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Revenues from Contracts with Customers - Narrative (Details)
$ in Millions
3 Months Ended
Jun. 30, 2018
USD ($)
segments
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Disaggregation of Revenue [Line Items]      
Number of Reportable Segments | segments 2    
Remaining performance obligation $ 9,643    
Total revenue 8,125    
Equipment sales      
Disaggregation of Revenue [Line Items]      
Total revenue $ 1,173    
Minimum [Member] | Leasing Contracts [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 18 months    
Minimum [Member] | Handsets [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 24 months    
Minimum [Member] | Accessories [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 12 months    
Minimum [Member] | Wireline [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 24 months    
Maximum [Member] | Wireless Service [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 24 months    
Maximum [Member] | Leasing Contracts [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 30 months    
Maximum [Member] | Handsets [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 30 months    
Maximum [Member] | Accessories [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 18 months    
Maximum [Member] | Wireline [Member]      
Disaggregation of Revenue [Line Items]      
Performance period 36 months    
Scenario, Forecast [Member]      
Disaggregation of Revenue [Line Items]      
Remaining performance obligation   $ 872 $ 2,700
Sales Channel, Through Intermediary [Member] | Equipment sales      
Disaggregation of Revenue [Line Items]      
Total revenue $ 750