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LEASES (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Lessee Disclosure [Abstract]          
Operating Lease, Right-of-Use Asset $ 184   $ 184   $ 185
Operating Lease, Right-of-Use Asset, Reclassified 8   8   9
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 16   16    
Lessee, Operating Lease, Liability, Payments, Due Year Two 54   54    
Lessee, Operating Lease, Liability, Payments, Due Year Three 40   40    
Lessee, Operating Lease, Liability, Payments, Due Year Four 25   25    
Lessee, Operating Lease, Liability, Payments, Due Year Five 18   18    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 46   46    
Lessee, Operating Lease, Liability, Payments, Due 199   199    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 17   17    
Operating Lease, Liability 182   182    
Operating Lease, Liability, Current 54   54    
Operating Lease, Liability, Noncurrent 128   128    
Lease, Cost [Abstract]          
Operating Lease, Cost 18 $ 18 54 $ 55  
Short-term Lease, Cost 9 9 28 28  
Sublease Income (1) (1) (3) (3)  
Lease, Cost 26 26 79 80  
Operating Lease, Payments 17 17 52 53  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 59 $ 10 $ 93 $ 40  
Operating Lease, Weighted Average Remaining Lease Term 6 years 5 years 6 years 5 years  
Operating Lease, Weighted Average Discount Rate, Percent 3.10% 3.80% 3.10% 3.80%  
Other Prepaid Expense, Current $ 8   $ 8   $ 9