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Revenue (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Advanced billings, revenue recognized $ 106  
Advanced billings from lease $ 6 $ 8
Expected timing of satisfaction period 12 months  
Support services | Minimum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Period of recognition 1 year  
Support services | Maximum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Period of recognition 5 years  
Business services | Minimum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Period of recognition 1 year  
Business services | Maximum    
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]    
Period of recognition 5 years