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Revenue from Contracts with Customers - Remaining Performance Obligations. (Details)
$ in Billions
Sep. 30, 2023
USD ($)
Revenue from Contract with Customer [Abstract]  
Revenue, Remaining Performance Obligation, Amount $ 1.8
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01  
Revenue from Contract with Customer [Abstract]  
Revenue, Remaining Performance Obligation, Percentage 63.50%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 12 months
Revenue, Remaining Performance Obligation, Percentage 63.50%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-10-01  
Revenue from Contract with Customer [Abstract]  
Revenue, Remaining Performance Obligation, Percentage 23.50%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period 12 months
Revenue, Remaining Performance Obligation, Percentage 23.50%