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Goodwill, Spectrum License Transactions and Other Intangible Assets - Narrative (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill   $ 1,930 $ 1,901
PushSpring      
Goodwill [Line Items]      
Cash consideration $ 32    
Goodwill $ 29