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Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Financial Instruments    
Cash and cash equivalents $ 853 $ 921
Short-term investments $ 0 17
7.0% Senior Notes    
Financial Instruments    
Interest rate 7.00%  
6.875% Senior Notes    
Financial Instruments    
Interest rate 6.875%  
6.625% Senior Notes    
Financial Instruments    
Interest rate 6.625%  
5.875% Senior Notes    
Financial Instruments    
Interest rate 5.875%  
6.95% Senior Notes | U.S. Cellular    
Financial Instruments    
Interest rate 6.95%  
7.25% 2063 Senior Notes | U.S. Cellular    
Financial Instruments    
Interest rate 7.25%  
7.25% 2064 Senior Notes | U.S. Cellular    
Financial Instruments    
Interest rate 7.25%  
6.7% Senior Notes | U.S. Cellular    
Financial Instruments    
Interest rate 6.70%  
Book Value    
Financial Instruments    
Cash and cash equivalents $ 853 921
Short-term investments 0 17
Book Value | Retail    
Financial Instruments    
Long-term debt 1,753 1,753
Book Value | Institutional    
Financial Instruments    
Long-term debt 534 534
Book Value | Other    
Financial Instruments    
Long-term debt 173 182
Fair Value | Level 1    
Financial Instruments    
Cash and cash equivalents 853 921
Short-term investments 0 17
Fair Value | Level 2 | Retail    
Financial Instruments    
Long-term debt 1,796 1,596
Fair Value | Level 2 | Institutional    
Financial Instruments    
Long-term debt 583 531
Fair Value | Level 2 | Other    
Financial Instruments    
Long-term debt $ 173 $ 182
Interest rate | Institutional and Other | Minimum    
Financial Instruments    
Fair value assumption, interest rate 3.80% 5.03%
Interest rate | Institutional and Other | Maximum    
Financial Instruments    
Fair value assumption, interest rate 6.75% 8.00%