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Accounts Receivable, Net - Summary (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Allowance for doubtful accounts $ (68) $ (60) $ (69) $ (68) $ (69) $ (55)
Accounts receivable, net       781 883  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Balance 68 60 $ 69      
Provision for receivables 4 8        
Charge-offs (5) (2)        
Recoveries and other $ 0 $ (1)        
Credit Concentration Risk | Accounts Receivable            
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Concentration risk (percentage) 8.00%   7.20%      
Accounts Receivable            
Accounts, Notes, Loans and Financing Receivable [Line Items]            
Invoiced       637 735  
Accrued       212 217  
Allowance for doubtful accounts $ (68)   $ (69) (68) (69)  
Accounts receivable, net       $ 781 $ 883  
Accounts Receivable, Allowance for Credit Loss [Roll Forward]            
Balance $ 68   $ 69