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Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Financial Instruments    
Cash and cash equivalents $ 1,429 $ 465
Short-term investments 3 0
Book Value    
Financial Instruments    
Cash and cash equivalents 1,429 465
Short-term investments 3 0
Book Value | Retail    
Financial Instruments    
Long-term debt 2,753 1,753
Book Value | Institutional    
Financial Instruments    
Long-term debt 535 534
Book Value | Other    
Financial Instruments    
Long-term debt 230 84
Fair Value | Level 1    
Financial Instruments    
Cash and cash equivalents 1,429 465
Short-term investments 3 0
Fair Value | Level 2 | Retail    
Financial Instruments    
Long-term debt 2,809 1,796
Fair Value | Level 2 | Institutional    
Financial Instruments    
Long-term debt 707 594
Fair Value | Level 2 | Other    
Financial Instruments    
Long-term debt $ 230 $ 84
7.0% Senior Notes    
Financial Instruments    
Interest rate on debt 7.00%  
6.875% Senior Notes    
Financial Instruments    
Interest rate on debt 6.875%  
6.625% Senior Notes    
Financial Instruments    
Interest rate on debt 6.625%  
5.875% Senior Notes    
Financial Instruments    
Interest rate on debt 5.875%  
7.25% 2063 Senior Notes | UScellular    
Financial Instruments    
Interest rate on debt 7.25%  
7.25% 2064 Senior Notes | UScellular    
Financial Instruments    
Interest rate on debt 7.25%  
6.95% Senior Notes | UScellular    
Financial Instruments    
Interest rate on debt 6.95%  
6.7% Senior Notes | UScellular    
Financial Instruments    
Interest rate on debt 6.70%  
6.25% Senior Notes | UScellular    
Financial Instruments    
Interest rate on debt 6.25%  
5.5% Senior Notes | UScellular    
Financial Instruments    
Interest rate on debt 5.50%  
Interest rate | Institutional and Other | Minimum    
Financial Instruments    
Fair value assumption, interest rate 1.35% 3.55%
Interest rate | Institutional and Other | Maximum    
Financial Instruments    
Fair value assumption, interest rate 3.75% 6.25%