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COMMITMENTS AND CONTINGENCIES - Commitments (Details)
£ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Mar. 15, 2019
lawsuit
Dec. 31, 2019
USD ($)
lawsuit
province
Dec. 31, 2018
USD ($)
Jul. 09, 2019
GBP (£)
Commitments and Contingencies Disclosure [Line Items]        
Letters of credit outstanding   $ 145    
Surety bonds issued   160    
Proceeds from insurance recoveries   58    
Information Technology Hardware, Software, Accounting, Finance, and Maintenance Services        
Commitments and Contingencies Disclosure [Line Items]        
Purchase obligation   276    
Purchase obligation, expected to fund commitments in 2020   116    
Purchase obligation, expected to fund commitments in 2021   97    
Purchase obligation, expected to fund commitments in 2022   63    
Data Security Incident        
Commitments and Contingencies Disclosure [Line Items]        
Expense related to data security incident   148 $ 28  
Insurance recoveries   84 $ 25  
Data Security Incident, UK Information Commissioner's Office        
Commitments and Contingencies Disclosure [Line Items]        
Estimated fine   $ 65   £ 99
Putative Class Action Lawsuits Related to Data Security Incident        
Commitments and Contingencies Disclosure [Line Items]        
Number of lawsuits filed | lawsuit   100    
Shareholder Derivative Complaints Related to Data Security Incident        
Commitments and Contingencies Disclosure [Line Items]        
Number of new lawsuits filed | lawsuit 2      
Canadian Putative Class Action Lawsuits Related to Data Security Incident        
Commitments and Contingencies Disclosure [Line Items]        
Number of lawsuits filed | lawsuit   5    
Number of provinces where cases are pending | province   5