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Debt and Other Obligations (Indebtedness) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 22,332 $ 21,729
Less: current maturities of debt and other obligations 819 819
Non-current portion of long-term debt and other long-term obligations 21,513 20,910
2015 Tower Revenue Notes 3.663% due 2045 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 700  
2018 Tower Revenue Notes 4.241% due 2048 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount $ 750  
Fixed Rate Securitized Debt July 2018 Tower Revenue Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Increase (Decrease) 5.00%  
Finance Lease Obligations and Other [Member] | Securitized Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 257 246
High Yield Bonds [Member] | 3.150% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.20%  
Debt and Finance Lease Obligations $ 749 749
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 3.20%  
Debt and Finance Lease Obligations $ 748 748
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 $ 497 497
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 $ 897 896
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 $ 747 747
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 $ 993 992
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 $ 497 497
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 $ 743 742
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 $ 996 996
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 $ 990 0
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 $ 993 993
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 $ 595 594
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 $ 545 545
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 $ 740 739
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 $ 1,091 1,090
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 $ 989 989
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 $ 742 742
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 $ 1,234 1,233
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 $ 344 344
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 $ 396 396
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 $ 346 346
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 $ 490 490
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 $ 890 890
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations 20,587 19,993
Securitized Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 1,745 1,736
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 $ 45 47
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 $ 698 698
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 $ 745 745
Bank Debt [Member] | 2016 Term Loan A [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2],[3] 6.00%  
Debt and Finance Lease Obligations $ 1,184 1,192
Bank Debt [Member] | Commercial Paper [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2] 5.60%  
Bank Debt [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [1],[2],[3] 5.90%  
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Commercial Paper - Outstanding $ 717  
Maximum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.75%  
Maximum [Member] | Finance Lease Obligations and Other [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 10.00%  
Maximum [Member] | Finance Lease Obligations and Other [Member]    
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Range 25 years  
Minimum [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.00%  
Minimum [Member] | Finance Lease Obligations and Other [Member]    
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 $ 5,500  
Debt and Finance Lease Obligations 1,434 [4] 1,305
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 717 [5] $ 1,241
Debt Instrument, Maturity Date, Description 397 days  
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 2022 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] 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 2022 Form 10-K, including note 7 to the consolidated financial statements, for information regarding potential adjustments to such percentages.
[4] As of March 31, 2023, the undrawn availability under the Company's senior unsecured revolving credit facility ("2016 Revolver") was $5.5 billion. See note 12.
[5] The maturities of the Commercial Paper Notes, when outstanding, may vary but may not exceed 397 days from the date of issue. 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. As of March 31, 2023, the Company had net issuances of $717 million under the CP Program. 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.