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Background and Summary of Significant Accounting Policies - Change in Accounting Estimates (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2024
Property, Plant and Equipment [Line Items]        
Depreciation $ (712) $ (756) $ (781)  
Change in Accounting Method Accounted for as Change in Estimate        
Property, Plant and Equipment [Line Items]        
Depreciation 101      
Depreciation, net of tax 77      
Service Life        
Property, Plant and Equipment [Line Items]        
Depreciation 24      
Depreciation, net of tax $ 18      
Fiber Network Assets        
Property, Plant and Equipment [Line Items]        
Estimated economic life   25 years   30 years