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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Narrative (Details)
beneficiary in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
USD ($)
beneficiary
State
Nov. 02, 2017
USD ($)
Loss Contingencies [Line Items]        
Purchase obligations in 2020     $ 922  
Purchase obligations in 2021     647  
Purchase obligations in 2022     489  
Purchase obligations in 2023     246  
Purchase obligations in 2024     $ 100  
Percentage of risk score calculated from claims submitted through EDS     25.00%  
Number of states comprising TRICARE beneficiaries | State     32  
Number of TRICARE beneficiaries | beneficiary     6  
Litigation recoveries sought       $ 611
Tricare East Region Contract        
Loss Contingencies [Line Items]        
Contract term years     5 years  
Medicare        
Loss Contingencies [Line Items]        
Percentage of premiums and services revenue     82.00%  
Military services        
Loss Contingencies [Line Items]        
Percentage of premiums and services revenue     1.00%  
Medicaid        
Loss Contingencies [Line Items]        
Percentage of premiums and services revenue     4.00%  
Forecast        
Loss Contingencies [Line Items]        
Percentage of risk score calculated from claims submitted through EDS 75.00% 50.00%