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GOODWILL AND OTHER INTANGIBLE ASSETS - Details of Intangible Assets Included in Other Long-Term Assets (Detail) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 8 years 8 months  
Cost $ 832 $ 770
Accumulated Amortization 548 544
Net $ 284 226
Customer contracts/ relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 8 years 8 months  
Cost $ 646 566
Accumulated Amortization 404 401
Net $ 242 165
Trade names and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 6 years 5 months  
Cost $ 84 104
Accumulated Amortization 80 84
Net $ 4 20
Provider contracts    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 11 years 11 months  
Cost $ 68 68
Accumulated Amortization 34 30
Net $ 34 38
Noncompetes and other    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 8 years 1 month  
Cost $ 34 32
Accumulated Amortization 30 29
Net $ 4 $ 3