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Severance, Exit Costs and Asset Impairments Severance, Exit Costs and Asset Impairments (Schedule of Severance and Exit Costs Liability) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 9 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 3 Months Ended 3 Months Ended 0 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended 6 Months Ended 0 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2013
Jul. 10, 2013
Sep. 30, 2013
Jul. 10, 2013
Wireless [Member]
Jul. 10, 2013
Wireless [Member]
Lease [Member]
Sep. 30, 2013
Successor [Member]
Sep. 30, 2013
Successor [Member]
Jul. 11, 2013
Successor [Member]
Jul. 10, 2013
Successor [Member]
Sep. 30, 2013
Successor [Member]
Lease [Member]
Jul. 11, 2013
Successor [Member]
Lease [Member]
Jul. 10, 2013
Successor [Member]
Lease [Member]
Sep. 30, 2013
Successor [Member]
Access [Member]
Jul. 11, 2013
Successor [Member]
Access [Member]
Jul. 10, 2013
Successor [Member]
Access [Member]
Sep. 30, 2013
Successor [Member]
Wireless [Member]
Sep. 30, 2013
Successor [Member]
Wireless [Member]
Lease [Member]
Sep. 30, 2013
Successor [Member]
Wireline [Member]
Sep. 30, 2013
Successor [Member]
Wireline [Member]
Lease [Member]
Jul. 10, 2013
Predecessor [Member]
Jul. 10, 2013
Predecessor [Member]
Sep. 30, 2012
Predecessor [Member]
Dec. 31, 2012
Predecessor [Member]
Jul. 10, 2013
Predecessor [Member]
Lease [Member]
Dec. 31, 2012
Predecessor [Member]
Lease [Member]
Jul. 10, 2013
Predecessor [Member]
Employee Severance [Member]
Jul. 10, 2013
Predecessor [Member]
Access [Member]
Jul. 10, 2013
Predecessor [Member]
Access [Member]
Dec. 31, 2012
Predecessor [Member]
Access [Member]
Jul. 10, 2013
Predecessor [Member]
Wireless [Member]
Jul. 10, 2013
Predecessor [Member]
Wireless [Member]
Lease [Member]
Jul. 10, 2013
Predecessor [Member]
Wireless [Member]
Access [Member]
Jul. 10, 2013
Predecessor [Member]
Wireline [Member]
Sep. 30, 2013
Cost of products and services [Member]
Wireline [Member]
Access [Member]
Jul. 10, 2013
Cost of products and services [Member]
Predecessor [Member]
Access [Member]
Sep. 30, 2013
Restructuring Charges [Member]
Wireless [Member]
Access [Member]
Jul. 10, 2013
Restructuring Charges [Member]
Predecessor [Member]
Access [Member]
Restructuring Reserve [Roll Forward]                                                                          
Restructuring Reserve           $ 1,102 $ 1,102 $ 1,015 $ 1,009 $ 863 $ 772 $ 766 $ 161 $ 189 $ 189               $ 244   $ 190       $ 43                
Supplemental Unemployment Benefits, Severance Benefits           78 78 54 54                           11                            
Restructuring Reserve, Translation and Other Adjustment                                         131     131   0   0                  
Restructuring Charges 103 (652) (103)   (37) 110       45     24       43   2   687           18 151     478 133   7 35 17 116
Restructuring Reserve, Settled with Cash           (23)                             53                                
Severance Costs       (32)   41                   33   8     58                 55     3        
Restructuring reserved settled with cash and other adjustments           52       (46)                           (33)       (5)                  
Payments for Postemployment Benefits           17                             (15)                                
Asset impairments     $ 0     $ 0 $ 0                         $ 0 $ 0 $ 84