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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]      
Total operating revenue $ 6,449 $ 6,951 $ 7,313
Adjustments for Non-ASC 606 Revenue (373) (483) (479)
Total Revenue from Contracts with Customers 6,076 6,468 6,834
Goods and services transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total Revenue from Contracts with Customers 28 30 46
Services performed over time      
Disaggregation of Revenue [Line Items]      
Total Revenue from Contracts with Customers 6,048 6,438 6,788
Voice and Other      
Disaggregation of Revenue [Line Items]      
Total operating revenue 1,749 2,099 2,281
Adjustments for Non-ASC 606 Revenue (197) (334) (352)
Total Revenue from Contracts with Customers 1,552 1,765 1,929
Fiber Infrastructure      
Disaggregation of Revenue [Line Items]      
Total operating revenue 1,955 1,990 2,033
Adjustments for Non-ASC 606 Revenue (131) (120) (123)
Total Revenue from Contracts with Customers 1,824 1,870 1,910
IP and Data Services      
Disaggregation of Revenue [Line Items]      
Total operating revenue 451 473 512
Adjustments for Non-ASC 606 Revenue 0 0 0
Total Revenue from Contracts with Customers 451 473 512
Affiliate Services      
Disaggregation of Revenue [Line Items]      
Total operating revenue 2,294 2,389 2,487
Adjustments for Non-ASC 606 Revenue (45) (29) (4)
Total Revenue from Contracts with Customers $ 2,249 $ 2,360 $ 2,483