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Debt and Other Obligations (Textuals) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2012
Debt Instrument [Line Items]              
Debt Instrument, Face Amount             $ 1,650
Extinguishment of Debt, Amount $ 12 $ 2,250 $ 0        
Debt Instrument, Interest Rate, Stated Percentage             5.25%
Debt and Lease Obligation $ 18,121 16,682          
Tower Revenue Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Increase (Decrease) 5.00%            
4.875% Senior Notes [Member]              
Debt Instrument [Line Items]              
Proceeds from Issuance of Debt         $ 839    
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            
Secured Debt [Member]              
Debt Instrument [Line Items]              
Debt and Lease Obligation $ 3,271 3,283          
Secured Debt [Member] | January 2010 Tower Revenue Notes [Member]              
Debt Instrument [Line Items]              
Repayments of Debt         300    
Secured Debt [Member] | 2.381% Secured Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Interest Rate, Stated Percentage       2.381%      
Repayments of Debt       $ 500      
Secured Debt [Member] | 3.849% Secured Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount             $ 1,000
Debt Instrument, Interest Rate, Stated Percentage 3.90% [1]           3.849%
Debt and Lease Obligation $ 995 994          
Secured Debt [Member] | July 2018 Tower Revenue Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   1,000          
Secured Debt [Member] | 2018 Tower Revenue Notes 3.720% due 2043 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 250          
Debt Instrument, Interest Rate, Stated Percentage 3.70% [1] 3.72%          
Debt and Lease Obligation [2],[3] $ 248 $ 247          
Secured Debt [Member] | 2018 Tower Revenue Notes 4.241% due 2048 [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 750          
Debt Instrument, Interest Rate, Stated Percentage 4.20% [1] 4.241%          
Debt and Lease Obligation [2],[3] $ 742 $ 742          
Secured Debt [Member] | 2018 Tower Revenue Notes Risk Retention Tranche [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   53          
Bank Debt [Member] | 2016 Revolver [Member]              
Debt Instrument [Line Items]              
Line of Credit Facility, Increase (Decrease), Net 750 750 1,000        
Line of Credit Facility, Maximum Borrowing Capacity $ 5,000 4,250 3,500 2,500      
Extinguishment of Debt, Amount       500      
Debt Instrument, Interest Rate, Stated Percentage [1],[4] 2.80%            
Debt and Lease Obligation $ 525 [5] 1,075          
Bank Debt [Member] | 2016 Term Loan A [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       2,000      
Debt Instrument, Interest Rate, Stated Percentage [1],[4] 2.90%            
Debt and Lease Obligation $ 2,310 2,354          
Bank Debt [Member] | Senior Unsecured 364-Day Revolving Credit Facility [Domain]              
Debt Instrument [Line Items]              
Line of Credit Facility, Maximum Borrowing Capacity       1,000      
Commercial Paper [Member]              
Debt Instrument [Line Items]              
Commercial Paper - Maximum Issued 1,000            
Commercial Paper 155            
Debt and Lease Obligation [6],[7] $ 155 0          
Bonds [Member] | May 2016 Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       1,000      
Bonds [Member] | 4.875% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount         $ 850    
Debt Instrument, Interest Rate, Stated Percentage 4.90% [1]       4.875%    
Debt and Lease Obligation $ 846 844          
Bonds [Member] | 4.000% Senior Unsecured Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount     $ 500        
Debt Instrument, Interest Rate, Stated Percentage 4.00% [1]   4.00%        
Debt and Lease Obligation $ 495 494          
Bonds [Member] | 2016 Senior Unsecured Notes [Domain]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       1,500      
Bonds [Member] | 3.400% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       $ 250      
Debt Instrument, Interest Rate, Stated Percentage       3.40%      
Bonds [Member] | 3.700% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       $ 750      
Debt Instrument, Interest Rate, Stated Percentage       3.70%      
Bonds [Member] | 2.250% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       $ 700      
Debt Instrument, Interest Rate, Stated Percentage 2.30% [1]     2.25%      
Debt and Lease Obligation $ 698 697          
Bonds [Member] | 4.450% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       $ 900      
Debt Instrument, Interest Rate, Stated Percentage       4.45%      
Bonds [Member] | 4.750% Senior Unsecured Notes [Member] [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount     $ 350        
Debt Instrument, Interest Rate, Stated Percentage 4.80% [1]   4.75%        
Debt and Lease Obligation $ 344 343          
Bonds [Member] | August 2017 Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount     $ 1,750        
Bonds [Member] | August 2017 Senior Unsecured 3.200% Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount     $ 750        
Debt Instrument, Interest Rate, Stated Percentage 3.20% [1]   3.20%        
Debt and Lease Obligation $ 744 743          
Bonds [Member] | August 2017 Senior Unsecured 3.650% Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount     $ 1,000        
Debt Instrument, Interest Rate, Stated Percentage 3.70% [1]   3.65%        
Debt and Lease Obligation $ 993 992          
Bonds [Member] | 3.150% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 750          
Debt Instrument, Interest Rate, Stated Percentage 3.20% [1] 3.15%          
Debt and Lease Obligation $ 744 $ 742          
Bonds [Member] | 3.800% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount   $ 1,000          
Debt Instrument, Interest Rate, Stated Percentage 3.80% [1] 3.80%          
Debt and Lease Obligation $ 990 $ 988          
Bonds [Member] | August 2019 Senior Notes [Domain]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount 900            
Bonds [Member] | August 2019 Senior Unsecured 3.100% Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount $ 550            
Debt Instrument, Interest Rate, Stated Percentage [1] 3.10%            
Debt and Lease Obligation $ 543 0          
Bonds [Member] | August 2019 Senior Unsecured 4.000% Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount $ 350            
Debt Instrument, Interest Rate, Stated Percentage [1] 4.00%            
Debt and Lease Obligation $ 345 0          
Bonds [Member] | February 2019 Senior Notes [Domain]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount 1,000            
Bonds [Member] | February 2019 Senior Unsecured 4.300% Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount $ 600            
Debt Instrument, Interest Rate, Stated Percentage [1] 4.30%            
Debt and Lease Obligation $ 592 0          
Bonds [Member] | February 2019 Senior Unsecured 5.200% Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount $ 400            
Debt Instrument, Interest Rate, Stated Percentage [1] 5.20%            
Debt and Lease Obligation $ 395 $ 0          
August 2010 Tower Revenue Notes ARD [Domain] | Secured Debt [Member] | Fixed Rate Securitized Debt August 2010 Tower Revenue Notes 5 [Member]              
Debt Instrument [Line Items]              
Debt and Lease Obligation           $ 250  
Collateral Pledged [Member]              
Debt Instrument [Line Items]              
Debt Instrument, PPE Collaterized Amount $ 1,000            
Additional Principal Incurred [Member] | Bank Debt [Member] | 2016 Term Loan A [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount     $ 500        
February 2016 Senior Note Upsizing [Member] | Bonds [Member] | 3.400% Senior Notes [Member]              
Debt Instrument [Line Items]              
Debt Instrument, Face Amount       $ 600      
Debt Instrument, Interest Rate, Stated Percentage       3.40%      
[1]
Represents the weighted-average stated interest rate.
[2]
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 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, 2019, 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.
[3]
The Tower Revenue Notes, Series 2015-1 and 2015-2 ("May 2015 Tower Revenue Notes") and Tower Revenue Notes, Series 2018-1 and 2018-2 ("July 2018 Tower Revenue Notes") are collectively referred to herein as "Tower Revenue Notes."
[4]
Both the 2016 Revolver and senior unsecured term loan A facility ("2016 Term Loan A") bear interest at a rate per annum equal to LIBOR plus a credit spread ranging from 1.000% to 1.750%, 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 December 31, 2019, the undrawn availability under the 2016 Revolver was $4.5 billion.
[6]
The weighted-average interest rate for the outstanding commercial paper under the CP Program, as defined below, was 2.1%.
[7] 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.