SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Environmental, Litigation, Tax and Other Reserves (Details) - Environmental Litigation Tax And Other Reserves - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Valuation and qualifying accounts
Balance - beginning of year	$ 2,551	$ 2,452	$ 2,339
Charged to costs and expenses	95	105	275
Charged to other accounts	208	131	24
Payments	(81)	(137)	(186)
Balance - end of year	2,773	2,551	2,452
Environmental litigation tax and other reserves, current	$ 140	$ 109	$ 113