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Remaining Unsatisfied Performance Obligations - Schedule of remaining performance obligation (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 20,541
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 11,039
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, period (in years) 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 5,610
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, period (in years) 1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-10-01  
Revenue from Contract with Customer [Abstract]  
Remaining performance obligation $ 3,892
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Remaining performance obligation, period (in years)