CONTINGENCIES (Environmental Obligations) (Details) $ in Millions		12 Months Ended
	Jan. 17, 2017 USD ($) divisions site	Dec. 31, 2021 USD ($) project state	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 29, 2021 divisions
Site Contingency [Line Items]
Number of remediation projects | project		100
Number of US States with remediation projects | state		24
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at beginning of year		$ 1,584	$ 1,561	$ 1,511
Accretion Expense		104	102	102
Additionsb		60	38	23
Reductions		(20)	(58)	(1)
Spending		(64)	(59)	(74)
Balance at end of year		1,664	1,584	1,561
Less current portion		(64)	(83)	(106)
Long-term portion		1,600	$ 1,501	$ 1,455
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
2022		89
2023		80
2024		105
2025		98
2026		100
Thereafter		3,200
Estimated environmental obligations on a discounted basis		1,500
Estimated environmental obligations on an undiscounted and unescalated		3,700
Environmental Loss Contingency, Number of Uranium Sites on Tribal Lands | divisions	94				23
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
Reduction of environmental obligation due to deceleration of work cause by COVID-19		$ 47
Number of site surveys being performed to mining claims | site	15,000
Active remediation projects, percent		60.00%
Minimum
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
Estimated environmental obligations on an undiscounted and unescalated		$ 3,300
Maximum
Estimated environmental cash payments (on an undiscounted and unescalated basis) [Abstract]
Estimated environmental obligations on an undiscounted and unescalated		4,200
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		1,400
Newtown Creek
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at end of year		318
Sixty Percent of Remediation Projects
Accrual for Environmental Loss Contingencies [Roll Forward]
Balance at end of year		$ 20