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LEASES (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Lessee Disclosure [Abstract]      
Operating Lease, Right-of-Use Asset $ 177   $ 185
Operating Lease, Right-of-Use Asset, Reclassified 9   9
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 46    
Lessee, Operating Lease, Liability, Payments, Due Year Two 47    
Lessee, Operating Lease, Liability, Payments, Due Year Three 33    
Lessee, Operating Lease, Liability, Payments, Due Year Four 19    
Lessee, Operating Lease, Liability, Payments, Due Year Five 12    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 28    
Lessee, Operating Lease, Liability, Payments, Due 185    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 16    
Operating Lease, Liability 169    
Operating Lease, Liability, Current 55    
Operating Lease, Liability, Noncurrent 114    
Lease, Cost [Abstract]      
Operating Lease, Cost 18 $ 19  
Short-term Lease, Cost 8 9  
Sublease Income (1) (1)  
Lease, Cost 25 27  
Operating Lease, Payments 17 18  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 8 $ 16  
Operating Lease, Weighted Average Remaining Lease Term 5 years 5 years  
Operating Lease, Weighted Average Discount Rate, Percent 3.50% 3.90%  
Other Prepaid Expense, Current $ 8   $ 9