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Long-Term Debt and Credit Facilities (Details 2)
$ in Millions
1 Months Ended 12 Months Ended
Jan. 31, 2016
USD ($)
Sep. 21, 2015
USD ($)
Mar. 19, 2015
USD ($)
Feb. 20, 2015
USD ($)
Dec. 03, 2014
USD ($)
lender
Sep. 29, 2014
USD ($)
Jan. 31, 2015
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Oct. 13, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 15, 2015
USD ($)
Feb. 15, 2015
USD ($)
Oct. 01, 2014
USD ($)
Apr. 01, 2014
USD ($)
Apr. 30, 2011
USD ($)
Long-term Debt and Credit Facilities                                  
Total long-term debt [1]               $ 20,529.0                  
Interest expense:                                  
Gross interest expense               1,364.0 $ 1,358.0 $ 1,339.0              
Capitalized interest               (52.0) (47.0) (41.0)              
Total interest expense               1,312.0 1,311.0 1,298.0              
Repayments of long-term debt               $ 966.0 800.0 $ 2,010.0              
Qwest Corporation | Revolving credit facility                                  
Interest expense:                                  
Debt to EBITDA ratio to be maintained under the Credit Facility               2.85                  
CenturyLink, Inc. | Revolving credit facility                                  
Interest expense:                                  
Debt to EBITDA ratio to be maintained under the Credit Facility               4.0                  
Senior notes | Qwest Corporation                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               $ 7,229.0 7,311.0                
Senior notes | Qwest Corporation | Minimum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               6.125%                  
Senior notes | Qwest Corporation | Maximum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               8.375%                  
Senior notes | Qwest Corporation | 6.625% Notes due 2055                                  
Long-term Debt and Credit Facilities                                  
Aggregate principal amount of debt issuance   $ 400.0                   $ 10.0          
Interest rate, stated percentage (as a percent)   6.625%                              
Net proceeds from issuance of debt   $ 386.0                              
Senior notes | Qwest Corporation | 6.875% Notes due 2054                                  
Long-term Debt and Credit Facilities                                  
Aggregate principal amount of debt issuance           $ 500.0                      
Interest rate, stated percentage (as a percent)           6.875%                      
Net proceeds from issuance of debt           $ 483.0                      
Senior notes | Qwest Corporation | 7.200% Note due 2026                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)                     7.20%            
Repurchased face amount of Senior notes                     $ 250.0            
Senior notes | Qwest Corporation | 6.875% Noted due 2033                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)                     6.875%            
Repurchased face amount of Senior notes                     $ 150.0            
Senior notes | Qwest Corporation | 7.625 % Notes Due 2015                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)                         7.625%        
Repurchased face amount of Senior notes                         $ 92.0        
Senior notes | Qwest Corporation | 7.500% Notes due 2014                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)                             7.50%    
Repurchased face amount of Senior notes                             $ 600.0    
Senior notes | CenturyLink, Inc.                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               $ 7,975.0 7,825.0                
Senior notes | CenturyLink, Inc. | Minimum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               5.15%                  
Senior notes | CenturyLink, Inc. | Maximum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               7.65%                  
Senior notes | CenturyLink, Inc. | 5.625% Notes due 2025                                  
Long-term Debt and Credit Facilities                                  
Aggregate principal amount of debt issuance     $ 500.0                            
Interest rate, stated percentage (as a percent)     5.625%                            
Net proceeds from issuance of debt     $ 494.0                            
Senior notes | CenturyLink, Inc. | Series M 5.00% Notes                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)                           5.00%      
Repurchased face amount of Senior notes                           $ 350.0      
Senior notes | Embarq Corporation                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               $ 2,669.0 2,669.0                
Interest expense:                                  
Percentage of net tangible assets allowed to secure senior notes (percent)               15.00%                  
Senior notes | Embarq Corporation | Minimum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               7.082%                  
Senior notes | Embarq Corporation | Maximum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               7.995%                  
Medium-term notes | Qwest Corporation                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               $ 100.0 0.0                
Medium-term notes | Qwest Corporation | Term loan                                  
Long-term Debt and Credit Facilities                                  
Aggregate principal amount of debt issuance       $ 100.0                          
Total long-term debt               100.0                  
Medium-term notes | Qwest Corporation | Term loan | Minimum | Base Rate                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)       0.50%                          
Medium-term notes | Qwest Corporation | Term loan | Minimum | London Interbank Offered Rate (LIBOR)                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)       1.50%                          
Medium-term notes | Qwest Corporation | Term loan | Maximum | Base Rate                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)       1.50%                          
Medium-term notes | Qwest Corporation | Term loan | Maximum | London Interbank Offered Rate (LIBOR)                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)       2.50%                          
Medium-term notes | CenturyLink, Inc.                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               358.0 380.0                
Line of credit | CenturyLink, Inc.                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               410.0 725.0                
Line of credit | CenturyLink, Inc. | Credit Facility | Revolving credit facility                                  
Long-term Debt and Credit Facilities                                  
Number of subsidiary Guarantors for Credit Facility         9                        
Maximum borrowing capacity         $ 2,000.0                        
Number of lenders of Credit Facility | lender         16                        
Line of credit | CenturyLink, Inc. | Credit Facility | Revolving credit facility | Minimum                                  
Long-term Debt and Credit Facilities                                  
Lender commitment         $ 3.5                        
Line of credit | CenturyLink, Inc. | Credit Facility | Revolving credit facility | Minimum | Base Rate                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)         0.00%                        
Line of credit | CenturyLink, Inc. | Credit Facility | Revolving credit facility | Minimum | London Interbank Offered Rate (LIBOR)                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)         1.00%                        
Line of credit | CenturyLink, Inc. | Credit Facility | Revolving credit facility | Maximum                                  
Long-term Debt and Credit Facilities                                  
Lender commitment         $ 198.5                        
Line of credit | CenturyLink, Inc. | Credit Facility | Revolving credit facility | Maximum | Base Rate                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)         1.25%                        
Line of credit | CenturyLink, Inc. | Credit Facility | Revolving credit facility | Maximum | London Interbank Offered Rate (LIBOR)                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)         2.25%                        
Line of credit | CenturyLink, Inc. | Credit Facility | Letter of credit                                  
Long-term Debt and Credit Facilities                                  
Maximum borrowing capacity         $ 400.0                        
Line of credit | CenturyLink, Inc. | Uncommitted revolving line of credit | Line of credit                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               80.0                  
Maximum borrowing capacity             $ 100.0                    
Number of lenders of revolving line of credit             1                    
Line of credit | CenturyLink, Inc. | Uncommitted revolving line of credit | Line of credit | Minimum | London Interbank Offered Rate (LIBOR)                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)             1.00%                    
Line of credit | CenturyLink, Inc. | Uncommitted revolving line of credit | Line of credit | Maximum | London Interbank Offered Rate (LIBOR)                                  
Long-term Debt and Credit Facilities                                  
Interest rate margin (as a percent)             2.25%                    
First mortgage bonds | Embarq Corporation                                  
Long-term Debt and Credit Facilities                                  
Total long-term debt               $ 232.0 232.0                
Interest expense:                                  
Percentage of subsidiary property, plant and equipment securing debt, (percent)               10.00%                  
First mortgage bonds | Embarq Corporation | Minimum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               7.125%                  
First mortgage bonds | Embarq Corporation | Maximum                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               8.77%                  
First mortgage bonds | Embarq Corporation | 7.460% Notes Due 2014                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)                               7.46%  
Repurchased face amount of Senior notes                               $ 30.0  
Other | Embarq Corporation                                  
Long-term Debt and Credit Facilities                                  
Interest rate, stated percentage (as a percent)               9.00%                  
Total long-term debt               $ 150.0 150.0                
Letter of credit | CenturyLink, Inc. | Uncommitted revolving letter of credit facility | Letter of credit                                  
Long-term Debt and Credit Facilities                                  
Maximum borrowing capacity                                 $ 160.0
Letters of credit outstanding               $ 109.0 $ 124.0                
Subsequent Event | Senior notes | Qwest Corporation | 7.00% Notes due 2056                                  
Long-term Debt and Credit Facilities                                  
Aggregate principal amount of debt issuance $ 235.0                                
Interest rate, stated percentage (as a percent) 7.00%                                
Net proceeds from issuance of debt $ 227.0                                
[1] Actual principal paid in all years may differ due to the possible future refinancing of outstanding debt or the issuance of new debt.