Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Performance Obligation (Details)

v3.21.2
Summary of Significant Accounting Policies - Performance Obligation (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Accounting Policies [Abstract]    
Remaining performance obligation $ 4,370 $ 3,990
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Percent of remaining performance obligation expected to be recognized   71.20%
Recognition period for remaining performance obligation   12 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-10-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Percent of remaining performance obligation expected to be recognized 78.70%  
Recognition period for remaining performance obligation 12 months