FAIR VALUE MEASUREMENTS - Book Values and Fair Values of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Book values
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Short-term debt	$ 4	$ 2,126
Current maturities of long-term debt and finance lease obligations	751	626
Long-term debt and finance lease obligations	8,747	10,374
Fair values
Fair Value And Carrying Value By Balance Sheet Grouping [Line Items]
Short-term debt	4	2,126
Current maturities of long-term debt and finance lease obligations	741	619
Long-term debt and finance lease obligations	$ 7,918	$ 9,295