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Stockholder's Equity (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Stockholder's Equity (Deficit)        
Common stock, shares issued (in shares)   1 1  
Common stock, shares outstanding (shares)   1 1  
Dividend of equity interest in limited liability company to Qwest Services Corporation $ 12      
Dividends        
Dividends declared to QSC   $ 1,000 $ 1,300 $ 1,350
Cash dividend paid to QSC   $ 1,000 $ 1,300 $ 1,350
COMMON STOCK        
Stockholder's Equity (Deficit)        
Common stock, shares issued (in shares)   1    
Common stock, shares outstanding (shares)   1