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Property, Plant And Equipment (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]        
Proceeds from sale of property $ 63 $ 18 $ 3,148  
Proceeds from sale and lease-back transactions   30 $ 70
Property, plant and equipment 16,324 19,318 16,324  
Capital expenditures   2,783 3,211 $ 2,738
Vendor financing payments   463    
Accounts payable associated with capital   585    
Accounts payable and accrued liabilities associated with capital   8    
Other liabilities associated with capital expenditures   24    
Vendor financing payables associated with capital expenditures   16    
Capitalized interest   49    
Land and Building [Member]        
Property, Plant and Equipment [Line Items]        
Aggregate carrying value   11    
Gain (Loss) on sale of property   7    
Capital Leases [Member]        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment, net 179 246 179  
Towers [Member]        
Property, Plant and Equipment [Line Items]        
Proceeds from sale of property 47      
Gain (Loss) on sale of property 28      
Property, plant and equipment 19   19  
Materials And Supplies [Member]        
Property, Plant and Equipment [Line Items]        
Property, plant and equipment $ 594 $ 431 $ 594