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LEASES (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Lessee Disclosure [Abstract]          
Operating Lease, Right-of-Use Asset $ 159   $ 159   $ 185
Operating Lease, Right-of-Use Asset, Reclassified 9   9   9
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 31   31    
Lessee, Operating Lease, Liability, Payments, Due Year Two 48   48    
Lessee, Operating Lease, Liability, Payments, Due Year Three 34   34    
Lessee, Operating Lease, Liability, Payments, Due Year Four 20   20    
Lessee, Operating Lease, Liability, Payments, Due Year Five 13   13    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 31   31    
Lessee, Operating Lease, Liability, Payments, Due 177   177    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 16   16    
Operating Lease, Liability 161   161    
Operating Lease, Liability, Current 53   53    
Operating Lease, Liability, Noncurrent 108   108    
Lease, Cost [Abstract]          
Operating Lease, Cost 18 $ 18 36 $ 37  
Short-term Lease, Cost 11 10 19 19  
Sublease Income (1) (1) (2) (2)  
Lease, Cost 28 27 53 54  
Operating Lease, Payments 18 18 35 36  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 26 $ 14 $ 34 $ 30  
Operating Lease, Weighted Average Remaining Lease Term 5 years 5 years 5 years 5 years  
Operating Lease, Weighted Average Discount Rate, Percent 3.50% 3.90% 3.50% 3.90%  
Other Prepaid Expense, Current $ 8   $ 8   $ 9