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Debt and Other Obligations (Indebtedness) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Sep. 30, 2024
Dec. 31, 2023
Dec. 31, 2018
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]            
Total debt and other obligations $ 24,081   $ 22,921      
Less: current maturities and short-term debt and other current obligations 610   835      
Non-current portion of long-term debt and other long-term obligations $ 23,471   22,086      
Max duration of CP 397          
Finance Lease Obligations $ 35   18      
Secured Debt [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations 1,778   1,754      
Unsecured Debt [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 22,303   21,167      
Minimum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 0.00%          
Minimum [Member] | Installment Purchase Liabilities and Finance Leases            
Debt Instrument [Line Items]            
Debt Instrument Maturity Date Range one year          
Maximum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 0.75%          
Maximum [Member] | Installment Purchase Liabilities and Finance Leases            
Debt Instrument [Line Items]            
Debt Instrument Maturity Date Range 20 years          
Fixed Rate Debt 2009 Securitized Notes A-2 [Member] | Secured Debt [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 32   40      
Debt Instrument, Interest Rate, Stated Percentage [1] 9.00%          
2015 Tower Revenue Notes 3.663% due 2045 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 700          
Debt Instrument, Face Amount 700          
2015 Tower Revenue Notes 3.663% due 2045 [Member] | Secured Debt [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations [2] $ 700   698      
Debt Instrument, Interest Rate, Stated Percentage 3.70% [1]         3.663%
Debt Instrument, Face Amount           $ 700
Debt Instrument, Face Amount           $ 700
2018 Tower Revenue Notes 4.241% due 2048 [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Face Amount $ 750          
Debt Instrument, Face Amount 750          
2018 Tower Revenue Notes 4.241% due 2048 [Member] | Secured Debt [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations [2] $ 747   746      
Debt Instrument, Interest Rate, Stated Percentage 4.20% [1]     4.241%    
Debt Instrument, Face Amount       $ 750    
Debt Instrument, Face Amount       $ 750    
Installment Purchase Liabilities and Finance Leases | Maximum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 8.00%          
2016 Term Loan A [Member] | Bank Debt [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 1,117   1,162      
Debt Instrument, Interest Rate, Stated Percentage [1],[3] 5.60%          
Debt Instrument, Face Amount         $ 2,000  
Debt Instrument, Face Amount         $ 2,000  
August 2017 Senior Unsecured 3.200% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 0 [4]   749      
Debt Instrument, Interest Rate, Stated Percentage   3.20%        
June 2020 Senior Unsecured 1.350% Notes [Domain] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 499   498      
Debt Instrument, Interest Rate, Stated Percentage [1],[5] 1.35%          
Senior Unsecured 2016 Notes 4.450% [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 899   898      
Debt Instrument, Interest Rate, Stated Percentage [1] 4.50%          
Senior Unsecured 2016 Notes 3.7% [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 749   748      
Debt Instrument, Interest Rate, Stated Percentage [1] 3.70%          
February 2021 Senior Unsecured 1.050% Notes [Domain] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 997   994      
Debt Instrument, Interest Rate, Stated Percentage [1] 1.10%          
4.000% Senior Unsecured Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 498   498      
Debt Instrument, Interest Rate, Stated Percentage [1] 4.00%          
2.9000% Senior Unsecured Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 746   744      
Debt Instrument, Interest Rate, Stated Percentage [1] 2.90%          
August 2017 Senior Unsecured 3.650% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 997   997      
Debt Instrument, Interest Rate, Stated Percentage [1] 3.70%          
January 2023 Senior Unsecured 5.000% Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 993   $ 991      
Debt Instrument, Interest Rate, Stated Percentage 5.00% [1]   5.00%      
Debt Instrument, Face Amount     $ 1,000      
Debt Instrument, Face Amount     1,000      
3.800% Senior Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 996   995      
Debt Instrument, Interest Rate, Stated Percentage [1] 3.80%          
April 2023 4.800% Senior Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 595   $ 594      
Debt Instrument, Interest Rate, Stated Percentage 4.80% [1]   4.80%      
Debt Instrument, Face Amount     $ 600      
Debt Instrument, Face Amount     600      
February 2019 Senior Unsecured 4.300% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 596   595      
Debt Instrument, Interest Rate, Stated Percentage [1] 4.30%          
December 2023 Senior Unsecured 5.600% Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 742   $ 740      
Debt Instrument, Interest Rate, Stated Percentage 5.60% [1]   5.60%      
Debt Instrument, Face Amount     $ 750      
Debt Instrument, Face Amount     750      
August 2024 Senior Unsecured 4.900% Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 544 [6]   0      
Debt Instrument, Interest Rate, Stated Percentage [1] 4.90%          
Debt Instrument, Face Amount $ 550          
Debt Instrument, Face Amount 550          
August 2019 Senior Unsecured 3.100% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 547   546      
Debt Instrument, Interest Rate, Stated Percentage [1] 3.10%          
April 2020 Senior Unsecured 3.300% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 742   741      
Debt Instrument, Interest Rate, Stated Percentage [1] 3.30%          
June 2020 Senior Unsecured 2.250% Notes [Domain] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 1,093   1,091      
Debt Instrument, Interest Rate, Stated Percentage [1] 2.30%          
February 2021 Senior Unsecured 2.100% Notes [Domain] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 991   990      
Debt Instrument, Interest Rate, Stated Percentage [1] 2.10%          
June 2021 Senior Unsecured 2.500% Notes [Domain] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 744   743      
Debt Instrument, Interest Rate, Stated Percentage [1] 2.50%          
April 2023 Senior Unsecured 5.100% Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 743   $ 743      
Debt Instrument, Interest Rate, Stated Percentage 5.10% [1]   5.10%      
Debt Instrument, Face Amount     $ 750      
Debt Instrument, Face Amount     750      
December 2023 Senior Unsecured 5.800% Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 742   $ 740      
Debt Instrument, Interest Rate, Stated Percentage 5.80% [1]   5.80%      
Debt Instrument, Face Amount     $ 750      
Debt Instrument, Face Amount     750      
August 2024 Senior Unsecured 5.200% Notes | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 689 [6]   0      
Debt Instrument, Interest Rate, Stated Percentage [1] 5.20%          
Debt Instrument, Face Amount $ 700          
Debt Instrument, Face Amount 700          
February 2021 Senior Unsecured 2.900% Notes [Domain] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 1,235   1,234      
Debt Instrument, Interest Rate, Stated Percentage [1] 2.90%          
4.750% Senior Unsecured Notes [Member] [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 345   344      
Debt Instrument, Interest Rate, Stated Percentage [1] 4.80%          
February 2019 Senior Unsecured 5.200% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 396   396      
Debt Instrument, Interest Rate, Stated Percentage [1] 5.20%          
August 2019 Senior Unsecured 4.000% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 346   346      
Debt Instrument, Interest Rate, Stated Percentage [1] 4.00%          
April 2020 Senior Unsecured 4.150% Notes [Member] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 490   490      
Debt Instrument, Interest Rate, Stated Percentage [1] 4.20%          
June 2020 Senior Unsecured 3.250% Notes [Domain] | Bonds [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 891   890      
Debt Instrument, Interest Rate, Stated Percentage [1] 3.30%          
Tower Revenue Notes [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Increase (Decrease) 5.00%          
Secured Debt [Member] | Installment Purchase Liabilities and Finance Leases            
Debt Instrument [Line Items]            
Total debt and other obligations [7],[8] $ 299   270      
Revolving Credit Facility [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations 0 [9]   670      
Line of Credit Facility, Remaining Borrowing Capacity $ 7,000          
Revolving Credit Facility [Member] | Minimum [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Commitment Fee Percentage 0.08%          
Revolving Credit Facility [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Line of Credit Facility, Commitment Fee Percentage 0.30%          
Commercial Paper [Member]            
Debt Instrument [Line Items]            
Total debt and other obligations $ 1,341 [10]   $ 0      
Debt Instrument, Interest Rate, Stated Percentage [10] 5.00%          
Term SOFR Adjustment            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 0.10%          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 0.875%          
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum [Member]            
Debt Instrument [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage 1.75%          
[1] Represents the weighted-average stated interest rate, as applicable.
[2] If the Tower Revenue Notes, Series 2015-2 and Series 2018-2 (collectively, "Tower Revenue Notes") are not paid in full on or prior to an applicable anticipated repayment date, then Excess Cash Flow (as defined in the indenture governing the terms of such notes) of the issuers of such notes will be used to repay principal of the applicable series and class of the Tower Revenue Notes, and additional interest (of an additional approximately 5% per annum) will accrue on the respective Tower Revenue Notes. As of December 31, 2024, the Tower Revenue Notes, Series 2015-2 and 2018-2 have principal amounts of $700 million and $750 million, with anticipated repayment dates in 2025 and 2028, respectively.
[3] Both the 2016 Revolver and senior unsecured term loan A facility ("2016 Term Loan A" and, collectively, "2016 Credit Facility") bear interest, at the Company's option, at either (1) Term SOFR plus (i) a credit spread adjustment of 0.10% per annum and (ii) a credit spread ranging from 0.875% to 1.750% per annum or (2) an alternate base rate plus a credit spread ranging from 0.000% to 0.750% per annum, in each case, with the applicable credit spread based on the Company's senior unsecured debt rating. The Company pays a commitment fee ranging from 0.080% to 0.300%, based on the Company's senior unsecured debt rating, per annum on the undrawn available amount under the 2016 Revolver. See further discussion below regarding potential adjustments to such percentages.
[4] In September 2024, the Company repaid in full the 3.200% senior unsecured notes on the contractual maturity date.
[5] Predominately consists of outstanding indebtedness under the CP Program and the 1.350% senior unsecured notes due July 2025.
[6] See "Bonds—Senior Notes" below for further discussion of senior unsecured notes issued during 2024.
[7] For the years ended December 31, 2024 and December 31, 2023, reflects $35 million and $18 million, respectively, in finance lease obligations (primarily related to vehicles).
[8] The Company's installment purchases primarily relate to land and bear interest rates up to 8% and mature in periods ranging from less than one year to approximately 20 years.
[9] As of December 31, 2024, the undrawn availability under the senior unsecured revolving credit facility ("2016 Revolver") was $7.0 billion.
[10] The maturities of the Commercial Paper Notes, as defined below, when outstanding, may vary but may not exceed 397 days from the date of issue. There were no Commercial Paper Notes issued or outstanding during the period that had original maturities greater than three months.