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Accounting Policies - Remaining Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-10-01
$ in Billions
Sep. 30, 2020
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligations, amount $ 20.5
Remaining performance obligation percentage expected to be recognized 25.00%
Performance obligation period 12 months