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Revenue Recognition (Disaggregation Of Revenue) (Details) - USD ($)
$ in Millions
1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Apr. 30, 2021
Jun. 30, 2021
Jun. 30, 2022
Apr. 30, 2021
Jun. 30, 2022
Successor [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers   $ 1,006 $ 1,442   $ 2,884
Subsidy and other revenue   55 17   22
Total revenue   1,061 1,459   2,906
Successor [Member] | Data And Internet Services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers   556 847   1,683
Successor [Member] | Voice Services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers   283 381   767
Successor [Member] | Video Services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers   105 134   271
Successor [Member] | Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers   62 80   163
Successor [Member] | Consumer [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers   543 791   1,567
Successor [Member] | Business And Wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers   $ 463 $ 651   $ 1,317
Predecessor [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers $ 527     $ 2,120  
Subsidy and other revenue 28     111  
Total revenue 555     2,231  
Predecessor [Member] | Data And Internet Services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 283     1,125  
Predecessor [Member] | Voice Services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 160     647  
Predecessor [Member] | Video Services [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 54     223  
Predecessor [Member] | Other [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 30     125  
Predecessor [Member] | Consumer [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 283     1,133  
Predecessor [Member] | Business And Wholesale [Member]          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers $ 244     $ 987