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Revenue - Remaining Performance Obligation (Details)
$ in Millions
Sep. 30, 2021
USD ($)
Revenue from Contract with Customer [Abstract]  
Contract liabilities $ 195
Performance obligation, amount 184
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, amount 184
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01  
Revenue from Contract with Customer [Abstract]  
Performance obligation, amount 46
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, amount $ 46
Performance period 12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-10-01  
Revenue from Contract with Customer [Abstract]  
Performance obligation, amount $ 138
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]  
Performance obligation, amount $ 138
Performance period