Summary of Significant Accounting Policies - Performance Obligation (Details) $ in Millions |
Sep. 30, 2019
USD ($)
|
---|---|
Accounting Policies [Abstract] | |
Remaining performance obligation | $ 4,400 |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-10-01 | |
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] | |
Percent of remaining performance obligation expected to be recognized | 65.50% |
Recognition period for remaining performance obligation | 12 months |