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Operating Segments Operating Segments Table (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]          
Tower Count 40,000   40,000    
Segment site rental revenues $ 1,169 $ 869 $ 2,323 $ 1,726  
Segment network services and other revenues $ 161 169 $ 307 328  
Fiber Miles 60,000   60,000    
Segment revenues $ 1,330 1,038 $ 2,630 2,054  
Segment site rental cost of operations [1] 355 269 702 534  
Segment network services and other cost of operations [1] 99 104 185 203  
Segment general and administrative expenses 138 98 273 199  
Stock-based compensation expense     47 45  
Depreciation, Amortization and Accretion, Net 379 296 753 584  
Interest expense and amortization of deferred financing costs 158 142 318 276  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 185 117 303 240  
Capital expenditures     763 563  
Total Assets 32,374   32,374   $ 32,229
Amortization of prepaid lease purchase price adjustments 5   10    
Segment cost of operations share-based compensation [Member]          
Segment Reporting Information [Line Items]          
Stock-based compensation expense 6 2 13 6  
Towers [Member]          
Segment Reporting Information [Line Items]          
Segment site rental revenues 771 718 1,536 1,434  
Segment network services and other revenues 158 158 300 308  
Segment revenues 929 876 1,836 1,742  
Segment site rental cost of operations 216 211 427 420  
Segment network services and other cost of operations 94 96 176 185  
Segment cost of operations [2] 310 307 603 605  
Segment site rental gross margin 555 507 1,109 1,014  
Segment network services gross margin 64 62 124 123  
Segment general and administrative expenses [2] 27 23 53 47  
Segment Operating Profit 592 546 1,180 1,090  
Capital expenditures 98 107 195 208  
Total Assets 17,780 18,208 17,780 18,208  
Small Cells [Member]          
Segment Reporting Information [Line Items]          
Segment site rental revenues 398 151 787 292  
Segment network services and other revenues 3 11 7 20  
Segment revenues 401 162 794 312  
Segment site rental cost of operations 130 52 256 99  
Segment network services and other cost of operations 3 8 5 17  
Segment cost of operations [2] 133 60 261 116  
Segment site rental gross margin 268 99 531 193  
Segment network services gross margin 0 3 2 3  
Segment general and administrative expenses [2] 44 19 87 36  
Segment Operating Profit 224 83 446 160  
Capital expenditures 289 188 552 342  
Total Assets 14,100 5,811 14,100 5,811  
Consolidated Total [Member]          
Segment Reporting Information [Line Items]          
Segment site rental revenues 1,169 869 2,323 1,726  
Segment network services and other revenues 161 169 307 328  
Segment revenues 1,330 1,038 2,630 2,054  
Segment site rental cost of operations 346 263 683 519  
Segment network services and other cost of operations 97 104 181 202  
Segment cost of operations [2] 443 367 864 721  
Segment site rental gross margin 823 606 1,640 1,207  
Segment network services gross margin 64 65 126 126  
Segment general and administrative expenses [2] 71 42 140 83  
Segment Operating Profit 816 629 1,626 1,250  
Stock-based compensation expense 26 17 52 42  
Depreciation, Amortization and Accretion, Net 379 296 753 584  
Interest expense and amortization of deferred financing costs 158 142 318 276  
Other expenses to reconcile to income (loss) from continuing operations before income taxes 21 16 106 28  
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest 185 117 303 240  
Capital expenditures 393 301 763 563  
Total Assets 32,374 24,484 32,374 24,484  
Other [Member]          
Segment Reporting Information [Line Items]          
Segment general and administrative expenses 47 [2]   94 [2] 80  
Segment Operating Profit      
Stock-based compensation expense 26   52 42  
Depreciation, Amortization and Accretion, Net 379   753 584  
Interest expense and amortization of deferred financing costs 158   318 276  
Other expenses to reconcile to income (loss) from continuing operations before income taxes 21   106 28  
Capital expenditures 6 6 16 13  
Total Assets 494 465 494 465  
Segment G&A share-based compensation [Member]          
Segment Reporting Information [Line Items]          
Stock-based compensation expense $ 20 $ 15 $ 39 $ 36  
[1] Exclusive of depreciation, amortization and accretion shown separately.
[2] Segment cost of operations excludes (1) stock-based compensation expense of $6 million and $2 million for the three months ended June 30, 2018 and 2017, respectively, and (2) prepaid lease purchase price adjustments of $5 million for both of the three months ended June 30, 2018 and 2017. General and administrative expenses exclude stock-based compensation expense of $20 million and $15 million for the three months ended June 30, 2018 and 2017, respectively.