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RETIREMENT BENEFITS PLANS - Fair Value of Pension Plan Assets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Defined Benefit Plan Disclosure [Line Items]    
United States pension plans percentage of worldwide pension assets 59.00%  
United Kingdom pension plans percentage of worldwide pension assets 26.00%  
United States pension plans' target allocation of United States equities 21.00%  
United States pension plans' target allocation of non-United States equities 11.00%  
United States pension plans' target allocation of real estate 4.00%  
United State pension plans' target allocation of debt securities 46.00%  
United States pension plans' target allocation of other, including private equity, private debt, and cash equivalents 18.00%  
United Kingdom pension plans' target allocation of equities 16.00%  
Total pension plan assets $ 4,191 $ 3,993
Pending purchases and sales of plan assets, and interest receivable (67) (85)
Unfunded commitments 158 128
Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 485 662
Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1,999 1,952
Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 485 486
Non-United States equity and global equities | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 211 241
Non-United States equity and global equities | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Non-United States equity and global equities | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 211 241
Non-United States equity and global equities | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Fixed income | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 32 28
Fixed income | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Fixed income | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 32 28
Fixed income | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Fixed income securities | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1,647 1,582
Fixed income securities | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Fixed income securities | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1,647 1,582
Fixed income securities | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
United States treasuries | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 258 461
United States treasuries | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 255 453
United States treasuries | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 3 8
United States treasuries | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Real estate | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 248 212
Real estate | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 100 63
Real estate | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 32 25
Real estate | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 116 124
Cash equivalents | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 49 83
Cash equivalents | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 25 55
Cash equivalents | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 24 28
Cash equivalents | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Exchange traded funds | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 105 91
Exchange traded funds | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 105 91
Exchange traded funds | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Exchange traded funds | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Other | Fair Value, Inputs, Level 1, 2 and 3    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 419 402
Other | Quoted prices in active markets for identical assets (Level 1)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 0 0
Other | Other observable inputs (Level 2)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 50 40
Other | Unobservable inputs (Level 3)    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 369 362
Common collective and other trusts measured at net asset value | Fair Value Measured at Net Asset Value Per Share    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets 1,287 $ 978
Money market funds measured at net asset value | Fair Value Measured at Net Asset Value Per Share    
Defined Benefit Plan Disclosure [Line Items]    
Total pension plan assets $ 2