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COMMITMENTS, GUARANTEES AND CONTINGENCIES - Additional Information (Detail)
beneficiary in Millions, $ in Millions
12 Months Ended
Jan. 01, 2018
beneficiary
Dec. 31, 2018
USD ($)
State
Nov. 02, 2017
USD ($)
Loss Contingencies [Line Items]      
Purchase obligations in 2019   $ 240  
Purchase obligations in 2020   201  
Purchase obligations in 2021   136  
Purchase obligations in 2022   98  
Purchase obligations in 2023   $ 61  
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  
Total Medicare      
Loss Contingencies [Line Items]      
Percentage of premiums and services revenue   80.00%  
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%