Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Concentrations (Details)

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Summary of Significant Accounting Policies - Concentrations (Details) - USF Program - Revenue - Customer concentration - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Concentration Risk [Line Items]      
Customer concentration (as a percent) 32.00% 29.00% 24.00%
Receivables net, current $ 148