v3.25.4
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS - Schedule of Fair Value of Pension Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 1,746 $ 1,773
Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 7 4
Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,064 1,401
Significant unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4 6
Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4 6
Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 671 362
Cash and cash equivalents | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 143 146
Cash and cash equivalents | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Cash and cash equivalents | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 143 146
Cash and cash equivalents | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Cash and cash equivalents | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Government and government agency securities, U.S. securities | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 124 57
Government and government agency securities, U.S. securities | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Government and government agency securities, U.S. securities | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 124 57
Government and government agency securities, U.S. securities | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Government and government agency securities, U.S. securities | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Government and government agency securities, International securities | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 32 43
Government and government agency securities, International securities | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Government and government agency securities, International securities | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 32 43
Government and government agency securities, International securities | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Government and government agency securities, International securities | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Corporate bonds and notes, U.S. companies | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 566 909
Corporate bonds and notes, U.S. companies | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Corporate bonds and notes, U.S. companies | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 566 909
Corporate bonds and notes, U.S. companies | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Corporate bonds and notes, U.S. companies | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Corporate bonds and notes, international companies | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 73 105
Corporate bonds and notes, international companies | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Corporate bonds and notes, international companies | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 73 105
Corporate bonds and notes, international companies | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Corporate bonds and notes, international companies | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Equity securities, International companies | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6 4
Equity securities, International companies | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 6 4
Equity securities, International companies | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Equity securities, International companies | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Equity securities, International companies | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Mutual funds | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 104 100
Mutual funds | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Mutual funds | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 104 100
Mutual funds | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Mutual funds | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, U.S. equity securities | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 538 234
Investments at net asset value, U.S. equity securities | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, U.S. equity securities | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, U.S. equity securities | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, U.S. equity securities | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 538 234
Investments at net asset value, International equity securities | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 133 128
Investments at net asset value, International equity securities | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, International equity securities | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, International equity securities | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, International equity securities | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 133 128
Investments at net asset value, U.S. private equity investments | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4 6
Investments at net asset value, U.S. private equity investments | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, U.S. private equity investments | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, U.S. private equity investments | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 4 6
Investments at net asset value, U.S. private equity investments | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, Emerging growth | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, Emerging growth | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, Emerging growth | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, Emerging growth | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
Investments at net asset value, Emerging growth | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
All other investments | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 23 41
All other investments | Quoted prices (Level 1) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1 0
All other investments | Other significant observable inputs (Level 2) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 22 41
All other investments | Significant unobservable inputs (Level 3) | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 0 0
All other investments | Net Asset Value | Fair Value, Measurements, Recurring | Pension Benefits    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 0 $ 0