Repurchase of CenturyLink Common Stock (Details) - Share repurchase program authorized February 2014 - USD ($) $ / shares in Units, shares in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Feb. 27, 2014	Jun. 30, 2015	Feb. 28, 2014
Schedule of Stock Repurchases
Stock repurchase program, period in force	24 months
Stock repurchases, aggregate authorized amount			$ 1,000
Number of shares repurchased and retired (shares)		7
Aggregate market price of shares repurchased		$ 260
Average purchase price at which shares were repurchased (in dollars per share)		$ 36.83
Stock repurchases, remaining authorized amount		$ 540