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Debt and Other Obligations (Debt Purchases and Repayments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Extinguishment of Debt [Line Items]      
Principal amount $ 750 $ 750 $ 1,250
Cash paid [1] 750 750 1,274
Gains (losses) on retirement of long-term obligations [2] 0 0 (28)
2018 Tower Revenue Notes 3.720% due 2043 [Member]      
Extinguishment of Debt [Line Items]      
Principal amount     250
Cash paid [1]     252
Gains (losses) on retirement of long-term obligations [2]     (3)
3.849% Secured Notes [Member]      
Extinguishment of Debt [Line Items]      
Principal amount     1,000
Cash paid [1]     1,022
Gains (losses) on retirement of long-term obligations [2]     (23)
Revolving Credit Facility [Member]      
Extinguishment of Debt [Line Items]      
Principal amount     0
Cash paid [1]     0
Gains (losses) on retirement of long-term obligations [2]     $ (2)
3.150% Senior Notes [Member]      
Extinguishment of Debt [Line Items]      
Principal amount   750  
Cash paid [1]   750  
Gains (losses) on retirement of long-term obligations [2] 0 $ 0  
August 2017 Senior Unsecured 3.200% Notes [Member]      
Extinguishment of Debt [Line Items]      
Principal amount 750    
Cash paid [1] $ 750    
[1] Exclusive of accrued interest.
[2] Inclusive of the write-off of the respective deferred financing costs