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Revenue Recognition Accounting Policy (Details 4) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue $ 395 $ 392
1 year [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 56  
2 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 53  
3 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 49  
4 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 45  
5 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized 40  
Thereafter 5 years [Member]    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Deferred Revenue, Revenue Recognized $ 152