Segment Information - Narrative, Future Performance Obligations (Details) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01 $ in Billions	Sep. 30, 2021 USD ($)
Segment Reporting Information [Line Items]
Revenue, remaining performance obligation, amount	$ 4.5
Minimum
Segment Reporting Information [Line Items]
Future performance obligation, expected timing of satisfaction, period	1 year
Maximum
Segment Reporting Information [Line Items]
Future performance obligation, expected timing of satisfaction, period	3 years