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Marketable Investment Securities, Restricted Cash and Cash Equivalents, and Other Investment Securities - Investments Measured at Fair Value On A Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Jul. 01, 2020
Fair value of marketable securities      
Debt securities $ 540,000,000    
Fair value of derivative 721,000 $ 678,000  
Fair value measurements on recurring basis      
Fair value of marketable securities      
Cash Equivalents (including restricted) 2,672,633 7,592,696  
Total 541,275 3,004,214  
Fair value measurements on recurring basis | Commercial paper      
Fair value of marketable securities      
Total 358,994 2,533,875  
Fair value measurements on recurring basis | Corporate securities      
Fair value of marketable securities      
Total 180,246 462,999  
Fair value measurements on recurring basis | Other (including restricted)      
Fair value of marketable securities      
Total 580 5,445  
Fair value measurements on recurring basis | Equity securities      
Fair value of marketable securities      
Equity securities 1,455 1,895  
Fair value measurements on recurring basis | Level 1      
Fair value of marketable securities      
Cash Equivalents (including restricted) 230,850 83,302  
Total 1,455 1,895  
Fair value measurements on recurring basis | Level 1 | Equity securities      
Fair value of marketable securities      
Equity securities 1,455 1,895  
Fair value measurements on recurring basis | Level 2      
Fair value of marketable securities      
Cash Equivalents (including restricted) 2,441,783 7,509,394  
Total 539,676 3,002,167  
Fair value measurements on recurring basis | Level 2 | Commercial paper      
Fair value of marketable securities      
Total 358,994 2,533,875  
Fair value measurements on recurring basis | Level 2 | Corporate securities      
Fair value of marketable securities      
Total 180,246 462,999  
Fair value measurements on recurring basis | Level 2 | Other (including restricted)      
Fair value of marketable securities      
Total 436 5,293  
Fair value measurements on recurring basis | Level 3      
Fair value of marketable securities      
Total 144 152  
Fair value measurements on recurring basis | Level 3 | Other (including restricted)      
Fair value of marketable securities      
Total $ 144 $ 152  
Boost Mobile Acquisition      
Fair value of marketable securities      
Spectrum purchase option fair value     $ 713,000