an undiscounted and unescalated	$ 4,400
Environmental Loss Contingency, Number of Uranium Sites on Tribal Lands | division				94
Remediation work related to Uranium mines, amount to be contributed by the U.S. Government				$ 335
Uranium mine remediation work, program term, in years				20 years
Number of site surveys being performed to mining claims | site				15,000
Active remediation projects, percent	85.00%
Revisions to cash flow estimates and settlements, net	$ 635	54	$ 381
Minimum
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
Estimated environmental obligations on an undiscounted and unescalated	3,900
Maximum
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
Estimated environmental obligations on an undiscounted and unescalated	5,100
Pinal Creek, AZ; Newtown Creek, NY; Smelter Sites in Arizona, Indiana, Kansas, Missouri, New Jersey, Oklahoma, Pennsylvania; and Uranium Mining in Wester United States
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at end of year	1,700
Newtown Creek
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at end of year	452
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)		$ 64
Pinal Creek, AZ
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at end of year	517
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
Accrual for Environmental Loss Contingencies, Period Increase (Decrease)	61
Historical Smelter Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at end of year	266
Uranium Mining Sites
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at end of year	$ 473