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GOODWILL AND OTHER INTANGIBLE ASSETS - Intangible Assets Included in Other Long-Term Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 8 years 8 months  
Cost $ 829 $ 827
Accumulated Amortization 601 582
Net $ 228 245
Customer contracts/ relationships    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 8 years 8 months  
Cost $ 646 646
Accumulated Amortization 450 434
Net $ 196 212
Trade names and technology    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 6 years 5 months  
Cost $ 84 84
Accumulated Amortization 84 83
Net $ 0 1
Provider contracts    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 11 years 8 months  
Cost $ 70 68
Accumulated Amortization 39 37
Net $ 31 31
Noncompetes and other    
Acquired Finite-Lived Intangible Assets [Line Items]    
Weighted Average Life 7 years 3 months  
Cost $ 29 29
Accumulated Amortization 28 28
Net $ 1 $ 1