ENVIRONMENTAL LIABILITIES AND EXPENDITURES - Current and Non-Current Environmental Remediation Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Current Portion:
Accrued liabilities	$ 151	$ 150
Non-Current Portion:
Deferred credits and other liabilities	1,719	1,759
Total current and non-current	$ 1,870	1,909
Environmental loss contingency, current, statement of financial position	Accrued liabilities
Continuing operations
Current Portion:
Accrued liabilities	$ 55	55
Non-Current Portion:
Deferred credits and other liabilities	141	170
Total current and non-current	196	225
Discontinued Operations
Current Portion:
Accrued liabilities	96	95
Non-Current Portion:
Deferred credits and other liabilities	1,578	1,589
Total current and non-current	$ 1,674	$ 1,684