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Debt and Other Obligations (Indebtedness) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations $ 16,424     $ 16,424 $ 16,159
Less: current maturities and short-term debt and other current obligations 111     111 115
Non-current portion of long-term debt and other long-term obligations 16,313     16,313 16,044
3.150% Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     $ 750    
Debt Instrument, Maturity Date     Jul. 01, 2023    
Debt Instrument, Interest Rate, Stated Percentage     3.20%    
3.800% Senior Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     $ 1,000    
Debt Instrument, Maturity Date     Feb. 01, 2028    
Debt Instrument, Interest Rate, Stated Percentage     3.80%    
Variable Rate Revolver 2016 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Maturity Date   Jun. 01, 2023      
Credit Facility Amendment, Date   Jun. 01, 2018      
Line of Credit Facility, Change in Borrowing Capacity   $ 750      
Line of Credit Facility, Maximum Borrowing Capacity   $ 4,250      
Debt Instrument, Unused Borrowing Capacity, Amount 3,400     $ 3,400  
Capital Lease Obligations and Other [Member]          
Debt Instrument [Line Items]          
Contractual maturity date [1]       Various  
Original Debt Issuance Date       Various  
Percentage of debt instrument interest rate stated [1]       Various  
Debt and Capital Lease Obligations 224     $ 224 227
Fixed Rate Securitized Debt 2010 Tower Revenue Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument Additional Interest Rate if not Repaid Prior to Applicable Date       5.00%  
January 2018 Senior Note [Member]          
Debt Instrument [Line Items]          
Original issue date     Jan. 01, 2018    
2018 Tower Revenue Notes 3.720% due 2043 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 250     $ 250  
Debt Instrument, Maturity Date Jul. 01, 2043        
Debt Instrument, Interest Rate, Stated Percentage 3.70%     3.70%  
2018 Tower Revenue Notes 4.241% due 2048 [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 750     $ 750  
Debt Instrument, Maturity Date Jul. 01, 2048        
Debt Instrument, Interest Rate, Stated Percentage 4.20%     4.20%  
July 2018 Tower Revenue Notes [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount $ 1,000     $ 1,000  
Original issue date       Jul. 01, 2018  
2018 Tower Revenue Notes Risk Retention Tranche [Member]          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 53     $ 53  
Bank Debt [Member]          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations $ 3,173     $ 3,173 3,377
Bank Debt [Member] | Variable Rate Revolver 2016 [Member]          
Debt Instrument [Line Items]          
Original issue date       Jan. 01, 2016  
Debt Instrument, Maturity Date [2]       Jun. 01, 2023  
Debt Instrument, Interest Rate, Stated Percentage [2] 3.50%     3.50%  
Debt and Capital Lease Obligations $ 805 [2],[3],[4]     $ 805 [2],[3],[4] 980
Bank Debt [Member] | Variable Rate 2016 Term Loan A [Member]          
Debt Instrument [Line Items]          
Original issue date       Jan. 01, 2016  
Debt Instrument, Maturity Date [2]       Jun. 01, 2023  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.50%     3.50%  
Debt and Capital Lease Obligations $ 2,368     $ 2,368 2,397
Securitized Debt [Member]          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations $ 2,065     $ 2,065 3,332
Securitized Debt [Member] | Fixed Rate Debt 2009 Securitized Notes First Tranche [Member]          
Debt Instrument [Line Items]          
Original issue date       Jul. 01, 2009  
Debt Instrument, Maturity Date [1]       Aug. 01, 2019  
Debt Instrument, Interest Rate, Stated Percentage [1] 6.30%     6.30%  
Debt and Capital Lease Obligations $ 17     $ 17 32
Securitized Debt [Member] | Fixed Rate Securitized Debt January 2010 Tower Revenue Notes Third Tranche [Member]          
Debt Instrument [Line Items]          
Original issue date       Jan. 01, 2010  
Debt Instrument, Maturity Date [5]       Jan. 01, 2040  
Debt and Capital Lease Obligations 0 [4]     $ 0 [4] 1,246
Securitized Debt [Member] | Fixed Rate Securitized Debt August 2010 Tower Revenue Notes Third Tranche [Member]          
Debt Instrument [Line Items]          
Original issue date       Aug. 01, 2010  
Debt Instrument, Maturity Date [5]       Aug. 01, 2040  
Debt and Capital Lease Obligations $ 0 [6]     $ 0 [6] 995
Securitized Debt [Member] | Fixed Rate Debt 2009 Securitized Notes Second Tranche [Member]          
Debt Instrument [Line Items]          
Original issue date       Jul. 01, 2009  
Debt Instrument, Maturity Date [1]       Aug. 01, 2029  
Debt Instrument, Interest Rate, Stated Percentage [1] 9.00%     9.00%  
Debt and Capital Lease Obligations $ 70     $ 70 70
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.222% due 2042 [Member]          
Debt Instrument [Line Items]          
Original issue date       May 01, 2015  
Debt Instrument, Maturity Date [5]       May 01, 2042  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.20%     3.20%  
Debt and Capital Lease Obligations $ 298     $ 298 297
Securitized Debt [Member] | 2015 Tower Revenue Notes 3.663% due 2045 [Member]          
Debt Instrument [Line Items]          
Original issue date       May 01, 2015  
Debt Instrument, Maturity Date [5]       May 01, 2045  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.70%     3.70%  
Debt and Capital Lease Obligations $ 693     $ 693 692
Securitized Debt [Member] | 2018 Tower Revenue Notes 3.720% due 2043 [Member]          
Debt Instrument [Line Items]          
Original issue date Jul. 01, 2018        
Debt Instrument, Maturity Date [5]       Jul. 15, 2043  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.70%     3.70%  
Debt and Capital Lease Obligations $ 247 [6]     $ 247 [6] 0
Securitized Debt [Member] | 2018 Tower Revenue Notes 4.241% due 2048 [Member]          
Debt Instrument [Line Items]          
Original issue date Jul. 01, 2018        
Debt Instrument, Maturity Date [5]       Jul. 15, 2048  
Debt Instrument, Interest Rate, Stated Percentage [1] 4.20%     4.20%  
Debt and Capital Lease Obligations $ 740 [6]     $ 740 [6] 0
High Yield Bonds [Member]          
Debt Instrument [Line Items]          
Debt and Capital Lease Obligations $ 10,962     $ 10,962 9,223
High Yield Bonds [Member] | September 2016 Senior Unsecured Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Sep. 01, 2016  
Debt Instrument, Maturity Date [1]       Sep. 01, 2021  
Debt Instrument, Interest Rate, Stated Percentage [1] 2.30%     2.30%  
Debt and Capital Lease Obligations $ 696     $ 696 695
High Yield Bonds [Member] | February 2017 Senior Unsecured Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Feb. 01, 2017  
Debt Instrument, Maturity Date [1]       Mar. 01, 2027  
Debt Instrument, Interest Rate, Stated Percentage [1] 4.00%     4.00%  
Debt and Capital Lease Obligations $ 494     $ 494 494
High Yield Bonds [Member] | May 2017 Senior Unsecured Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       May 01, 2017  
Debt Instrument, Maturity Date [1]       May 01, 2047  
Debt Instrument, Interest Rate, Stated Percentage [1] 4.80%     4.80%  
Debt and Capital Lease Obligations $ 343     $ 343 343
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Aug. 01, 2017  
Debt Instrument, Maturity Date [1]       Sep. 01, 2024  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.20%     3.20%  
Debt and Capital Lease Obligations $ 743     $ 743 742
High Yield Bonds [Member] | August 2017 Senior Unsecured 3.650% Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Aug. 01, 2017  
Debt Instrument, Maturity Date [1]       Sep. 01, 2027  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.70%     3.70%  
Debt and Capital Lease Obligations $ 992     $ 992 991
High Yield Bonds [Member] | 3.150% Senior Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Jan. 01, 2018  
Debt Instrument, Maturity Date [1]       Jul. 01, 2023  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.20%     3.20%  
Debt and Capital Lease Obligations $ 742 [4]     $ 742 [4] 0
High Yield Bonds [Member] | 3.800% Senior Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Jan. 01, 2018  
Debt Instrument, Maturity Date [1]       Feb. 01, 2028  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.80%     3.80%  
Debt and Capital Lease Obligations $ 988 [4]     $ 988 [4] 0
High Yield Bonds [Member] | Five and One Fourth Senior Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Oct. 01, 2012  
Debt Instrument, Maturity Date [1]       Jan. 15, 2023  
Debt Instrument, Interest Rate, Stated Percentage [1] 5.30%     5.30%  
Debt and Capital Lease Obligations $ 1,641     $ 1,641 1,639
High Yield Bonds [Member] | 2012 secured notes tranche B [Member]          
Debt Instrument [Line Items]          
Original issue date       Dec. 01, 2012  
Debt Instrument, Maturity Date [1]       Apr. 15, 2023  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.90%     3.90%  
Debt and Capital Lease Obligations $ 994     $ 994 993
High Yield Bonds [Member] | 4.875% Senior Notes [Member]          
Debt Instrument [Line Items]          
Original issue date       Apr. 01, 2014  
Debt Instrument, Maturity Date [1]       Apr. 01, 2022  
Debt Instrument, Interest Rate, Stated Percentage [1] 4.90%     4.90%  
Debt and Capital Lease Obligations $ 844     $ 844 842
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.40% [Member]          
Debt Instrument [Line Items]          
Original issue date       Feb. 01, 2016  
Debt Instrument, Maturity Date [1]       Feb. 15, 2021  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.40%     3.40%  
Debt and Capital Lease Obligations $ 850     $ 850 850
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 3.7% [Member]          
Debt Instrument [Line Items]          
Original issue date       May 01, 2016  
Debt Instrument, Maturity Date [1]       Jun. 15, 2026  
Debt Instrument, Interest Rate, Stated Percentage [1] 3.70%     3.70%  
Debt and Capital Lease Obligations $ 743     $ 743 743
High Yield Bonds [Member] | Senior Unsecured 2016 Notes 4.450% [Member]          
Debt Instrument [Line Items]          
Original issue date       Feb. 01, 2016  
Debt Instrument, Maturity Date [1]       Feb. 15, 2026  
Debt Instrument, Interest Rate, Stated Percentage [1] 4.50%     4.50%  
Debt and Capital Lease Obligations $ 892     $ 892 $ 891
[1] See the 2017 Form 10-K, including note 8, for additional information regarding the maturity and principal amortization provisions and interest rates relating to the Company's indebtedness.
[2] In June 2018, the Company entered into an amendment to the Credit Facility to (1) increase commitments on the 2016 Revolver by $750 million, for total 2016 Revolver commitments of $4.25 billion, and (2) extend the maturity of the Credit Facility from August 2022 to June 2023.
[3] As of September 30, 2018, the undrawn availability under the 2016 Revolver was $3.4 billion.
[4] In January 2018, the Company issued $750 million aggregate principal amount of 3.150% senior unsecured notes due July 2023 ("3.15% Senior Notes") and $1.0 billion aggregate principal amount of 3.800% senior unsecured notes due February 2028 ("3.80% Senior Notes") (collectively, "January 2018 Senior Notes Offering"). The Company used the net proceeds of the January 2018 Senior Notes Offering to repay (1) in full the January 2010 Tower Revenue Notes and (2) a portion of the outstanding borrowings under the 2016 Revolver.
[5] If the respective series of such debt is not paid in full on or prior to an applicable 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 additional interest (of an additional approximately 5% per annum) will accrue on the respective series. See the 2017 Form 10-K for additional information regarding these provisions.
[6] In July 2018, the Company issued $1.0 billion aggregate principal amount of Senior Secured Tower Revenue Notes ("July 2018 Tower Revenue Notes"), which were issued pursuant to the existing indenture and have similar terms and security as the Company's existing Tower Revenue Notes. The July 2018 Tower Revenue Notes consist of (1) $250 million aggregate principal amount of 3.720% senior secured tower revenue notes ("3.72% Notes") with an anticipated repayment date of July 2023 and a final maturity of July 2043 and (2) $750 million aggregate principal amount of 4.241% senior secured tower revenue notes ("4.241% Notes") with an anticipated repayment date of July 2028 and a final maturity of July 2048. The Company used the net proceeds of the July 2018 Tower Revenue Notes, together with cash on hand, to repay all of the previously outstanding Tower Revenue Notes, Series 2010-6 and to pay related fees and expenses. In addition to the July 2018 Tower Revenue Notes described above, in connection with Exchange Act risk retention requirements ("Risk Retention Rules"), an indirect subsidiary of the Company issued and a majority-owned affiliate of the Company purchased approximately $53 million of the Senior Secured Tower Revenue Notes, Series 2018-1, Class R-2028 to retain an eligible horizontal residual interest (as defined in the Risk Retention Rules) in an amount equal to at least 5% of the fair value of the July 2018 Tower Revenue Notes.