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Revenue from Contracts With Customers - Performance obligations (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Sales expected to be recognized on multi-year contracts in place as of the end of the period $ 2,688
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Period in which remaining performance obligations expect to be satisfied and revenue recognized 12 months
Sales expected to be recognized on multi-year contracts in place as of the end of the period $ 1,398
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Period in which remaining performance obligations expect to be satisfied and revenue recognized
Sales expected to be recognized on multi-year contracts in place as of the end of the period $ 1,290