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LEASES - Additional Information (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Leases [Abstract]    
Short-term lease expenses $ 4 $ 8
Operating lease expenses 40 79
Operating lease right-of-use assets 434 434
Operating lease liabilities $ 432 432
Leased assets obtained in exchange for operating lease obligations   41
Operating cash outflow for amounts included in the measurement of operating lease obligations   $ 79
Weighted average remaining lease term 6 years 10 months 24 days 6 years 10 months 24 days
Weighted average discount rate 3.60% 3.60%
Minimum    
Lessee, Lease, Description [Line Items]    
Operating lease term 3 years 3 years
Maximum    
Lessee, Lease, Description [Line Items]    
Operating lease term 5 years 5 years