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Summary of Significant Accounting Policies and Other Information (Details) (USD $)
Share data in Millions, except Per Share data, unless otherwise specified
 2 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Feb. 20, 2014
Dec. 30, 2012
Jul. 10, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Network equipment, site costs and related software [Member]
Minimum [Member]
Dec. 31, 2013
Network equipment, site costs and related software [Member]
Maximum [Member]
Dec. 31, 2013
Building and Building Improvements [Member]
Minimum [Member]
Dec. 31, 2013
Building and Building Improvements [Member]
Maximum [Member]
Dec. 31, 2013
Non-network Internal Use Software Office Equipment And Other [Member]
Minimum [Member]
Dec. 31, 2013
Non-network Internal Use Software Office Equipment And Other [Member]
Maximum [Member]
Dec. 31, 2013
Network and Non-network Software [Member]
Minimum [Member]
Dec. 31, 2013
Network and Non-network Software [Member]
Maximum [Member]
Dec. 31, 2013
U.S. Equity Securities [Member]
Dec. 31, 2013
U.S. Equity Securities [Member]
Dec. 31, 2013
International Equity Securities [Member] [Member]
Dec. 31, 2013
International Equity Securities [Member] [Member]
Dec. 31, 2013
Fixed Income Securities [Member]
Dec. 31, 2013
Fixed Income Securities [Member]
Dec. 31, 2013
Real Estate Investment [Member]
Dec. 31, 2013
Real Estate Investment [Member]
Dec. 31, 2013
Other Investment Companies [Member]
Dec. 31, 2013
Other Investment Companies [Member]
Jul. 10, 2013
Predecessor [Member]
Dec. 31, 2012
Predecessor [Member]
Dec. 31, 2011
Predecessor [Member]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Net Prior Service Cost (Credit) Arising During Period, Net of Tax                                                 $ (35,000,000) $ 339,000,000 $ 294,000,000
Allowance For Doubtful Accounts Writeoffs Net Of Recoveries     374,000,000 98,000,000 549,000,000 519,000,000                                          
Property, Plant and Equipment, Useful Life             3 years 30 years 3 years 30 years 3 years 12 years 3 years 5 years                          
Defined Benefit Plan, Fair Value of Plan Assets       1,800,000,000 1,600,000,000                                            
Defined Benefit Plan, Benefit Obligation       2,300,000,000 2,700,000,000                                            
Defined Benefit Plan, Funded Status of Plan       500,000,000 1,100,000,000                                            
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year       68,500,000                                              
Defined Benefit Plan, Actuarial Net (Gains) Losses   0                                             0 (404,000,000) (349,000,000)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate       5.30% 4.30%                                            
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets 7.75%     7.80%                                              
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities                             38.00% 41.00% 16.00% 18.00% 28.00% 21.00% 9.00% 10.00% 9.00% 10.00%      
Defined Benefit Plan Deviation from Target Allocation Percentage Plus or Minus       5.00%                                              
Percent of Fair Value of Plan Assets Valued at Level 1       49.00%                                              
Percent of Fair Value of Plan Assets at Level 2       33.00%                                              
Percent of Fair Value of Plan Assets Valued at Level 3       18.00%                                              
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Base Contribution       100.00%                                              
Defined Contribution Plan, Employer Matching Contribution, Percent, Base Contribution       3.00%                                              
Defined Contribution Plan, Employer Matching Contribution, Percent of Match, Additional Contribution       50.00%                                              
Defined Contribution Plan, Employer Matching Contribution, Percent, Additional Contribution       2.00%                                              
Defined Contribution Percentage Match of Participants Contributions Maximum         50.00% 50.00%                                          
Defined Contribution Maximum Percentage of Participant's Eligible Compensation         2.00% 2.00%                                          
Defined Contribution Plan Fixed Matching Contributions       35,000,000                                         32,000,000 30,000,000 31,000,000
Defined Contribution Percentage of Discretionary Match Of Participants Contributions Maximum                                                   3.95% 1.20%
Defined Contribution Plan Discretionary Contribution                                                   60,000,000 20,000,000
Defined contribution plan percentage of discretionary match                                                   100.00%  
Percentage of Operating Revenues Related to Universal Service Fund Fees       2.00% 2.00% 2.00%                                          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures       1.7                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 3.63                                              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Maximum       2.01%                                              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Maximum       42.30%                                              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate       0.00%                                              
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term       7 years 6 months                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number       48                                              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number       34                                              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 6.23                                              
Pre Tax Share And Non Share Based Compensation Charges       98,000,000                                         37,000,000 82,000,000 73,000,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense       34,000,000                                         2,000,000 14,000,000 13,000,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized       126,000,000                                              
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition       2 years 1 month 20 days                                              
Advertising Expense       $ 697,000,000                                         $ 858,000,000 $ 1,400,000,000 $ 1,400,000,000