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EMPLOYEE BENEFIT PLANS - Fair Values of Pension Plans (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ 451 $ 591 $ 3,294
Disposal Group, Held-for-sale, Not Discontinued Operations | Chubb Fire and Security      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount   2,600  
Level 1 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 152 179  
Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 300 400  
Defined Benefit Plan Assets, Excluding Other Assets and Liabilities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 452 579  
Global Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 27 29  
Global Equities | Level 1 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Global Equities | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 27 29  
Global Equities | Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Global Equity Funds at net asset value | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 119 208  
Global Equity Funds at net asset value | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 119 208  
Governments | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 59 26  
Governments | Level 1 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Governments | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 35 26  
Governments | Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Governments | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 24    
Corporate Bonds | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 45 103  
Corporate Bonds | Level 1 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Corporate Bonds | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 45 103  
Corporate Bonds | Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Fixed Income Securities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 167 189  
Fixed Income Securities | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 11    
Fixed Income Securities | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 156 189  
Real Estate | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 1 9  
Real Estate | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 1 9  
Real Estate | Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Other | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 8 5  
Other | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 8 5  
Cash & Cash Equivalents | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 26 10  
Cash & Cash Equivalents | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 25 7  
Cash & Cash Equivalents | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 1 3  
Other assets and liabilities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ (1) $ 12