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Revenue Recognition Accounting Policy (Details 3) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue $ 407 $ 415
1 year [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 64  
2 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 59  
3 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 54  
4 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 49  
5 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 43  
Thereafter 5 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized $ 138