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Debt and Other Obligations (Indebtedness) (Details) - USD ($)
 9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 24,063,000,000 $ 22,921,000,000
Less: current maturities of debt and other obligations 611,000,000 835,000,000
Non-current portion of long-term debt and other long-term obligations 23,452,000,000 22,086,000,000
Finance Lease Obligations 30,000,000 18,000,000
2015 Tower Revenue Notes 3.663% due 2045 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 700,000,000  
2018 Tower Revenue Notes 4.241% due 2048 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 750,000,000  
Fixed Rate Securitized Debt July 2018 Tower Revenue Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Increase (Decrease) 5.00%  
Securitized Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 1,781,000,000 1,754,000,000
Securitized Debt [Member] | Fixed Rate Debt 2009 Securitized Notes A-2 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 9.00%  
Debt and Finance Lease Obligations $ 34,000,000 40,000,000
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.663% due 2045 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.70%  
Debt and Finance Lease Obligations [3] $ 699,000,000 698,000,000
Securitized Debt [Member] | 2018 Tower Revenue Notes 4.241% due 2048 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.20%  
Debt and Finance Lease Obligations [3] $ 747,000,000 746,000,000
Installment Purchase Liabilities and Finance Leases | Securitized Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations [4],[5] $ 301,000,000 270,000,000
Bank Debt [Member] | 2016 Term Loan A [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2],[6] 6.40%  
Debt and Finance Lease Obligations $ 1,132,000,000 1,162,000,000
Bank Debt [Member] | Commercial Paper [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.50%  
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 3.20%  
Debt and Finance Lease Obligations $ 0 [7] 749,000,000
High Yield Bonds [Member] | June 2020 Senior Unsecured 1.350% Notes [Domain]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 1.40%  
Debt and Finance Lease Obligations $ 499,000,000 498,000,000
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 4.450% [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.50%  
Debt and Finance Lease Obligations $ 898,000,000 898,000,000
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.7% [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.70%  
Debt and Finance Lease Obligations $ 749,000,000 748,000,000
High Yield Bonds [Member] | February 2021 Senior Unsecured 1.050% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 1.10%  
Debt and Finance Lease Obligations $ 996,000,000 994,000,000
High Yield Bonds [Member] | 4.000% Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.00%  
Debt and Finance Lease Obligations $ 498,000,000 498,000,000
High Yield Bonds [Member] | 2.900% Senior Unsecured Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 2.90%  
Debt and Finance Lease Obligations $ 745,000,000 744,000,000
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.650% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.70%  
Debt and Finance Lease Obligations $ 997,000,000 997,000,000
High Yield Bonds [Member] | January 2023 Senior Unsecured 5.000% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.00%  
Debt and Finance Lease Obligations $ 993,000,000 991,000,000
High Yield Bonds [Member] | 3.800% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.80%  
Debt and Finance Lease Obligations $ 996,000,000 995,000,000
High Yield Bonds [Member] | 4.800% Senior Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.80%  
Debt and Finance Lease Obligations $ 595,000,000 594,000,000
High Yield Bonds [Member] | February 2019 Senior Unsecured 4.300% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.30%  
Debt and Finance Lease Obligations $ 596,000,000 595,000,000
High Yield Bonds [Member] | December 2023 Senior Unsecured 5.600% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.60%  
Debt and Finance Lease Obligations $ 742,000,000 740,000,000
High Yield Bonds [Member] | August 2024 Senior Unsecured 4.900% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 550,000,000  
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.90%  
Debt and Finance Lease Obligations $ 543,000,000 [8] 0
High Yield Bonds [Member] | August 2019 Senior Unsecured 3.100% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.10%  
Debt and Finance Lease Obligations $ 547,000,000 546,000,000
High Yield Bonds [Member] | April 2020 Senior Unsecured 3.300% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.30%  
Debt and Finance Lease Obligations $ 742,000,000 741,000,000
High Yield Bonds [Member] | June 2020 Senior Unsecured 2.250% Notes [Domain]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 2.30%  
Debt and Finance Lease Obligations $ 1,092,000,000 1,091,000,000
High Yield Bonds [Member] | February 2021 Senior Unsecured 2.100% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 2.10%  
Debt and Finance Lease Obligations $ 991,000,000 990,000,000
High Yield Bonds [Member] | June 2021 Senior Unsecured 2.500% Notes [Domain]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 2.50%  
Debt and Finance Lease Obligations $ 743,000,000 743,000,000
High Yield Bonds [Member] | 5.100% Senior Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.10%  
Debt and Finance Lease Obligations $ 743,000,000 743,000,000
High Yield Bonds [Member] | December 2023 Senior Unsecured 5.800% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.80%  
Debt and Finance Lease Obligations $ 742,000,000 740,000,000
High Yield Bonds [Member] | August 2024 Senior Unsecured 5.200% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 700,000,000  
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.20%  
Debt and Finance Lease Obligations $ 689,000,000 [8] 0
High Yield Bonds [Member] | February 2021 Senior Unsecured 2.900% Notes    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 2.90%  
Debt and Finance Lease Obligations $ 1,235,000,000 1,234,000,000
High Yield Bonds [Member] | 4.750% Senior Unsecured Notes [Member] [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.80%  
Debt and Finance Lease Obligations $ 344,000,000 344,000,000
High Yield Bonds [Member] | February 2019 Senior Unsecured 5.200% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.20%  
Debt and Finance Lease Obligations $ 396,000,000 396,000,000
High Yield Bonds [Member] | August 2019 Senior Unsecured 4.000% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.00%  
Debt and Finance Lease Obligations $ 346,000,000 346,000,000
High Yield Bonds [Member] | April 2020 Senior Unsecured 4.150% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 4.20%  
Debt and Finance Lease Obligations $ 490,000,000 490,000,000
High Yield Bonds [Member] | June 2020 Senior Unsecured 3.250% Notes [Domain]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.30%  
Debt and Finance Lease Obligations $ 891,000,000 890,000,000
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 22,282,000,000 21,167,000,000
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, Interest Rate, Stated Percentage 8.00%  
Maximum [Member] | Installment purchases    
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Range 20 years  
Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.00%  
Minimum [Member] | Installment purchases    
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Range one year  
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Maximum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.75%  
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.875%  
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unused Borrowing Capacity, Amount $ 7,000,000,000.0  
Debt and Finance Lease Obligations [6],[9] $ 0 670,000,000
Revolving Credit Facility [Member] | Maximum [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.30%  
Revolving Credit Facility [Member] | Minimum [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.08%  
Commercial Paper [Member] | Bank Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 1,312,000,000 [10] $ 0
Debt Instrument, Maturity Date, Description 397 days  
Commercial Paper [Member] | Maximum [Member] | Bank Debt [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Maturity Date, Description three months  
Term SOFR Adjustment    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.10%  
[1] Represents the weighted-average stated interest rate, as applicable.
[2] See the 2023 Form 10-K, including note 7 to the consolidated financial statements, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.
[3] 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 September 30, 2024, the Tower Revenue Notes, Series 2015-2 and Series 2018-2 have principal amounts of $700 million and $750 million, with anticipated repayment dates in 2025 and 2028, respectively.
[4] 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.
[5] For the periods ended September 30, 2024 and December 31, 2023, reflects $30 million and $18 million, respectively, in finance lease obligations (primarily related to vehicles).
[6] Both the 2016 Revolver and the 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 the 2023 Form 10-K, including note 7 to the consolidated financial statements, for information regarding potential adjustments to such percentages.
[7] In September 2024, the Company repaid in full the 3.200% Senior Notes on the contractual maturity date.
[8] In August 2024, the Company issued $550 million aggregate principal amount of 4.900% senior unsecured notes due 2029 and $700 million aggregate principal amount of 5.200% senior unsecured notes due 2034 (collectively, "August 2024 Senior Notes"). The Company used the net proceeds from the August 2024 Senior Notes offering to repay a portion of the outstanding indebtedness under the Company's unsecured commercial paper program ("CP Program") and pay related fees and expenses
[9] As of September 30, 2024, the undrawn availability under the Company's senior unsecured revolving credit facility ("2016 Revolver") was $7.0 billion.
[10] The maturities of the Commercial Paper Notes, when outstanding, may vary but may not exceed 397 days from the date of issue, but there were no Commercial Paper Notes issued or outstanding during the period that had original maturities greater than three months. The Commercial Paper Notes are issued under customary terms in the commercial paper market and are issued at a discount from par or, alternatively, can be issued at par and bear varying interest rates on a fixed or floating basis. At any point in time, the Company intends to maintain available commitments under its 2016 Revolver in an amount at least equal to the amount of Commercial Paper Notes outstanding. While any outstanding Commercial Paper Notes generally have short-term maturities, the Company classifies the outstanding issuances, when applicable, as long-term based on its ability and intent to refinance the outstanding issuances on a long-term basis.