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Revenue Recognition - Remaining Performance Obligation (Details)
$ in Billions
Dec. 31, 2020
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, remaining performance obligation $ 8.4
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, requirement of payment, terms 24 months