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EMPLOYEE BENEFIT PLANS - Fair Values of Pension Plans (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
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    
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 591 $ 3,294 $ 2,953
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 179 1,055  
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 400 2,202  
Defined Benefit Plan Assets, Excluding Other Assets and Liabilities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 579 3,257  
Global Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 29 117  
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 29 52  
Global Equities | Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Global Equities | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 65  
Global Equity Funds at net asset value | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 208 733  
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 208 733  
Governments | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 26 1,270  
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 26 1,270  
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 0 0  
Corporate Bonds | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 103 162  
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 103 121  
Corporate Bonds | Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Corporate Bonds | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 41  
Fixed Income Securities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 189 923  
Fixed Income Securities | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 189 923  
Real Estate | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 9 13  
Real Estate | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 9 2  
Real Estate | Level 3 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 0  
Real Estate | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 11  
Other | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 5 (15)  
Other | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 5 (422)  
Other | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 0 407  
Cash & Cash Equivalents | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 10 54  
Cash & Cash Equivalents | Level 2 | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 7 32  
Cash & Cash Equivalents | Not Subject to Leveling | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount 3 22  
Other assets and liabilities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined benefit plan, plan assets, amount $ 12 $ 37