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EMPLOYEE BENEFIT PLANS - Fair Value and Level 3 (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 2,110 $ 2,808  
NAV      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 600 594  
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2,110 2,808 $ 2,744
Qualified Plan | Public corporate      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 619 842  
Qualified Plan | Public corporate | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | Public corporate | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 619 842  
Qualified Plan | U.S. government, agencies and authorities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 336 426  
Qualified Plan | U.S. government, agencies and authorities | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | U.S. government, agencies and authorities | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 336 426  
Qualified Plan | States and political subdivisions      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 8 16  
Qualified Plan | States and political subdivisions | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | States and political subdivisions | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 8 16  
Qualified Plan | Foreign governments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 15 18  
Qualified Plan | Foreign governments | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | Foreign governments | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 15 18  
Qualified Plan | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 2,117 2,805  
Qualified Plan | Pension Benefits | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 385 657  
Qualified Plan | Pension Benefits | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,132 1,555  
Qualified Plan | Pension Benefits | Level 3 | Private Real Estate Investment Trusts      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation      
Beginning Balance 0 0 0
Actual return on plan assets — Sales/Settlements 0 0 0
Ending Balance 0 0 0
Qualified Plan | Pension Benefits | Level 3 | Other Equity Investments      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation      
Beginning Balance 0 0 0
Actual return on plan assets — Sales/Settlements 0 0 0
Ending Balance 0 0 0
Qualified Plan | Pension Benefits | Level 3 | Fixed maturities      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation      
Beginning Balance (1) 0 1
Actual return on plan assets — Sales/Settlements (1) (1) (1)
Ending Balance (2) (1) $ 0
Qualified Plan | Pension Benefits | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 1,517 2,212  
Qualified Plan | Pension Benefits | NAV      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 600 593  
Qualified Plan | Pension Benefits | Common equity, REITs and preferred equity      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 367 684  
Qualified Plan | Pension Benefits | Common equity, REITs and preferred equity | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 308 576  
Qualified Plan | Pension Benefits | Common equity, REITs and preferred equity | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 59 108  
Qualified Plan | Pension Benefits | Mutual funds      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 30 62  
Qualified Plan | Pension Benefits | Mutual funds | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 30 62  
Qualified Plan | Pension Benefits | Mutual funds | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | Pension Benefits | Collective Trust      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 61 99  
Qualified Plan | Pension Benefits | Collective Trust | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | Pension Benefits | Collective Trust | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 61 99  
Qualified Plan | Pension Benefits | Cash and cash equivalents      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 47 19  
Qualified Plan | Pension Benefits | Cash and cash equivalents | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 47 19  
Qualified Plan | Pension Benefits | Cash and cash equivalents | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | Pension Benefits | Short-term investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 34 46  
Qualified Plan | Pension Benefits | Short-term investments | Level 1      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 0  
Qualified Plan | Pension Benefits | Short-term investments | Level 2      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 34 $ 46