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Debt and Other Obligations (Indebtedness) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 18,695 $ 18,121
Less: current maturities and short-term debt and other current obligations 949 100
Non-current portion of long-term debt and other long-term obligations 17,746 18,021
2016 Revolver [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Unused Borrowing Capacity, Amount 3,700  
2015 Tower Revenue Notes 3.222% due 2042 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 300  
2015 Tower Revenue Notes 3.663% due 2045 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 700  
2018 Tower Revenue Notes 3.720% due 2043 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Face Amount 250  
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 [1] $ 221 227
High Yield Bonds [Member] | 5.250% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 5.30%  
Debt and Finance Lease Obligations $ 1,644 1,644
High Yield Bonds [Member] | 4.875% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.90%  
Debt and Finance Lease Obligations $ 846 846
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.40% [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.40%  
Debt and Finance Lease Obligations $ 850 850
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 4.450% [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.50%  
Debt and Finance Lease Obligations $ 893 893
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.7% [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.70%  
Debt and Finance Lease Obligations $ 745 744
High Yield Bonds [Member] | 2.250% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 2.30%  
Debt and Finance Lease Obligations $ 698 698
High Yield Bonds [Member] | 4.000% Senior Unsecured Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.00%  
Debt and Finance Lease Obligations $ 495 495
High Yield Bonds [Member] | 4.750% Senior Unsecured Notes [Member] [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.80%  
Debt and Finance Lease Obligations $ 344 344
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.20%  
Debt and Finance Lease Obligations $ 745 744
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.650% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.70%  
Debt and Finance Lease Obligations $ 993 993
High Yield Bonds [Member] | 3.150% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.20%  
Debt and Finance Lease Obligations $ 744 744
High Yield Bonds [Member] | 3.800% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.80%  
Debt and Finance Lease Obligations $ 990 990
High Yield Bonds [Member] | February 2019 Senior Unsecured 4.300% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.30%  
Debt and Finance Lease Obligations $ 592 592
High Yield Bonds [Member] | February 2019 Senior Unsecured 5.200% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 5.20%  
Debt and Finance Lease Obligations $ 395 395
High Yield Bonds [Member] | August 2019 Senior Unsecured 3.100% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.10%  
Debt and Finance Lease Obligations $ 544 543
High Yield Bonds [Member] | August 2019 Senior Unsecured 4.000% Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.00%  
Debt and Finance Lease Obligations $ 345 345
Unsecured Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations 15,428 14,850
Securitized Debt [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations $ 3,267 3,271
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.222% due 2042 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.20%  
Debt and Finance Lease Obligations [3] $ 299 298
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.663% due 2045 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.70%  
Debt and Finance Lease Obligations [3] $ 695 694
Securitized Debt [Member] | 2018 Tower Revenue Notes 3.720% due 2043 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.70%  
Debt and Finance Lease Obligations [3] $ 248 248
Securitized Debt [Member] | 2018 Tower Revenue Notes 4.241% due 2048 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 4.20%  
Debt and Finance Lease Obligations [3] $ 742 742
Securitized Debt [Member] | 3.849% Secured Notes [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 3.90%  
Debt and Finance Lease Obligations $ 996 995
Securitized Debt [Member] | Fixed Rate Debt 2009 Securitized Notes A-2 [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2] 9.00%  
Debt and Finance Lease Obligations $ 66 67
Bank Debt [Member] | 2016 Revolver [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2],[4] 2.10%  
Debt and Finance Lease Obligations $ 1,270 [5] 525
Bank Debt [Member] | 2016 Term Loan A [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage [2],[4] 2.10%  
Debt and Finance Lease Obligations $ 2,295 2,310
Commercial Paper [Member]    
Debt Instrument [Line Items]    
Debt and Finance Lease Obligations [6] $ 0 $ 155
Maximum [Member] | 2016 Revolver [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] | 2016 Revolver [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.35%  
Maximum [Member] | Finance Lease Obligations and Other [Member]    
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Range 30 years  
Minimum [Member] | 2016 Revolver [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.00%  
Minimum [Member] | 2016 Revolver [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Commitment Fee Percentage 0.125%  
Minimum [Member] | Finance Lease Obligations and Other [Member]    
Debt Instrument [Line Items]    
Debt Instrument Maturity Date Range one year  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member] | 2016 Revolver [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 1.75%  
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | 2016 Revolver [Member]    
Debt Instrument [Line Items]    
Debt Instrument, Interest Rate, Stated Percentage 0.875%  
[1]
The Company's finance leases and other obligations relate to land, fiber, vehicles, and other assets and bear interest rates ranging up to 10% and mature in periods ranging from less than one year to approximately 30 years.
[2]
See the 2019 Form 10-K, including note 9, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.
[3]
If the respective series of 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) 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 March 31, 2020, the Tower Revenue Notes have principal amounts of $300 million, $250 million, $700 million and $750 million, with anticipated repayment dates in 2022, 2023, 2025 and 2028, respectively.
[4] Both the 2016 Revolver and 2016 Term Loan A bear interest, at our option, at either (1) LIBOR plus 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 0.125% to 0.350%, based on the Company's senior unsecured debt rating, per annum on the undrawn available amount under the 2016 Revolver.
[5]
As of March 31, 2020, the undrawn availability under the 2016 Revolver was $3.7 billion.
[6]
Notes under the CP Program may be issued, repaid and re-issued from time to time, with an aggregate principal amount of Commercial Paper Notes outstanding under the CP Program at any time not to exceed $1.0 billion. The net proceeds of the Commercial Paper Notes are expected to be used for general corporate purposes. The maturities of the 2019 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, 2020, there were no outstanding Commercial Paper Notes. 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 issuances 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.